spau 331 c voltage relay - abb€¦ · u3 unoccupied module place u4 output relay module sptr 6b3...

U aux

Ser.No.

80...265 V

18...80 V

2

5

~–

U1 U2 U3

–

fn= 50Hz

60Hz ( U )

SPAU 331 C

0076

B

nU /= ( U )100V 110V

nU /= 100V 110V 0

RS 613

SGR

0 1

12345678

0 0 0 0

SPCU 1C6

12345

n )(U o>

/ >tt %[ ]>>/tt %[ ]

/ nU Uo %[ ]

>>n )(U o

0 0 00

SPCU 3C15

12345678

/ <tt %[ ]

n )(U </ nU Umin

/ nU U<

/ nU Umax

n )( U <<3

/tt %[ ]<<

/ nU U<<3

0 0 00

2nU

>U o [ ]%

[ ]s>t0.05 1.0

>>

nUUo [ ]%

[ ]s>>t

RESET

STEP

U o IRF

U

20

STEP

SG1

12345678

10 ∞

0 1

0.5

1.0oU U o >>>

SPCU 1C6

0008

A

0.05

0.5

50

10

80

nUU<

0.1 1.0

nU

RESET

STEP

IRF

STEP

SG1

12345678

0 1

0.5

1.0

SPCU 3C15

0.1

0.5

0.4 1.2

0.8

U12 U23 U31

U<3U<<

k<

3U<<

1.20.1

0.6

U<<U<

[ ]s<t

[ ]s>t

0412

A

0061

A

SPC 000

SPAU 331 CVoltage relay

User´s manual and Technical description

2

1MRS 750123-MUM EN

Issued 1996-12-02Modified 2002-04-26Version B (replaces 34 SPAU 12 EN1)Checked MKApproved OL

Data subject to change without notice

SPAU 331 CVoltage relay

Contents Features .......................................................................................................................... 3Application ..................................................................................................................... 3Description of operation ................................................................................................. 4Connections ................................................................................................................... 5Operation indicators and push-buttons .......................................................................... 8Signal flow diagram and configuration switches .............................................................. 9Power supply module .................................................................................................... 11Output relay module .................................................................................................... 12Technical data (modified 2002-04) ................................................................................ 13Maintenance and repair ................................................................................................ 16Spare parts .................................................................................................................... 16Delivery alternatives ..................................................................................................... 16Dimension drawings and mounting.............................................................................. 17Order numbers and ordering information .................................................................... 18

The complete manual for the voltage relay SPAU 331 C includes the following submanuals:

Voltage relay SPAU 331 C, general description ........................ 1MRS 750123-MUM ENResidual overvoltage relay module SPCU 1C6 ........................ 1MRS 750509-MUM ENUndervoltage relay module SPCU 3C15 ................................. 1MRS 750588-MUM ENGeneral characteristics of C type relay modules ....................... 1MRS 750328-MUM EN

3

Features Two-stage residual overvoltage relay modulecontaining a low-set residual overvoltage stageU0> and a high-set residual overvoltage stageU0>>

Both residual overvoltage stages feature definitetime characteristic and wide setting ranges

Two-stage undervoltage relay module containinga higher under voltage stage U< and a lowerundervoltage stage 3U<<

The three-phase undervoltage stage U< starts ifone or more of the phase-to-phase voltages fallbelow the set start level

The three-phase under voltage stage 3U<< startsif all three phase-to-phase voltages fall below theset start level

The under voltage stage U< can be given defi-nite time characteristic or inverse time charac-teristic while the under voltage stage 3U<< fea-tures definite time characteristic only

Numerical display of setting values, currentlymeasured values, fault values, operate times,event messages etc.

Serial interface for connection of the relay tothe serial bus and a substation level communi-cation and reporting system and/or a remotecontrol system

High system reliability and availability throughintegrated self-supervision system with auto-diagnostics capabilities in the relay modules

The voltage relay SPAU 331 C is intended forthe supervision of the bus bar voltages of distri-bution substations, both the residual voltage andthe phase-to-phase voltages. The complete volt-age relay contains two protection relay modules.The residual voltage is measured with a residualovervoltage relay module type SPAU 1C6 in-cluding two operation stages. The phase-to-phase voltage is measured with an undervoltagerelay module type SPCU 3C15.

The voltage relay SPAU 331 C is a member ofthe SPACOM product family and as such it isprovided with a serial communication port.Over the serial communication port and anoptional bus connection module of the SPA-ZC_ series the relay can be connected to theoptical fibre SPA bus and further to a substa-tion level data communication and reportingsystem and/or a remote control system.

Application

4

Description ofoperation

When the residual voltage of the monitorednetwork exceeds the set start level of the low-setresidual overvoltage stage U0> the relay mod-ule SPCU 1C6 starts. If the fault persists theU0> stage trips after the set operate time t> haselapsed. Correspondingly, the high-set residualovervoltage stage U0>> starts when its set startlevel is exceeded and trips when its set operatetime t>> has elapsed.

When one of the phase-to-phase voltages of themonitored network falls below the set start levelof the undervoltage stage U<, the relay moduleSPCU 3C15 starts. If the undervoltage situa-tion persists the U< stage trips after the set (atdefinite time mode) or calculated (at inversetime mode) operate time t< has elapsed. Corre-spondingly, the under voltage stage 3U<< startswhen all three phase-to-phase voltages simulta-neously fall below the set start level and tripswhen its set operate time t<< has elapsed.

The operation of the undervoltage stage U< canbe given inverse time characteristic or definitetime characteristic. At inverse time characteris-

tic the operate time is a function of the meas-ured voltage and the set time multplier k andthe operate time is shorter the lower the meas-ured voltage. The undervoltage stage 3U<< fea-tures definite time characteristic only.

By turning switch SG1/5 on the front panel ofthe undervoltage relay module SPCU 3C15 inposition 1, the operation of the undervoltagestage U< can be blocked, when at least one ofthe measured phase-to-phase voltages falls be-low 0.2 x Un. Further, the operation of the un-dervoltage stage U< can be blocked by the startsignal of the undervoltage stage 3U<<, switchSG1/8 in position 1.

Tripping of both operation stages of the under-voltage relay module and the residual voltagerelay module can be blocked by means of anexternal control signal applied to the controlinput 10-11 of the relay. The operation stagesto be blocked are selected with switches 4 and 5of switch group SGB in the relay modules re-spectively, see section "Signal flow diagram".

Fig. 1. Operation diagram for the undervoltage relay module SPCU 3C15 when selector switchSG1/5 = 1, i.e. starting of the undervoltage stage is blocked at voltage levels under 0.2 x Un.

U</Un Set start level of the undervoltage stage U<SS1 Start signal of the undervoltage stage U<TS1 Trip signal of the undervoltage stage U<

5

Connections

Fig. 2. Connection diagram for the voltage relay SPAU 331 C.

Uaux Auxiliary supply voltageA, B…F Output relaysIRF Self-supervision alarmSGR Switchgroup for programming of starting and tripping signalsU1 Residual overvoltage relay module SPCU 1 C6U2 Undervoltage relay module SPCU 3C15U3 Unoccupied module placeU4 Output relay module SPTR 6B3U5 Power supply module SPGU 240A1 or SPGU 48B2U6 Energizing input module SPTE 4B9SPA-ZC_ Bus connection moduleRx/Tx Optical fibre receiver (Rx) and transmitter (Tx) of the bus connection module

6

Fig. 3. Rear wiew of the voltage relay SPAU 331 C.

7

Specification of input and output terminals

Terminal Functionnumber

13-14 Phase-to-phase voltage U12 (100 V)13-15 Phase-to-phase voltage U12 (110V)16-17 Phase-to-phase voltage U23 (100 V)16-18 Phase-to-phase voltage U23 (110 V)19-20 Phase-to-phase voltage U31 (100 V)19-21 Phase-to-phase voltage U31 (110 V)28-29 Residual voltage U0 (100 V)28-30 Residual voltage U0 (110V)

10-11 External blocking signal BS1

61-62 Auxiliary supply voltage. The positive pole (+) of the DC supply is connected toterminal 61. The auxiliary supply voltage range is marked on the system front plateof the relay.

63 Protection earth (PE)

65-66 Tripping output relay A (heavy-duty) for all stages, U0>, U0>>, U< and 3U<<

67-68-69 Alarm signal output relay B for stages stages U0>>, U< and 3U<<73-74-75 Alarm and start signal output relay C for stage U<76-77-78 Alarm and start signal output relay D for stage 3U<<79-80-81 Alarm signal output relay E for stage U0>70-71 -72 Self-supervision output relay F. In normal service conditions the contact gap 70-72

is closed. In a fault situation the contact gap 71-72 closes.

NOTE!Detailed information about the programming of starting and tripping signals inswitchgroups SGB and SGR is given in the section "Signal flow diagram andconficuration switches".

The voltage relay SPAU 331 C can be connectedto the optical fibre SPA data bus by means of a9-pole D type connector located on the rearpanel of the voltage relay, and a matching busconnection module type SPA-ZC_. The opto-

connectors of the optical fibres are blugged intothe counter connectors Rx and Tx of the busconnection module and the optical fibres arelinked from one protection relay to another andto the control data communicator.

8

Fig. 4. System front panel of the voltage relaySPAU 331 C.

1. The green LED Uaux on the system panel islit when the power supply of the relay is op-erating.

2. The relay modules are provided with twooperating stages and each stage has its ownyellow/red LED operation indicator. The op-eration indicator goes on with a yellow lightwhen the operation stage starts and with ared light if the stage delivers a tripping signalas well. The LED indicators can be given self-reset or manual reset mode of operation. Nor-mally, when the stage resets, the red opera-tion indicator remains lit after being switchedon to indicate by whitch stage the trippingwas initiated.

3. The front panels of both relay modules areprovided with a numerical display for indi-cation of measured and set values, two push-buttons marked STEP and RESET, a pro-gramming switchgroup SG1 for selection ofrelay functions and four setting knobs for op-eration values. The STEP push-button canbe used for scanning through the measuredand set values of the module and for presen-tation of the values concerned on the displayof the module. The RESET push-button isused for resetting locally the red operationindicators for tripping. An unreset operationindicator does not affect the operation of therelay module and thus, the module isconstantely operative.

4. The front panels of the relay modules are pro-vided with a red LED used as a self-supervi-sion alarm indicator IRF which indicates thatthe self-supervision system has detected a per-manent fault in the protection relay. Further,the relay modules are provided with separateLED indicators on the front panel for indi-cation of the measured residual and phase-to-phase voltages.

5. The cover of the protection relay case is madeof transparent, UV-stabilized polycarbonatepolymer and provided with three push-but-tons for scanning of the relay parameters bymeans of the separate displays of the mod-ules and the STEP push-buttons inside thecover. To enable resetting of the modules bymeans of the RESET push-buttons, the coverof the relay case must be opened using thelocking screws for the case.

Detailed operation instructions are given in themanuals describing the individual relay mod-ules and in the document "General characteris-tics of C-type relay modules".

Operationindicators andpush-buttons

U aux

Ser.No.

80...265 V

18...80 V

2

5

~–

U1 U2 U3

–

fn= 50Hz

60Hz ( U )

SPAU 331 C

0076

B

nU /= ( U )100V 110V

nU /= 100V 110V 0

RS 613

SGR

0 1

12345678

0 0 0 0

SPCU 1C6

12345

n )(U o>

/ >tt %[ ]>>/tt %[ ]

/ nU Uo %[ ]

>>n )(U o

0 0 00

SPCU 3C15

12345678

/ <tt %[ ]

n )(U </ nU Umin

/ nU U<

/ nU Umax

n )( U <<3

/tt %[ ]<<

/ nU U<<3

0 0 00

9

Signal flowdiagram andconfigurationswitches

In certain applications it may be necessary toalter the factory settings of the configurationswitches of the relay SPAU 331 C. Fig. 5 illus-trates schematically how the starting, tripping,

control and blocking signals can be routed in-side the relay to obtain the protection functionsrequired by the intended application.

Fig. 5. Control signal routes between the relay modules of the voltage relay SPAU 331 C.

BS

1

Uo

23

45

67

81

Uo>

Uo>

>

t>t>

>

TS

1T

S2

23

45

67

81

t<

SS

1S

S2

TS

1T

S2

U<

k<

3U<

<

t<<

SG

BS

GB

SPCU 1C6 (U1)

SPCU 3C15 (U2)

SPC 000 (U3)

SG

R

1 2 3 4 5 6 7 8

B C D EA

U12

,U

23,

U31

10

Configurationswitches

Part of the starting and tripping signals fromthe relay modules are permanently connectedto the output relays, whereas part of the outputsignals are routed through switchgroup SGR.The switchgroup is located at the front edge ofthe output relay module. The switches are setthrough the opening in the relay system frontpanel.

The switchgroups SGB on the PC-boards of therelay modules SPCU 1C6 and SPCU 3C15 areused for routing incoming external blocking sig-nals to the protection stages to be blocked.

The functions of the switchgroups SGB andSGR are described in the tables as follows:

Switchgroup SGR on relay system panel

Switch Function Factorysetting

SGR/1 Tripping signal from stage U< to output relay A 1SGR/2 Tripping signal from stage 3U<< to output relay A 1SGR/3 Tripping signal from stage U0> to output relay A 1SGR/4 Tripping signal from stage U0>> to output relay A 1SGR/5 Tripping signal from stage U< to output relay B 1SGR/6 Tripping signal from stage 3U<< to output relay B 1SGR/7 Starting signal from stage U< to output relay C 1SGR/8 Starting signal from stage 3U<< to output relay D 1

Switchgroup SGB on PC-board in residual overvoltage relay module SPCU 1C6


SGB/1 Not in use 0SGB/2 Not in use 0SGB/3 Not in use 0SGB/4 Blocking signal BS1 for blocking of U0>-tripping 0SGB/5 Blocking signal BS1 for blocking of U0>>-tripping 0SGB/6 Not in use 0SGB/7 Not in use 0SGB/8 Not in use 0

Switchgroup SGB on PC-board in undervoltage relay module SPCU 3C15


SGB/1 Not in use 0SGB/2 Not in use 0SGB/3 Not in use 0SGB/4 Blocking signal BS1 for blocking of U<-tripping 0SGB/5 Blocking signal BS1 for blocking of 3U<<-tripping 0SGB/6 Not in use 0SGB/7 Not in use 0SGB/8 Not in use 0

11

Power supplymodule

The power supply module is located behind thesystem front panel of the relay together withthe output relay module. The supply module isa separate relay module and can be withdrawnafter removal of the system front panel. Thepower supply module produces the voltages re-quired by the relay modules from the auxiliarysupply voltage.

There are two types of power supply modules,differing only in input voltage:

SPGU 240 A1:Nominal voltage Un = 110/120/230/240 V ac

Un = 110/125/220 V dcOperative range U = 80...265 V ac/dc

SPGU 48 B2:Nominal voltage Un = 24/48/60 V dcOperative range U = 18...80 V dc

The power supply type is marked on the systemfront panel.

The power supply module is a transformer con-nected, i.e. galvanically separated primary andsecondary circuits, flyback type rectifier. Theprimary circuit is protected by a fuse F1, 1A(slow) in SPGU 240 A1 and 4A (fast) in SPGU48 B2, which are located on the printed circuitboard of the module.

When the power supply is on, a green LED in-dicator Uaux is lit on the system panel. The su-pervision of the supply voltages for the electron-ics is located on the regulating modules. Theself-supervision alarm is given if any of the sec-ondary voltages differ more than 25% from thenominal value. Also, if the power supply mod-ule is missing, or if there is no auxiliary supplyto the voltage regulator at all, an alarm is given.

12

Output relaymodule

The output relay module SPTR 6B3 is locatedbehind the system front panel of the relay to-gether with the power supply module. The out-put relay module forms its own withdrawablerelay module after removal of the system front

plate. The module contains all output relays,A...F, the control circuits of the relays as well asthe electronic circuitry of the external controlinputs.

Fig. 6. Block diagram for the output relay module SPTR 6B3.

TS1/U1 Tripping signal of U0>-stageTS2/U1 Tripping signal of U0>>-stageSS1/U2 Starting signal of U>-stageTS1/U2 Tripping signal of U>-stageSS2/U2 Starting signal of U<-stageTS2/U2 Tripping signal of U<-stageBS1 External blocking input signal to U<-stageA Tripping output relay A (heavy-duty) for all stages, U0>, U0>>, U> and U<B Alarm signal output relay B for stages U0>>, U> and U<C Alarm signal output relay C for stage U>D Alarm signal output relay D for stage U<E Alarm signal output relay E for stage U0>F Self-supervision output relay FIRF Self-supervision input signalSGR Switchgroup for programming of starting and tripping signalsENA Enable output signal from control circuits

The input and output signals of the output re-lay module are related to the fixed positions ofthe relay modules which cannot be changed inthe relay housing. The output signals from eachrelay module and PC-board location are wiredindividually to the output relay module. It must

be pointed out that the relay modules have tobe plugged into the relay case as illustrated inthe figure on the front page in order to securethat the connection diagram drawn for the re-lay assembly also would correspond to the physi-cal function of the protective device.

13

Technical data(modified 2002-04)

Energizing inputsRated voltage Un 100 V 110 VTerminal numbers- phase-to-phase voltage U12 13-14 13-15- phase-to-phase voltage U23 16-17 16-18- phase-to-phase voltage U31 19-20 19-21- residual voltage U0 28-29 28-30Continuous voltage withstand 2 x UnBurden at rated voltage Un <0.5 VARated frequency fn, according to order 50 Hz or 60 Hz

External control inputsTerminal numbers 10-11External control voltage 18...265 V dc or 80...265 V acCurrent drain, typically 2...15 mA

Contact outputsTripping outputsTerminal numbers- trip relay A 65-66Rated voltage 250 V dc/acContinuous current carrying capacity 5 AMake and carry for 0.5 s 30 AMake and carry for 3 s 15 ABreaking capacity for dc when the control circuittime constant L/R ≤40 ms at 48/110/220 V dc 5A /3A /1 A

Signalling outputsTerminal numbers- alarm relay B 67-68-69- alarm relay C 73-74-75- alarm relay D 76-77-78- alarm relay E 79-80-81- self-supervision relay F 70-71-72Rated voltage 250 V dc/acContinuous current carrying capacity 5 AMake and carry for 0.5 s 10 AMake and carry for 3 s 8 ABreaking capacity for dc when the control circuittime constant L/R ≤40 ms at 48/110/220 V dc 1A /0.25A /0.25A

Auxiliary power supplyVoltage range of power supply modules:SPGU 240 A1- Nominal voltage Un 110/120/230/240 V ac

110/125/220 V dc- Operative range 80...265 V ac/dcSPGU 48 B2- Nominal voltage Un 24/48/60 V dc- Operative range 18...80 V dcPower consumption under quiescent/operation conditions 10 W / 15 W

14

Residual overvoltage relay module SPCU 1C6See "Technical data" in the document 1MRS 750509-MUM EN for the relay module.

Two-stage undervoltage relay module SPCU 3C15See "Technical data" in the document 1MRS 750588-MUM EN for the relay module.

Data communicationTransmission mode Fibre-optic serial busCoding ASCIIData transfer rate, selectable 300, 1200, 2400, 4800 or 9600 BdOptical bus connection module powered fromthe host relay- for plastic-core cables SPA-ZC 21 BB- for glass-fibre cables SPA-ZC 21 MMOptical bus connection module powered fromthe host relay or from an external power source- for plastic-core cables SPA-ZC 17 BB- for glass-fibre cables SPA-ZC 17 MM

Insulation Tests *)Dielectric test IEC 60255-5 2 kV, 50 Hz, 1 minImpulse voltage test IEC 60255-5 5 kV, 1.2/50 µs, 0.5 JInsulation resistance measurement IEC 60255-5 >100 MΩ, 500 Vdc

Electromagnetic Compatibility Tests *)High-frequency (1 MHz) burst disturbance testIEC 60255-22-1- common mode 2.5 kV- differential mode 1.0 kVElectrostatic discharge test IEC 60255-22-2 andIEC 61000-4-2- contact discharge 6 kV- air discharge 8 kVFast transient disturbance test IEC 60255-22-4and IEC 61000-4-4- power supply 4 kV- I/O ports 2 kV

15

Emission testsRadiated and conducted emission accordingto EN 55011 Class A

EMC testsCE approved and tested according toEN 50081-2 and EN 50082-2

Environmental conditionsService temperature range -10...+55°CTemperature dependence <0.2%/°CTransport and storage temperature rangeaccording to IEC 60068-2-8 -40...+70°CDamp heat test according to IEC 60068-2-30 ≤95%, 55°C, 6 cyclesDegree of protection by enclosure of flush mountingrelay case according to IEC 60529 IP54Weight of fully equipped relay 5.5 kg

*) The tests do not apply to the serial port, which is used exclusively for the bus connection module.

16

Maintenanceand repair

When the voltage relay SPAU 331 C is operat-ing under the conditions specified in "Techni-cal data", the relay requires practically no main-tenance. The voltage relay includes no parts orcomponents that are sensitive to physical or elec-trical wear under normal operating conditions.

Should the temperature and humidity at theoperating site differ from the values specified,or the atmosphere contain chemically activegases or dust, the relay should be visually in-spected in association with the secondary test-ing of the relay. This visual inspection shouldfocus on:

- Signs of mechanical damage to relay case andterminals

- Collection of dust inside the relay case; removewith compressed air

- Signs of corrosion on terminals, case or insidethe relay

If the relay malfunctions or the operating val-ues differ from those specified, the relay shouldbe overhauled. Minor measures can be taken bythe customer but any major repair involving theelectronics has to be carried out by the manu-facturer. Please contact the manufacturer or hisnearest representative for further informationabout checking, overhaul and recalibration ofthe relay.

The protection relay contains circuits sensitiveto electrostatic discharge. If you have to with-draw a relay module, ensure that you are at thesame potential as the module, for instance, bytouching the case.

Note!Protective relays are measuring instruments andshould be handled with care and protectedagainst moisture and mechanical stress, espe-cially during transport.

Spare parts Residual overvoltage relay module SPCU 1C6Two-stage undervoltage relay module SPCU 3C15Power supply modules- Uaux = 80...265 V ac/dc (operative range) SPGU 240 A1- Uaux = 18...80 V dc (operative range) SPGU 48 B2Output relay module SPTR 6B3Interface module SPTE 4B9Case (including connection module) SPTK 4B9Bus connection module SPA-ZC 17_ or SPA-ZC 21_

Deliveryalternatives

Type Equipment SPCU SPCU1C6 3C15

SPAU 331 C1 Basic version, residual voltage and undervoltage module x x

SPAU 331 C3 Basic version, residual voltage module alone x

SPAU 331 C5 Basic version, undervoltage module alone x

Delivery versions of the voltage relay SPAU 331 C.

17

Dimensiondrawingsand mounting

The basic model of the protection relay case isdesigned for flush-mounting. When required,the mounting depth of the case can be reducedby using raising frames: type SPA-ZX 301 re-duces the depth by 40 mm, type SPA-ZX 302

by 80 mm and type SPA-ZX 303 by 120 mm.When projecting mounting is preferred a relaycase type SPA-ZX 306 is used. The relay casefor projecting mounting is provided with frontconnectors.

Raising frame

SPA-ZX 301SPA-ZX 302SPA-ZX 303

219179139

74114154

a b

226

162

136

229

293259

3034

a b

Panel cut-out

214 ±1

139

±1

Fig. 6. Dimension and mounting drawings for overvoltage, undervoltage and residual voltagerelay SPAU 331 C.

The relay case is made of profile aluminium andfinished in beige.

The rubber gasket fitted to the mounting collarprovides an IP54 degree of protection by enclo-sure between the relay case and the mountingbase.

The hinged cover of the case is made of trans-parent, UV-stabilized polycarbonate polymerand provided with two sealable locking screws.The rubber gasket of the cover provides an IP54degree of protection between the case and thecover.

The required input and output connections aremade to the multi-pole terminal blocks on the

rear panel. Each screw terminal is dimensionedfor one or two wires of maximum 2.5 mm2. Aconnection diagram adjacent to the terminalblocks illustrates the connection of the termi-nals.

The 9-pole D-type connector is intended forserial communication of the relay. A 25-pole D-type connector is used for connecting the dis-turbance recorder module via the RS 232 C porton the front panel to an output device.

The bus connection modules (SPA-ZC 17_ orSPA-ZC 21_) and fibre-optic cables recom-mended by the manufacturer should always beused for the serial communication.

18

Order numbersand orderinginformation

Voltage relay

SPAU 331 C1 RS 613 031 - AA, CA, DA, FASPAU 331 C3 RS 613 033 - AA, CA, DA, FASPAU 331 C5 RS 613 035 - AA, CA, DA, FA

The letter combinations of the order number denote the rated frequency fn andthe operative range of the auxiliary supply voltage:

AA: fn = 50 Hz, Uaux = 80...265 V ac/dcCA: fn = 50 Hz, Uaux = 18...80 V dcDA: fn = 60 Hz, Uaux = 80...265 V ac/dcFA: fn = 60 Hz, Uaux = 18...80 V dc

Ordering example:

1. Number and type designation 5 pcs SPAU 331 C12. Order number RS 613 031 - AA3. Rated frequency fn = 50 Hz4. Auxiliary voltage Uaux = 110 V dc5. Accessories 5 raising frames SPA-ZX 301

5 bus connection modules SPA-ZC 17 MM2A6. Special requirements –

IRF

1310

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

>U >>U

SPCU 1C6

B

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

STEP

SPCU 1C6Residual overvoltage relay module


2

SPCU 1C6Residual overvoltage

relay module

Contents Features .......................................................................................................................... 2Description of operation ................................................................................................. 3Block diagram................................................................................................................. 4Front panel ..................................................................................................................... 5Operation indicators ....................................................................................................... 5Settings ........................................................................................................................... 6Selector switches ............................................................................................................. 6Measured data................................................................................................................. 7Recorded information ..................................................................................................... 8Menu chart ..................................................................................................................... 9Technical data ............................................................................................................... 10Serial communication parameters ................................................................................. 11

Event codes .............................................................................................................. 11Data to be transferred over the serial bus ................................................................. 12

Fault codes .................................................................................................................... 15

Features Low-set residual overvoltage stage U0> withdefinite time operation characteristic, settingranges 2...20% x Un and 10...100% x Un

High-set residual overvoltage stage U0>> withdefinite time operation characteristic, settingranges 10...80% x Un or 2...16% x Un

The operation of the high-set residual over-voltage stage can be set out of function by se-lecting the setting ∞, infinitive

Effective suppression of harmonics of the inputenergizing voltages

Local display of measured and set values as wellas data recorded at the moment of a relay op-eration

Flexible selection of special operational featuresfor particular applications

Continuous self-supervision of hardware andsoftware. At a permanent fault the alarm out-put relay picks up and the other outputs areblocked.

1MRS 750509-MUM EN

Issued 96-12-02Version A (replaces 34 SPCU 2 EN1)Checked L-W UApproved TK


3


The residual overvoltage relay module typeSPCU 1C6 is used in a variety of different pro-tection relay units where it constitutes a non-directional general earth-fault protection mod-ule which measures the residual voltage of theelectrical power system.

The residual overvoltage module contains twoovervoltage stages,that is a low-set stage U0> anda high-set stage U0>>.

The low-set or high-set voltage stage starts ifthe measured voltage exceeds the set start valueof the stage concerned. When starting, the con-cerned stage delivers a starting signal SS1 or SS2and simultaneously the operation indicator ofthe stage is lit with yellow colour. If the over-voltage situation lasts long enough to exceed theset operation delay, the stage that started alsooperates generating a trip signal, TS1 alt. TS2.The operation indicator of the stage that oper-ated turns red. The start and operation indica-tors are provided with memory control, whichmeans that they can be given the self-reset orthe latching mode of operation. The latchingindicators are reset with the RESET push-but-ton on the front panel or by means of the com-mand V101 or V102 via the serial port.

The tripping of the low-set overvoltage stageU0> can be blocked by routing a blocking sig-nal BTS1 to the low-set stage. Similarly, the trip-ping of the high-set stage U0>> is blocked by ablocking signal BTS2. The blocking signals arerouted by means of switchgroup SGB on thePC board of the relay module.

The setting range of the operation time t> ofthe low-set overvoltage stage U0> is selected withswitches SG1/1 and SG1/2. Three setting rangesare available.

Switches SG1/7 and SG1/8 are used for select-ing the setting range for the operation time t>>of the high-set stage U0>>. Three setting rangesare available.

The setting range of the start value of the low-set stage U0> is selected with switch SG1/5. Twosetting ranges are available, that is 2...20% x Unand 10...100% x Un.

The setting range of the start value of the high-set stage U0>> is selected with switch SG1/6. Twosetting ranges are available, that is 2...16% x Unor 10...80% x Un.

The operation of the two operating stages isprovided with a so called latching facility, whichmeans that the operation output is kept alerted,although the signal which caused the operationdisappears. The latching function is selectedwith switch SG1/4. The latched output and theoutput relay can be reset in three different ways;(i) by pressing push buttons STEP and RESETsimultaneously, (ii) via the serial inter-face us-ing the command V101 or (iii) via the serialinterface using the command V102. When al-ternative (ii) is used all recorded information ismaintained but if the alternatives (i) or (iii) isused the recorded information is erased.

The residual voltage signal input is providedwith an effective filter by means of whichhamonics of the measured residual voltage issuppressed, see Fig. 1.

dB 10

0

-10

-20

-30

-40

-50

-600 1 2 3 4 5 6 7 f / fn

Fig. 1. Filter characteristics of the residual volt-age input circuit.

4

Block diagram

Fig. 2. Block schematic diagram of the residual overvoltage relay module SPCU 1C6.

U0 Measured residual voltageBS1, BS2, BS3 Incoming external blocking signalsBTS1 Blocking of tripping of stage U0>BTS2 Blocking of tripping of stage U0>>SG1 Selector switchgroup on the relay module front panelSG2 Function selector switchgroup for the operation indicatorsSGB Selector switchgroup on the PC board for blocking signalsSS1 Start signal of stage U0>TS1 Trip signal of stage U0>SS2 Start signal of stage U0>>TS2 Trip signal of stage U0>>Y Yellow indicator, startingR Red indicator, tripping

NOTE!All input and output signals of the relay mod-ule are not necessarily wired to the terminals ofevery protection relay unit utilizing this mod-

ule. The signals wired to the terminals are shownin the signal diagram in the manual of the con-cerned protection relay unit.

5

Front panel

Voltage measurement indicator

Start voltage setting knoband indicator of stage U0>

Operation time setting knoband indicator of stage U0>

Start voltage setting knob andindicator of stage U0>>

Operation time setting knoband indicator of stage U0>>

IRF

1310

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

>U >>U

SPCU 1C6

B

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

STEP

Simplified device symbol

Self-supervision alarmindicator

Display for set andmeasured values

Display step push-button

Selector switchgroup

Switchgroup indicator

Reset push-button

Operation indicators

Relay module typedesignation

Fig. 3. Front panel of the residual overvoltage relay module SPCU 1C6.

Operationindicators

Both voltage stages have their own yellow/redLED indicators. Yellow light indicates startingof the concerned overvoltage stage and red lightindicates that the overvoltage stage has operated.

The four LED indicators can, independently ofone another, be given a non-latching or a latch-ing mode of operation. The latching modemeans that the indicator remains lit after beingswitched on, although the overvoltage stage,which controls the indicator, resets. If, for in-stance, the yellow start indicator is given thelatching mode and the red indicator the non-latching mode, the yellow indicator is lit, whenthe stage starts, which then turns red if and whenthe stage operates. When the overvoltage stageresets only the yellow indicator remains lit. Theindicators, which have been given the latchingmode, are reset locally by pushing the RESETpush-button or by remote control over the SPAbus using the command V102.

An unreset operation indicator does not affectthe protective functions of the relay module.

The self-supervision alarm indicator IRF indi-cates that the self-supervision system has de-tected a permanent internal relay fault. The in-dicator is lit with red light shortly after the faulthas been detected. At the same time the relaymodule puts forward a control signal to the self-supervision system output relay of the protec-tion relay unit.

Additionally, in most fault cases, a fault codeshowing the nature of the fault appears on thedisplay of the module. The fault code, consist-ing of a red number one (1) and a green three-digit code number, indicates what type of in-ternal fault that has been detected. When a faultmessage appears, the fault code should be noteddown for later use when relay overhaul or re-pair is to be carried out.

6

Settings The setting values are shown by the threerightmost digits of the display. A LED indica-

tor below the setting knob shows, when lit,which setting value is presented on the display.

U0>/Un Start voltage value of the U0> stage, expressed as a percentage of the rated voltageof the energizing input used. The setting range is 2...20% x Un when SG1/5 = 0,and 10...100% x Un when SG1/5 = 1.

t> [s] Operate time of the U0> stage, expressed in seconds. The setting range is deter-mined by the position of switches SG1/1 and SG1/2. Selectable operate time set-ting ranges 0.05...1.00 s, 0.5...10.0 s and 5...100 s.

U0>>/Un Start voltage value of the U0>> stage, expressed as a percentage of the rated voltageof the energizing input used. The setting range is 10...80% x Un when SG1/6 = 0,and 2...16% x Un when SG1/6 = 1. The setting ∞, infinite, (displayed as - - -) setsthe high-set stage U0>> out of operation.

t>> [s] Operate time of the U0>> stage, expressed in seconds. The required setting range,0.05...1.00 s, 0.5...10.0 s or 5.00...100 s, is selected with switches SG1/7 andSG1/8.

Further, the checksum of the selector switch-group SG1 is shown on the display when theLED indicator below the switchgroup is lit. Bymeans of the displayed checksum and thechecksum manually calculated the proper op-

eration of the switchgroup SG1 can be verified.An example of how the checksum is calculatedis shown in the manual "General characteristicsof C type relay modules".

Selector switches Additional functions required by individualapplications are selected by means of the func-tion selector switches of switchgroup SG1 lo-cated on the front panel. The numbering of the

switches, 1...8, as well as the switch positions 0and 1 are marked on the relay module frontpanel.

Switch Function

SG1/1 Selection of setting range for the operate time t> of low-set stage U0>.SG1/2

SG1/1 SG1/2 Operate time t>

0 0 0.05...1.00 s1 0 0.5...10.0 s0 1 0.5...10.0 s1 1 5...100 s

SG1/3 Not in use. Has to be set in position 0.

SG1/4 Selection of latching function for the tripping signals TS1 and TS2.

When SG1/4 = 0, the trip signals reset to the initial state (= the output relay drops off ),when the measuring signal causing the operation falls below the set start voltage level.When SG1/4 = 1, the trip signals remain activated (= the output relay remains pickedup), although the measuring signal falls below the set start voltage level. Then the tripsignals are reset by pressing the push-buttons STEP and RESET simultaneously orwith the commands V101 or V102 via the serial port.

SG1/5 Selection of setting range for the start voltage value of the low-set stage U0>.

When SG1/5 = 0, the setting range is 2...20% x Un.When SG1/5 = 1, the setting range is 10...100% x Un.

7

Switch Function

SG1/6 Selection of setting range for the start voltage value of the high-set stage U0>>.

When SG1/6 = 0, the setting range is 10...80% x Un and ∞, infinite.When SG1/6 = 1, the setting range is 2...16% x Un and ∞, infinite.

SG1/7 Selection of setting range for the operate time t>> of the high-set stage U0>>.SG1/8

SG1/7 SG1/8 Operate time t>>

0 0 0.05...1.00 s1 0 0.5...10.0 s0 1 0.5...10.0 s1 1 5...100 s

Switchgroup SG2 is a so called software switch-group, which is located in the third submenuof switchgroup SG1. The mode of operation,i.e. self-reset or manually reset, of the LED in-dicators U0> and U0>> is determined by theswitches of switchgroup SG2. The mode of op-

eration can be separately set for each indicator.The mode of operation is set by means of thechecksum, which can be calculated from thefollowing table. Normally the start indicationsare self-reset and the operation indicationsmanually reset.

Indicator Manually reset Factory default

Start indicator U0> 1 0Operation indicator U0> 2 2Start indicator U0>> 4 0Operation indicator U0>> 8 8

Checksum 15 10

The PC board of the relay module contains aswitchgroup SGB including switches 1...8. Theswitches 1...3 are used for selecting the startingsignals, whereas switches 4...8 are used for rout-ing the blocking signals to the voltage module

in various protection relay units. Instructionsfor setting of switchgroup SGB are given in theuser's manual of the different protection relayunits.

Measured data The measured values are displayed by the threerightmost digits on the display. The measured

data to be displayed are indicated by a lit LEDindicator.

Indicator Measured data

U0 Residual voltage measured by the relay module, expressed as a percentage of therated voltage of the energizing input used.

8

Recordedinformation

The leftmost red digit displays the addressnumber of the register, the rightmost three greendigits display the recorded data.

Register/ Recorded dataSTEP

1 Maximum residual voltage measured by the module, as a percentage of the ratedvoltage Un of the used energizing input. If the module operates, the voltage value atthe moment of operation is stored in the memory. Any new operation erases the oldvalue and updates the register with the new value. The same thing happens if themeasured voltage exceeds a previously recorded maximum value.

2 Number of starts of the low-set overvoltage stage U0>, n (U0>) = 0...255.

3 Number of starts of the high-set overvoltage stage U0>>, n (U0>>) = 0...255.

4 Duration of the latest start situation of stage U0> as a percentage of the set operatetime t>. Any new start resets the counter, which then starts counting from zero.When the stage has operated, the counter reading is 100.

5 Duration of the latest start situation of stage U0>> as a percentage of the set operatetime t>>. Any new start resets the counter, which then starts recounting from zero.When the stage has operated, the counter reading is 100.

0 Display of blocking signals and other external control signals. The rightmost digitindicates the state of the blocking inputs of the relay module. The following statesmay be indicated:0 = no blockings1 = operation of the U0> stage blocked2 = operation of the U0>> stage blocked3 = operation of both stages blocked

In this register the second digit from he right is constantly zero. The leftmost digitindicates the state of the remote reset control input, if applicable. The followingstates may be indicated:0 = remote reset control input not energized1 = remote reset control input energized

From this register it is possible to move on to the TEST mode, where the start andoperation signals of the module can be activated one by one. For further details seemanual "General characteristics of C type relay modules".

A The address code of the protection relay module in the serial communication sys-tem. The serial communication is broken if the relay module is given the addresscode 0 (zero). Register A is provided with the following subregisters:1. Selection of data transfer rate for the serial communication. Selectable values

300, 1200, 2400, 4800 and 9600 Bd. Default value 9600 Bd.2. Bus communication monitor. If the relay module is connected to a serial com-

munication system and the serial communication system is in operation the coun-ter of the bus communication monitor will show the value 0 (zero). If the com-munication is broken the numbers 0…255 are scrolling in the counter.

3. Password required when changing relay module settings via remote control

Registers 1...5 are set to zero by pressing thepush buttons STEP and RESET simultaneouslyor by remote control using the command V102.The register values are also erased if the auxil-iary power supply of the module is interrupted.The address code of the relay module, the set

data transfer rate of the serial communicationand the password are not erased by a supplyvoltage interruption. Instructions for setting theaddress code and the data transfer rate are givenin the manual "General characteristics of C typerelay modules".

9

Menu chart

Display off. Normal state SUBMENUFORWARD STEP 1 sBACKWARD STEP 0.5 s

MAIN MENU

STEP

BACKWARD

.5s

STEP FORWARD

1s

MAIN MENU SUBMENU

STEP 0.5 s RESET 1 s

0 000 SS1 TS1 TS2IRF SS2

Residual voltage U

Remotely setpercentage p1

Alerted start voltage, stage

Remotely set startvoltage x p1


Alerted operation time t>, stage

Remotely set ope-ration time t> x p2


Alerted start voltage, stage

Remotely set start voltage x p3


Alerted operation time t>>, stage

Remotely set ope-ration time t>> x p4

Alerted checksum,switchgroup SG1

Remotely set checksum of SG1

Remotely set checksum of SG1

Chechsumof SG2

Recorded maximum value of the residual voltage

Number of starts of the residual voltage stage

Number of starts of the residual voltage stage

Duration of the latest start event stage

1

2

3

4

Duration of the latest start event of stage 5

Incoming blocking signals0

Relay module address code

Data transfer rate (Bd)

Bus communication monitor 0 ... 255 Password A

= Value that can be set in the setting mode0

U >0

U >>0

U >0

U >>0

U 0

U >0

U >>0

U >0

U >>0

U >>0

U >0

Fig. 4. Main menu and submenus of the residual overvoltage relay module SPCU 1C6.

The procedure for entering a submenu or a set-ting mode and configuring the module is de-

scribed in detail in "General characteristics ofC type relay modules".

10

Technical data Low-set overvoltage stage U0>Start voltage U0> 2...20% x Un or 10...100% x UnStart time, typically 70 msOperate time 0.05...1.00 s, 0.5...10.0 s or 5...100 sReset time <100 msDrop-off/pick-up ratio, typically 0.96Operate time accuracy ±2% of set value or ±40 msOperation accuracy- 10...100% x Un ±3% of set value- 2...20% x Un ±5% of set value

High-set overvoltage stage U0>>Start voltage U0>> 10...80% x Un and ∞, infinite or

2...16% x Un and ∞, infiniteStart time, typically 70 msOperate time 0.05...1.00 s, 0.5...10.0 s or 5...100 sReset time <100 msDrop-off/pick-up ratio, typically 0.96Operate time accuracy ±2% of set value or ±40 msOperation accuracy- 10...80% x Un ±3% of set value- 2...16% x Un ±5% of set value

11

Serialcommunicationparameters

Event codes

The substation level control data communica-tor is able to read, over the SPA serial bus, theevent messages of the relay module, e.g. startand trip messages, from the residual overvoltagerelay module SPCU 1C6. The events can beprinted out in the format: time (ss.sss) and eventcode. The event codes of the relay module areE1...E8 , E50 and E51. Additional event codesrelating to the data communication are gener-ated by the data communication equipment.

The event codes E1...E8 and the events repre-sented by these can be included in or excludedfrom the event reporting by writing, via the SPAbus, an event mask (V155) to the relay module.The event mask is a binary number coded to adecimal number. The event codes E1...E8 arerepresented by the numbers 1, 2, 4...128. The

event mask is formed by multiplying the abovenumbers either with 0, event not included or 1,event included in reporting and by adding theproducts, see instructions for checksum calcu-lation.

The event mask may take a value within therange 0...255. The default value of the residualovervoltage relay module SPCU 1C6 is 85,which means that any start or operation eventis included in the reporting, but no resettings.The event codes E50...E54 and the events rep-resented by these cannot be excluded from thereporting.

Event codes of residual voltage relay moduleSPCU 1C6:

Code Event Weighting Defaultcoefficient setting

E1 Starting of stage U0> 1 1E2 Starting of stage U0> reset 2 0E3 Tripping of stage U0> 4 1E4 Operation of stage U0> reset 8 0E5 Starting of stage U0>> 16 1E6 Starting of stage U0>> reset 32 0E7 Tripping of stage U0>> 64 1E8 Operation of stage U0>> reset 128 0

Default value of event mask V155 85

E50 Restart of microprocessor * -E51 Overflow of event register * -E52 Temporary interruption in the data communication * -E53 No response from the relay module over the data

communication bus * -E54 The relay module responds again over the data

communication bus * -

0 not included in the event reporting1 included in the event reporting* no code number, always included in event reporting- cannot be set

NOTE!In the SPACOM system the event codes E52...E54 are generated by the station level controldata communicator, e.g. type SRIO 1000M.

12

Data to betransferred overthe serial bus

In addition to the event code data transfer, theinput data (I data), output data (O data), set-ting values (S), memorized data (V data) andsome other data can be read from the relay

module over the serial communication bus.Further, part of the data can be changed overthe SPA bus by separate commands. All datainformation is available in channel 0.

Data Code Data Valuesdirect.

Input data

Energizing input voltage I1 R 0...250% x UnBlocking of operation of stage U0> I2 R 0 = no blocking

1 = operation of stage U0>blocked

Blocking of operation of stage U0>> I3 R 0 = no blocking1 = operation of stage I0>>

blocked

Output data

Starting of stage U0> O1 R 0 = stage U0> not started1 = stage U0> started

Operation of stage U0> O2 R 0 = stage U0> not tripped1 = stage U0> tripped

Starting of stage Uo>> O3 R 0 = stage U0>> not started1 = stage U0>> started

Operation of stage U0>> O4 R 0 = stage U0>> not tripped1 = stage U0>> tripped

Setting values

Alerted start value of stage U0> S1 R 2...100% x UnAlerted operate time of stage U0> S2 R 0.05...100 sAlerted start value of stage U0>> S3 R 2...80% x Un

999 = ∞, infiniteAlerted operate time of stage U0>> S4 R 0.05...100 sAlerted checksum of switchgroup SG1 S5 R 0...255

Start value of stage U0>, S11 R 2...100% x Unset with the setting knobOperate time of stage U0>, S12 R 0.05...100 sset with the setting knobStart value of stage U0>>, S13 R 2...80% x Unset with the setting knob 999 = ∞, infiniteOperate time of stage U0>>, S14 R 0.05...100 sset with the setting knobChecksum of switchgroup SG1, S15 R 0...255set with the switches

Remotely setting percentage of the S21 R, W 0...999%start value of stage U0>Remotely setting percentage of the operate S22 R, W 0...999%time of stage U0> or time multiplierRemotely set percentage for the S23 R, W 0...999%start value of stage U0>>Remotely setting percentage for the S24 R, W 0...999%operate time of stage U0>>Remotely set checksum of switchgroup SG1 S25 R, W 0...255

13


Remotely set start value of stage U0> S31 R 2...100% x UnRemotely set operate time of stage U0> S32 R 0.05...100 sRemotely set start value of stage U0>> S33 R 2...80% x Un

999 = ∞, infiniteRemotely set operate time of stage U0>> S34 R 0.05...100 sRemotely set checksum of switchgroup SG1 S35 R 0...255

Max. measured voltage or voltage V1 R 0...250% x Unat operationNumber of starts of stage U0> V2 R 0...255Number of starts of stage U0>> V3 R 0...255Duration of the latest start V4 R 0...100%situation of stage U0>Duration of the latest start V5 R 0...100%situation of stage U0>>

Resetting of output relays and V101 W 1 = output relays andoperation indicators operation indicators resetResetting of output relays and operation V102 W 1 = output relays andindicators and erasing of recorded data operation indicators

reset and registers(codes V1…V5) erased

Remote control of settings V150 R, W 0 = setting with knobsS11...S15 activated

1 = remote settingsS31...S35 activated

Event mask word V155 R, W 0...255, see section"Event codes"

Manual reset or self-reset mode of V156 R, W 0…15, see sectionoperation of the LED indicators "Selector switches"

Opening of password for remote settings V160 W 1...999Changing or closing of password V161 W 0...999for remote settings

Activation of self-supervision function V165 W 1 = self-supervision outputis activated and the IRFindicator turns on inabout 5 seconds, where-after the self-supervisionsystem and the IRFindicator reset

Internal fault code V169 R 0…255

Data communication address of V200 R 1...254the relay module

Program version V205 R 070_

14


Type designation of the relay module F R SPCU 1C6

Reading of event register L R Time, channel numberand event code

Re-reading of event register B R Time, channel numberand event code

Reading of module status data C R 0 = normal state1 = module been subject

to automatic reset2 = overflow of event register3 = events 1 and 2 together

Resetting of module status data C W 0 = resetting

Time reading or setting T R, W 00.000...59.999 s

R = data to be read from the moduleW = data to be written to the module

The data transfer codes L, B, C and T have beenreserved for the event data transfer between therelay module and the control data communi-cator.

The event register can be read by the L com-mand only once. Should a fault occur, for ex-ample, in the data transfer, it is possible, by us-ing the B command, to re-read the contents ofthe event register once already read by means ofthe L command. When required, the B com-mand can be repeated.

The setting values S1...S5 are the alerted setvalues currently used by the protection relaymodule. These values are set either by remotecontrol or by means of the setting knobs. Thevalues S11...S15 are set with the setting knobsand the selector switches. Variables S21...S25are set as percentage values via remote control.

The settings S21...S25 allow reading or writ-ing. A condition for writing is that the pass-word V160, for remote setting has been opened.The variables S31...S35 contain the remote set-ting values.

When the values of the variables S21...S24 areto be changed, the variables can be given a per-centage factor within the range 0...999. It ispossible to alter a setting value beyond the set-ting ranges specified in the technical data of therelay module. However, the validity of the set-ting values are guaranteed only within the set-ting ranges specified in the technical data.

Activation of the self-supervision function(V165) prevents the relay module from operat-ing as long as the self-supervision output is ac-tivated and the IRF indicator is lit.

15

Fault codes Once the self-supervision system has detected apermanent relay fault, the IRF LED on the frontpanel of the module is lit, and at the same timethe normally operated signal relay of the self-supervision system drops off.

In most fault situations an auto-diagnostic faultcode is shown on the relay display. The faultcode cannot be reset. The fault code consists of

a red digit one (1) and a green code numberthat indicates the fault type. The fault codeshould be recorded and stated when service isordered.

The fault codes of the residual overvoltage relaymodule SPCU 1C6 are explained in the follow-ing table:

Fault code Explanation

4 Faulty output relay path or missing output relay card30 Faulty program memory (ROM)50 Faulty working memory (RAM)

195 Too low a value in reference channel with multiplier 1131 Too low a value in reference channel with multiplier 5

67 Too low a value in reference channel with multiplier 25203 Too high a value in reference channel with multiplier 1139 Too high a value in reference channel with multiplier 5

75 Too high a value in reference channel with multiplier 25253 No interruptions from the A/D-converter

nUU<

0.1 1.0

nU

RESET

STEP

IRF

STEP

SG1

12345678

0 1

0.5

1.0

SPCU 3C15

0.1

0.5

0.4 1.2

0.8

U12 U23 U31

U<3U<<

k<

3U <<

1.20.1

0.6

U<<U<

[ ]s<<t

[ ]s<t

0412

A

SPCU 3C15Undervoltage relay module


2

1MRS 750588-MUM EN

Issued 96-12-02Version A (replaces 34 SPCU 4 EN1)Checked LWUApproved TL


SPCU 3C15Undervoltagerelay module

Contents Features .......................................................................................................................... 2Description of operation ................................................................................................. 3Block diagram................................................................................................................. 4Front panel ..................................................................................................................... 5Start and operation indicators ......................................................................................... 5Settings ........................................................................................................................... 6Selector switches ............................................................................................................. 6Measured data ................................................................................................................ 7Recorded information ..................................................................................................... 8Menu chart ................................................................................................................... 10Inverse time characteristics ........................................................................................... 11Technical data .............................................................................................................. 12Serial communication parameters ................................................................................. 13

Event codes ............................................................................................................. 13Data to be transferred over the serial bus ................................................................. 14

Fault codes .................................................................................................................... 17

Features Three-phase undervoltage stage U< which oper-ates when one of the three energizing voltagesfalls below the set start value

Three-phase undervoltage stage 3U<< whichoperates when all three energizing voltages si-multaneously fall below the set start value

The undervoltage stage U< can be given eitherdefinite time or inverse time operation charac-teristic

Starting of stage U< can be blocked by anexternal control signal

Operation of stages U< and 3U<< can be blockedby an external control signal

Starting and operation of stage U< can be auto-matically blocked on loss of energizing voltage

Digital display of measured and set values anddata recorded at the moment of operation

Continuous self-supervision of hardware andsoftware of the relay module including self-diagnostics

3


The undervoltage relay module SPCU 3C15measures three voltages. The module includestwo undervoltage stages. One of the stages ope-rates if at least one of the three measured voltagesfalls below the set start value, while the otherstage operates when all of the three voltages fallbelow the set start value.

If one of the three voltages measured by themodule falls below the set start value of stageU<, the module delivers a start signal SS1 afterthe set start time has elapsed. The start time ofstage U< is selected by means of the selectorswitches 1 and 2 of switchgroup SG1 and fouralternative start time values are available.

After the preset operate time t<, the under-voltage stage U< delivers an operation signalTS1. The setting range of the operate time,0.1…1.0 s or 1…10 s, is selected by means ofswitch SG1/4. If the operation of the U< stageis based on inverse time operation characteristic,the operate time depends on how much thevoltage falls below the set start value. SwitchSG1/3 is used for selecting the operation char-

acteristic, definite time or inverse time. Theinverse time operation of stage U< has oneoperation characteristic.

If all the three voltages measured by the modulefall below the set start value of the 3U<< stage,the module delivers a start signal SS2 when theset start time has elapsed. The start time of the3U<< stage is selected by means of switch SG1/6.Two alternative start time values are available.

After the preset operate time t<<, an operationsignal TS2 is delivered by the undervoltage stage3U<<, if all the three voltages remain below theset start value. One out of the two setting rangesavailable for the operate time is selected withswitch SG1/7.

To avoid unwanted operations, for instance,during an auto-reclose sequence, starting andoperation of the undervoltage stage U< can beblocked by means of switch SG1/5. The bloc-king function is activated if one of the threemeasured voltages falls to a value below 0.2 x Un.This function is illustrated in fig. 1.

Fig. 1. Operation characteristic of stage U< of the undervoltage relay module, when the selectorswitch SG1/5 = 1.

The operation of stage U< can be blocked whenstage 3U<< starts. The selection is made withswitch SG1/8.

The operation of both stages can be blocked bymeans of external blocking signals. The block-ings are selected separately for each relay unit, by

means of switchgroup SGB on the relay module.Instructions for setting the switchgroup are givenin the user's manual of the concerned protectionrelay unit and in the diagram illustrating thesignals between the relay modules of the protec-tion relay unit.

4

Block diagram

Fig. 2. Block diagram for undervoltage relay module SPCU 3C15.

U12, U23, U31 Measured phase-to-phase voltagesBS1, BS2, BS3 External blocking signals for the operation of stage U<BTS1 Blocking signal for the operation of stage U<BTS2 Blocking signal for the operation of stage 3U<<SG1 Front panel selector switchgroupSGB Selector switchgroup for blocking configuration (on the PC board)SS1 Start signal of stage U<TS1 Trip signal of stage U<SS2 Start signal of stage 3U<<TS2 Trip signal of stage 3U<<Y Yellow indicatorR Red indicator

Note!All input and output signals of the relay moduleare not necessarily wired to the terminals ofevery protection relay unit including this mod-

ule. The signals wired to the terminals are shownin the signal diagram illustrating the concernedprotection relay unit, see user's manual.

5

Front panel

Fig. 3. Front panel of undervoltage relay module SPCU 3C15.

Indicators for measured voltages

Setting knob and indicator forstarting value of stage U<

Setting knob and indicator forthe operate time t< or the timemultiplier k< of stage U<

Setting knob and indicator for thestart value of stage 3U<<

Setting knob and indicator for theoperate time t<< of stage 3U<<

Start andoperationindicators

Each stage has its own yellow/red operationindicator. Yellow light indicates starting of theoperation stage and red light indicates that thestage has delivered a tripping signal.

The red indicator remains lit when the opera-tion stage resets, thus indicating which protec-tion stage operated. The operation indicator isreset by pressing the RESET push-button. Thefunction of the relay module is not affected byan unreset operation indicator.

The self-supervision alarm indicator IRF indi-cates that the self-supervision system has de-tected a permanent fault. The indicator is litwith red light shortly after a permanent internalfault has been detected. At the same time therelay module delivers a control signal to the self-supervision output relay of the protection relay.Further, in most fault cases, a fault code indicat-ing the type of fault appears on the display of therelay module. The fault code is to be recorded toserve the subsequent fault location and repairactions.

nUU<

0.1 1.0

nU

RESET

STEP

IRF

STEP

SG1

12345678

0 1

0.5

1.0

SPCU 3C15

0.1

0.5

0.4 1.2

0.8

U12 U23 U31

U<3U<<

k<

3U <<

1.20.1

0.6

U<<U<

[ ]s<<t

[ ]s<t

0412

A

Simplified module symbol

Self-supervision alarmindicator

Numerical display

Display step push-button

Selector switch-group SG1


Reset push-button

Start/operation indicatorsType designation ofthe relay module

6

Settings The setting values are shown by the threerightmost green digits of the display. The LEDindicator below the setting knob shows, when

lit, the setting value currently being shown onthe display.

U</Un Start value of stage U< as a multiple of the rated voltage of the relay energizing input.Setting range 0.4…1.2 x Un.

t< [s] Operate time of stage U<, expressed in seconds, at definite time operation charac-teristic. The required setting range, 0.10…1.00 s or 1.00…10.0 s, is selected withswitch SG1/4. At IDMT mode of operation the setting range 0.1…1.0 of themultiplier k> is 0.05…1.00.

3U<</Un Start value of stage 3U<< as a multiple of the rated voltage of the energizing input.Setting range 0.1…1.2 x Un.

t<< [s] Operate time of stage 3U<< expressed in seconds. The setting range is selected withswitch SG1/7, alternatives 0.10…1.00 s and 1.00…10.0 s.

Further, the checksum of the selector switch-group SG1 is indicated on the display when theindicator under the switchgroup is lit. In thisway a check can be made to prove that the

switches have been set and that they work prop-erly. An example of calculating the checksum isgiven in the description "General characteristicsof C-type relay modules".

Selector switches Additional relay functions required in variousapplications are selected by means of the selectorswitches of switchgroup SG1 located on the

front panel of the relay module. The numberingof the switches, 1…8, and the switch positions,0 and 1, are marked on the front panel.

Switch Function

SG1/1 Selection of start time for the undervoltage stage U<.SG1/2

SG1/1 SG1/2 Start time

0 0 0.1 s1 0 1 s0 1 5 s1 1 30 s

SG1/3 Selection of definite time or IDMT mode of operation for the undervoltage stage U<SG1/4 and the setting range of the operate time at definite time mode of operation.

SG1/3 SG1/4 Mode of operation Operate time t<

0 0 Definite time 0.1…1.0 s0 1 Definite time 1…10 s1 0 Inverse time -1 1 Inverse time -

7

Switch Function

SG1/5 Selection of automatic blocking of starting and tripping of the undervoltage stage U<.

When SG1/5 = 0, the undervoltage stage U< always operates when at least one of themeasured voltages falls below the set start value.When SG1/5 = 1, the starting and tripping of the undervoltage stage U< is blocked ifat least one of the three measured voltages falls to a value below 0.2 x Un. This featurecan be used for preventing unnecessary startings and tripping during auto-reclosesequences.

SG1/6 Selection of start time for undervoltage stage 3U<<.

When SG1/6 = 0, the start time is 0.1 s.When SG1/6 = 1, the start time is 1 s.

SG1/7 Selection of setting range for the operate time t<< of the undervoltage stage 3U<<.

When SG1/7 = 0, the setting range of the operate time is 0.1…1.0 s.When SG1/7 = 1, the setting range of the operate time is 1…10 s.

SG1/8 Operation of undervoltage stage U< blocked by start signal from stage 3U<<.

When SG1/8 = 0, the stage U< always operates, irrespective of the operation of stage3U<<.When SG1/8 = 1, the operation of stage U< is blocked on starting of stage 3U<<.

The PC board of the relay module contains aswitchgroup SGB with eight switches. Theswitches 1…3 are used for configuring the startsignals going from the module, whereas theswitches 5, 7 and 8 are used for configuring theblocking signals applied on the undervoltage

stage 3U<< in various protection relay units.Switches 4 and 6 are used for configuring block-ing signals to stage U<. Instructions for settingthe switchgroup SGB are given in the user'smanual of the protection relay unit and in thesignal diagram of the relay.

Measured data Measured values are presented with the right-most three green digits on the display. Data to

be presented are indicated by LED indicators onthe front panel.

Indicator Measured data

U12 The U12 voltage measured by the module as a multiple of the rated voltage of therelay energizing input.



8

Recordedinformation

The leftmost red digit on the display indicatesthe register address and the three rightmostdigits the recorded information.

Register/ Recorded informationSTEP

1 Minimum voltage measured by the module as a multiple of the rated voltage of therelay energizing input, the last time when one of the three measured voltages passedbelow the set start value of stage U<. Operation of the undervoltage stage stops thedata recording sequence. Starting of the undervoltage stage erases a previouslyrecorded value and starts a new recording sequence.

2 Maximum voltage measured by the module after the previous resetting of theregisters, as a multiple of the rated voltage of the relay energizing input.

3 Lowest level of the highest voltage of the three voltages measured by the module thelast time when stage 3U<< was activated, as a multiple of the rated voltage of the relayenergizing input. A new start of the stage erases the previous value and starts a newdata recording sequence. Operation of the stage stops the recording sequence.

4 Minimum voltage measured by the module after the previous resetting of theregisters, as a multiple of the rated voltage of the relay.

5 Number of starts of the undervoltage stage U<, n (U<) = 0…255.

6 Number of starts of the undervoltage stage 3U<<, n (U<<) = 0…255.

7 Duration of the latest start event of the undervoltage stage U<, expressed as apercentage of the set operate time t<, or, at IDMT mode of operation of thecalculated operate time. A new start resets the counter, which starts counting fromzero again. If the stage has tripped, the counter reading is 100.

8 Duration of the latest start situation of the undervoltage stage 3U<<, expressed asa percentage of the set operate time t<<. A new start resets the counter, which startsrecounting from zero. If the stage has tripped, the counter reading is 100.

0 Display of blocking signals and other external control signals. The rightmost greendigit indicates the state of the blockings of the undervoltage stages. The followingstates are indicated:0 = no blockings1 = operation of the undervoltage stage U< blocked2 = operation of the undervoltage stage 3U<< blocked3 = operation of both stages blocked

The middle digit of the register is always a zero. The leftmost green digit indicatesthe state of the remote reset input, if any. The following states are indicated:0 = remote reset control input not energized1 = remote reset control input energized

From this register it is possible to move on to the TEST mode, where the startingand tripping signals of the module can be activated one by one. For further detailssee description "General characteristics of C-type relay modules".

9

Register/ Recorded informationSTEP

A The address code of the measuring relay module, required by the serial communi-cation system.

Submenu 1: Selection of the data transfer rate.

Submenu 2: Bus traffic monitor. If the relay module is connected to a datacommunication system and the communication is operating, the counter readingof the bus traffic monitor will be 0. Otherwise the numbers 0...255 are continuouslyrolling in the counter.

Submenu 3: Password required for remote setting. The password given in the settingmode of a submenu must always be entered via the serial communication before thesettings can be altered remotely.

If the module is connected to a control data communicator, for instance type SRIO1000M and the data communication is operating, the counter of the monitor iszero. If the communication is interrupted the digits 0…255 are continuouslyscrolling in the counter.

When the display is dark, the register can be re-entered by pressing the STEP push-button.

The registers 1…8 are cleared by pressing thepush buttons STEP and RESET simultaneouslyor via the SPA bus using the command V102.The registers are also cleared if the auxiliarypower supply to the module is interrupted. Theaddress code of the relay module, the data trans-fer rate of the serial communication system and

the password are not erased by interruptions inthe auxiliary supply. The instructions for settingthe address and the data transfer rate are given inthe manual "General characteristics of C-typerelay modules".

At the initial state when none of the stages hasstarted, the reading of register 1 is "000" andthat of register 3 is "- - -".

10

Menu chart

Fig. 4. Main menus and submenus of the undervoltage relay module SPCU 3C15.

The procedure for entering a submenu or asetting mode and configuring the module is

described in detail in "General characteristics ofC-type relay modules".

Display switched off. State also reached after 5 min. time-out

= value to be set in the setting mode

1

1 2Set starting value U<of stage U<

Set starting timet<(k<) of stage U<

1Set starting value3U<< of stage 3U<<

1 2Set operating time t<< of stage 3U<<

3

4

5

6

0 0 000 Triptest

TS2SS1 TS1 SS2

A 3

1Checksum of switch-group SG1

Remote settingpercentage p1

Remote settingvalue U< x p1

Remote settingvalue t< x p2


Remote settingvalue 3U<< x p3


Remote settingvalue t<< x p4


Remotely setchecksum

Remotely setchecksum

Min. voltage measured during the laststarting of U<

Max. voltage measured after resetting

Min. voltage measured during the laststarting of 3U<<

2

Min. voltage measured after resetting

Number of startings of U<- stage

Number of startings of 3U<<- stage

7

8

Duration of the latest starting situation ofstage U<

Duration of the latest starting situation ofstage 3U<<

Incomingblockings

Module addres code

Baud ratesetting (Bd)

Bus communication monitor 0…255 (s)

Password forremote setting1 2

1 2

2

2

Voltage U measured12



MAIN MENU SUBMENU

STEP 0,5 s RESET 1 s

SUBMENUSTEP FORWARD 1 sSTEP BACKWARD 0,5 s

STEP

BACKWARD

.5s

STEP FORWARD

1s

MAIN MENU

11

Inverse timecharacteristics

At IDMT operation characteristic the operatetime of the undervoltage stage U< is shorter thelower the voltage in comparison with the setstart voltage.

The operation of the U< stage is based on anIDMT operation characteristic, when the selec-tor switch SG1/3 on the front panel is in theposition 1. The relationship between time andvoltage at an IDMT operation characteristic canbe expressed as:

t = + d [s]

wheret = operate time /sk< = time multiplierU = voltage value /VU< = set start voltage /Va = constant 480b = constant 32d = constant 0.055p = constant 2

Recording of the operation time does not startuntil the voltage falls to a value of 6% below theset start value. The operate time accuracy statedin the technical data applies when the voltagefalls to a level of 10% below the set start value.The undervoltage stage includes one operationcharacteristic with one degree of inversity.

Fig. 5. Inverse time operation characteristic of the undervoltage stage U<.

1,00,7

0,4

k<

0,2

0,1

U/U< 0,5 0,6 0,7 0,8 0,9 1,00,01

0,1

1

10

100

1000

t/s

U< - UU<

k< x a

( ) p

12

Technical data Undervoltage stage U<Start voltage U< 0.4…1.2 x UnStart time 0.1 s, 1 s, 5 s or 30 sOperate time at definite time operationcharacteristic 1.1…1.00 s or 1…10 sTime multiplier k< at IDMT operationcharacteristic 0.1…1.00Reset time ≤80 msDrop-off/pick-up ratio ≥1.03Operate time accuracy at definite time operationcharacteristic and start time accuracy ±2% of set value or ±25 msOperate time accuracy at IDMT operationcharacteristic ±25 ms or the inaccuracy appearing

when the measured voltage varies ±3%Operate accuracy ±3% of set value

Undervoltage stage 3U<<Start voltage 3U<< 0.1…1.2 x UnStart time 0.1 s or 1.0 sOperate time at definite time operationcharacteristic 0.1…1.0 s or 1…10 sReset time ≤80 msDrop-off/pick-up ratio- when the start value of the 3U<< stage >0.4 ≤1.03- when the start value of the 3U<< stage <0.4 approx. 1.1Operate time accuracy and start time accuracy ±2% of set value or ±25 msOperate accuracy ±3% of set value

13

Serialcommunicationparameters

Event codes

The substation level control data communica-tor is able to read, over the SPA serial bus, theevent data of the module, e.g. starting andtripping, from the undervoltage relay moduleSPCU 3C15. Event information called for areprinted out in the format: time (ss.sss) and eventcode. The event codes of the module are E1...E8,E50 and E51. Furthermore, the substation levelcontrol data communicator forms event codesrelating to the data communication.

The codes E1...E8 and the events represented bythese can be included in or excluded from theevent reporting by writing, over the SPA bus, aso called event mask (V155) to the module. Theevent mask is a binary number coded to adecimal number. The event codes E1...E8 are

represented by the numbers 1, 2, 4...128. Theevent mask is formed by multiplying the abovenumbers either by 0 (event not included inreporting) or 1 (event included in reporting)and adding up the numbers received (comparecalculation of checksum).

The event mask may have a value in the range0...255. The default value of the undervoltagerelay module SPCU 3C15 is 85, which meansthat all startings and trippings are included inthe reporting, but not the resetting. The codesE50...E54 and the events represented by thesecannot be excluded from the reporting.

Event codes for undervoltage relay module SPCU3C15:

Code Event Weighting Defaultcoefficient setting

E1 Starting of undervoltage stage U< 1 1E2 Starting of undervoltage stage U< reset 2 0E3 Tripping of undervoltage stage U< 4 1E4 Tripping of undervoltage stage U< reset 8 0E5 Starting of stage 3U<< 16 1E6 Starting of stage 3U<< reset 32 0E7 Tripping of stage 3U<< 64 1E8 Tripping of stage 3U<< reset 128 0

Default value of event mask V155 85

E50 Restart of microprocessor * -E51 Overflow of event register * -E52 Temporary interruption in data communication * -E53 No response from the relay module over the data

communication bus * -E54 The module responds again over the data

communication bus * -

0 not included in the event reporting1 included in the event reporting* no code number, always included in event reporting- cannot be set

NOTE!In the SPACOM system the event codes E52...E54 are generated by the station level controldata communicator, e.g. type SRIO 1000M.

14

Data to betransferred overthe serial bus

In addition to the event code data transfer, theinput data (I data), output data (O data), settingvalues (S), memorized data (V data) and someother data can be read from the relay module

over the serial communication bus. Further,part of the data can be changed over the SPA busby separate commands. All data information isavailable in channel 0.


Measured voltage U12 I1 R 0…9.99 x UnMeasured voltage U23 I2 R 0…9.99 x UnMeasured voltage U31 I3 R 0…9.99 x UnBlocking of undervoltage stage U< I4 R 0 = no blocking

1 = tripping of stage U<blocked

Blocking of undervoltage stage 3U<< I5 R 0 = no blocking1 = tripping of stage 3U<<

blocked

Starting of undervoltage stage U< O1 R 0 = U< stage not started1 = U< stage started

Tripping of undervoltage stage U< O2 R 0 = U< stage not tripped1 = U< stage tripped

Starting of undervoltage stage 3U<< O3 R 0 = 3U<< stage not started1 = 3U<< stage started

Tripping of undervoltage stage 3U<< O4 R 0 = 3U<< stage not tripped1 = 3U<< stage tripped

Activated start value of stage U< S1 R 0.4…1.2 x UnActivated operate time t< of stage U< S2 R 0.1…10 s oror time multiplier k< 0.1…1.0Activated start value of stage 3U<< S3 R 0.1…1.2 x UnActivated operate time t<< of stage 3U<< S4 R 0.1…10 sActivated checksum of switchgroup SG1 S5 R 0…255

Start value of stage 3U<, S11 R 0.4…1.2 x Unset with the setting knobOperate time or time multiplier of stage S12 R 0.1…10 s or3U< , set with the setting knob 0.1…1.0Start value of stage 3U<<, S13 R 0.1…1.2 x Unset with the setting knobOperate time of stage 3U<<, S14 R 0.1…10 sset with the setting knobChecksum of switchgroup SG1, S15 R 0…255(set with the switches)

Remote setting percentage of the S21 R, W 0…999%start value for stage U<Remote setting percentage for the operate S22 R, W 0…999%time or time multiplier of stage U<Remote setting percentage for the start S23 R, W 0…999%value of stage 3U<<Remote setting percentage for the operate S24 R, W 0…999%time of stage 3U<<Remotely set checksum of S25 R, W 0…255switchgroup SG1

15


Remote setting of the start value S31 R 0.4…1.2 x Unof stage U<Remote setting of the operate time S32 R 0.1…10 s oror time multiplyer of stage U< 0.1…1.0Remote setting of the start value S33 R 0.1…1.2 x Unof stage 3U<<Remote setting of the operate time S34 R 0.1…10 sof stage 3U<<Remotely set checksum of S35 R 0…255switchgroup SG1

Minimum voltage measured after V1 R 0…9.99 x Unstarting of stage U<Maximum voltage measured after resetting V2 R 0…9.99 x UnMinimum voltage measured after V3 R 0…9.99 x Unstarting of stage 3U<<Minimum voltage measured after resetting V4 R 0…9.99 x UnNumber of starts of stage U< V5 R 0…255Number of starts of stage 3U<< V6 R 0…255Duration of the latest start event V7 R 0…100%of stage U<Duration of the latest start event V8 R 0…100%of stage 3U<<

Resetting of recorded data V102 W 1 = registers V1…V8 are reset

Remote control of settings V150 R, W 0 = potentiometer settingsS11…S15 activated

1 = remote settingsS31…S35 activated

Event mask word V155 R, W 0…255, see section"Event codes"

Opening of password for remote V160 W 1…999settingsChanging or closing of password V161 W 0…999for remote settings

Activation of self-supervision function V165 W 1 = self-supervision outputis activated and IRF in-dicator turns on in about5 seconds, after which theself-supervision systemand the IRF indicator reset

Data communication address V200 W 1…254of the relay module

Program version V205 R 018 _

16


Type designation of the relay module F R SPCU 3C15

Reading of event register L R Time, channel numberand event code

Re-reading of event register B R Time, channel numberand event code

Reading of module status data C R 0 = normal state1 = module been subject

to automatic reset2 = overflow of event register3 = events 1 and 2 together

Resetting of module status data C W 0 = resetting

Time reading or setting T R, W 00.000…59.999 s

R = data to be read from the relay moduleW = data to be written to the relay module

The data transfer codes L, B, C and T have beenreserved for the event data transfer between therelay module and the control data communica-tor.

The event register can be read by the L com-mand only once. Should a fault occur, for exam-ple, in the data transfer, it is possible, by usingthe B command, to re-read the contents of theevent register once already read by means of theL command. When required, the B commandcan be repeated.

The setting values S1...S5 are the alerted setvalues currently used by the protection relaymodule. These values are set either by remotecontrol or by means of the setting knobs. Thevalues S11...S15 are set with the setting knobsand the selector switches. Variables S21...S25are set as percentage values via remote control.

The settings S21...S25 allow reading or writing.Acondition for writing is that password V160,for remote setting has been opened. The vari-ables S31...S35 contain the remote setting val-ues.

When the values of the variables S21...S24 are tobe changed, the variables can be given a percent-age factor within the range 0...999. It is possibleto alter a setting value beyond the setting rangesspecified in the technical data of the relay mod-ule. However, the validity of the setting valuesare guaranteed only within the setting rangesspecified in the technical data.

Activation of the self-supervision funktion(V165) prevents the relay module from operat-ing as long as the self-supervision output isactivated and the IRF indicator is lit.

17

Fault codes Once the self-supervision system has detected apermanent relay fault, the IRF LED on the frontpanel of the module is lit, and at the same timethe normally operated signal relay of the self-supervision system drops off.

In most fault situations an auto-diagnostic faultcode is shown on the relay display. The fault

code cannot be reset. The fault code consists ofa red digit one (1) and a green code number thatindicates the fault type. The fault code should berecorded and stated when service is ordered.

The fault codes of the undervoltage relay mod-ule SPCU 3C15 are explained in the followingtable:

Fault code Explanation

4 Faulty output relay path or missing output relay card30 Faulty program memory (ROM)50 Faulty working memory (RAM)

195 Too low a value in reference channel with multiplier 1131 Too low a value in reference channel with multiplier 5

67 Too low a value in reference channel with multiplier 25203 Too high a value in reference channel with multiplier 1139 Too high a value in reference channel with multiplier 5

75 Too high a value in reference channel with multiplier 25253 No interruptions from the A/D-converter

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B

Indicators for measured values

Setting knob 1with indicator

Stage 1



Stage 2


Self-supervision alarm indicator(Internal Relay Fault)

Display, 1 + 3 digits

Step push-button (STEP)

Programming switches SG1


Reset push-button (RESET)

Start/operation indicators

General characteristics ofC-type relay modules


2

General characteristics ofC-type relay modules

Contents Push-buttons .................................................................................................................. 2Programming switches SG1 ............................................................................................ 2Setting knobs .................................................................................................................. 3Display ........................................................................................................................... 3

Display main menu ................................................................................................... 3Display submenu ....................................................................................................... 4Setting mode ............................................................................................................. 4Example: Operation in setting mode ......................................................................... 5Stored information .................................................................................................... 6Trip-test mode........................................................................................................... 7Example: Trip-test function ...................................................................................... 8

Operation indicators ....................................................................................................... 9Fault codes ...................................................................................................................... 9

Push-buttons The front panel of the relay module containstwo push-buttons. The STEP button is used forstepping forward in the display and the RESETbutton for resetting the red indicators. Addi-tionally, the push-buttons are used for certain

settings, e.g. for setting the address of the relaymodule and the data transfer rate for the serialcommunication when the modules are used inrelay packages provided with this quality. (Seesection Display).

Programmingswitches SG1

Part of the settings and the selections of theoperating characteristics for the relay modulesin various applications are made with the pro-gramming switches SG1 on the front panel. Theindicator of the switchgroup glows when the

checksum of the switchgroup is shown on thedisplay. The checksum can be used for checkingthat the switches are properly set. Fig. 2 gives anexample of calculating the checksum.

Fig. 2. Example of calculating the checksum of programming switchgroup SG1.

When the checksum calculated according to theexample is equal to the checksum indicated onthe display of the relay module, the switches areproperly set.

The function of the programming switches ofthe individual measuring relay modules is speci-fied in the description of the module concerned.

1MRS 750328-MUM EN

Issued 96-02-19Version A (replaces 34 SPC 2 EN1)Checked L-W UApproved TK


3

Setting knobs Most of the operating values and operatingtimes are set by means of the setting knobs onthe front panel of the relay module. Each settingknob has its own (LED) indicator which glowswhen the concerned setting value is shown onthe display.

If a setting knob is turned while the display isshowing another measured or set value, thevalue being set automatically appears on thedisplay. Simultaneously, the indicator for theconcerned setting starts glowing.

In addition to the settings made with the settingknobs, most modules allow so called remotesetting. This means that the settings made bymeans of the setting knobs of the module andthe checksum of the programming switchgroupmay be altered through an instruction over theserial communication bus. Remote setting ispossible if the password in the register A isknown, and the remote settings are not acti-vated, i.e. parameter V150=0. The circumstancethat the remote settings are activated is shownwith a flashing light of the indicator of thesetting knob, the value of which currently isbeing displayed.

Display The measured and set values as well as the datarecorded are shown on the display of the meas-uring relay module. The display consists of fourdigits. The three digits (green) to the rightindicate the measured, set or stored value andthe digit at the extreme left (red) the number ofthe register. The measured or set value displayedis indicated by a yellow LED indicator. Thenumber of the register glows only when a storedvalue is displayed.

When the auxiliary voltage is connected to ameasuring relay module, the module initiallytests the display by stepping through the digits1...9 for about 15 seconds. When the test isfinished the display turns dark. The testing canbe interrupted by pressing the STEP button.The protective functions of the module areoperative throughout the testing.

Display main menu All the data required during normal operatingconditions are accessible from the main menuwhich presents the measured values in real-time,the normal setting knob settings as well as themost important memorized data.

The data to be shown in the main menu areselected to the display in a certain sequence bymeans of the STEP button. When pressing theSTEP button for about one second, the displaymoves forward in the display sequence. Whenpressing it for about 0.5 seconds, the displaymoves backwards in the display sequence.

From a dark display only forward movement ispossible. When keeping the STEP button de-pressed, the display is continuously moving inforward direction stopping for a while at thedark point.

Unless the display is switched off by stepping tothe dark point, it remains activated for about 5minutes from the last pressing of the STEPbutton and then goes out.

4

Display submenu Less important values and values not very oftenset are displayed in the submenus. The numberof submenus varies with different relay moduletypes. The submenus are presented in the de-scription of the concerned module.

A submenu is entered from the main menu bypressing the RESET button for about one sec-ond. When the button thereafter is released, thered digit (STEP) of the display starts flashing,indicating that one is in a submenu. Going fromone submenu to another or back to the mainmenu follows the same principle as when mov-ing from the main menu display to another; the

display moves forward when pressing the STEPbutton for one second and backward whenpressing it for 0.5 seconds. The return to themain menu has taken place when the red STEPdisplay turns dark.

When entering a submenu from a measured orset value indicated by a LED indicator, theindicator remains glowing and the address win-dow (STEP) of the display starts flashing. Aflashing address window when no LED indica-tor is lit indicates that the submenu of a registerhas been entered.

Fig. 3. Example of the main and submenus for the settings of the overcurrent relay module SPCJ3C3. The settings made with the setting knobs are in the main menu and they are displayed bypressing the STEP button. In addition to the setting knob settings the main menu contains themeasured current values as well as the registers 1…5, as well as 0 and A. The remote settingpercentage and remote setting value are located in the submenus for the settings and are activatedon the display by pressing the RESET button.

Setting mode The registers of the main menu and the submenusalso contain parameters to be set. The settingsare made in the so called setting mode, which isaccessible from the main menu or a submenu bypressing the RESET button, until the digit atthe extreme right starts flashing (about 10 s).The flashing digit is set by means of the STEPbutton. The flashing is moved on from digit todigit by pressing the RESET button.

A set value is stored in the memory by pressingthe push-buttons STEP and RESET simultane-ously. In practice the RESET button must be

pressed slightly in excess of the STEP button.Return from the setting mode to the main menuor submenu is possible by pressing (for about 10s) the RESET button until the green digits onthe display stop flashing. If the module is left inthe setting mode, it will return automatically tothe start condition after about 5 minutes.

The values to be set in the setting mode are forinstance the address code of the relay moduleand the data transfer rate for the serial commu-nication. Further the percentage values for theremote settings can be changed.

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Example 1: Function in the setting mode. Manual setting ofthe address code of a relay module and the datatransfer rate for the serial communication. Theinitial value for the address code is 146.

a)Press push-button STEP until register address Aappears on the display.

b)Press the RESET button for about 10 s until theright most digit starts flashing.

c)Press the STEP button repeatedly to set the digitto the value desired.

d)Press the RESET button to make the middle ofthe green digits flash.

e)Set the middle address digit by means of theSTEP button.

f)Press the RESET button to make the left mostgreen digit flash.

g)Set the digit by means of the STEP button.

h)Store the set address number in the memory ofthe relay module by pressing the RESET andSTEP button simultaneously. At the momentthe information enters the memory, the threegreen dashes flash in the display, i.e. A—.

i)Leave the setting mode by pressing the RESETbutton for about 10 s, until the display stopsflashing.

j)Then enter submenu 1 of register A by pressingthe RESET button for approx. one second. Theregister address A is then replaced by a flashing1. This submenu is used for setting the datatransfer rate of the serial communication.

k)The data transfer rate for the serial communica-tion is set and stored in the same way as theaddress, see sections b...i, except that the con-tinuously glowing register address has been re-placed by a flashing 1.

l)After storing the data transfer rate for the serialcommunication you may return to the mainmenu of register A by pressing the STEP buttonfor about 0.5 second.

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Stored information The parameter values measured at the momentwhen a fault occurs are recorded in the registers,in some modules also the setting values. Therecorded data, except for some setting param-eters, are set to zero by pressing the push-buttons STEP and RESET simul-taneously.The data in normal registers are erased if theauxiliary voltage supply to the relay is disrupted,only the set values and the number ofautoreclosings are maintained in the registers ata voltage failure.

The number of the registers varies with differentmodule types. The function of the registers areillustrated in the descriptions of the separaterelay modules. Additionally, the system panelcontains a simplified list of the data recorded bythe various relay modules of the relay assembly.

All C-type relay modules are provided with twogeneral registers: register 0 and register A.

Register 0 contains, in coded form, the informa-tion about e.g. external blocking signals andstatus information for the circuit breaker. Thecodes are explained in the descriptions of therelay modules.

Register A contains the address code of the relaymodule as required by the serial communicationsystem. Example 1 on page 4 shows how theaddress code is altered. Submenu 1 of register Acontains the data transfer rate value expressed inkilobaud for the serial communication.

Submenu 2 of register A contains a bus trafficmonitor for the SPACOM system. If the protec-tive relay, which contains the relay module, islinked to a system including the control datacommunicator and the data communicationsystem is operating, the counter reading of themonitor will be zero. Otherwise the digits 1...255are continuously rolling in the monitor.

Submenu 3 contains the password required forchanging the remote settings. The address code,the data transfer rate for the serial communica-tion and the password can be set manually or viathe serial communication bus. For manual set-ting see example 1.

The start value for the address code and thepassword is 001 and that for the data transferrate 9.6 kilobaud.

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Trip-test mode Register 0 also allows access to the so calledTrip-test function, which allows the outputsignals of the relay module to be activated one byone. If the auxiliary relay module of the protec-tion assembly is in place, the auxiliary relays willbe included in the testing.

When pressing the RESET button for about 10seconds, the three green digits to the right startflashing to indicate that the relay module is intest position. The indicators of the setting knobsindicate by flashing which output signal can beactivated. The required output function is se-lected by pressing the RESET button for about1 second, until the following LED indicatorstarts flashing.

The indicators of the setting knobs refer to thefollowing output signals:Setting knob 1 SS1 Starting of stage 1Setting knob 2 TS1 Tripping of stage 1Setting knob 3 SS2 Starting of stage 2Setting knob 4 TS2 Tripping of stage 2No indication IRF Self-supervision

The selected starting or tripping is activated bysimultaneous pressing of the push-buttons STEPand RESET. The signal remains activated aslong as the two push-buttons are being pressed.

The self-supervision output is activated by press-ing the STEP button once when no setting knobindicator is flashing. The IRF output is acti-vated in about 5 seconds after pressing of theSTEP button, and resets after that. Simultane-ously, the display returns to the main menu andperforms the initial testing indicated by rollingdigits 0...9 in the display several times.

The signals are selected in the order illustrated infig. 4.

REGISTER 0IRF SS1 TS1 SS2 TS2

STEP STEP+RESET

STEP+RESET

STEP+RESET

STEP+RESET

RESET10 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

Fig. 4. Sequence order for selecting the output signals in the Trip-test mode.

If e.g. the indicator of the setting knob 2 (secondfrom the top) is flashing, and the push-buttonsSTEP and RESET are being pressed, the signalTS1 (tripping of stage 1) is activated. Return tothe main menu is possible at any stage of the

Trip-test sequence scheme, by pressing theRESET button for about 10 seconds. If themodule is left in the Trip-test mode, it willreturn automatically after approx. 5 minutes.

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Example 2: Trip-test function. Forced activation of the out-puts is made as follows:

a)Step forward on the display to register 0.

b)Press the RESET button for about 10 secondsuntil the three green digits to the right and theLED indicator of the uppermost setting knobstart flashing.

c)Press the push-buttons RESET and STEP si-multaneously. Then the starting of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3) is activated and, simultaneously, the indi-cator of the stage starts glowing yellow.

d)Press the RESET button for about 1 seconduntil the indicator of the second setting knobstarts flashing.

e)Press the push-buttons RESET and STEP si-multaneously to activate tripping of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3). The indicator of the concerned stagestarts glowing red.

f)Starting and tripping of the second stage isactivated in the same way as stage 1. The indica-tor of the third or fourth setting starts flashing toindicate that the concerned stage has been acti-vated.

g)To activate the self-supervision output step to-wards the test position, where no indicator isflashing. Press the STEP button once. In about5 seconds the red IRF indicator starts glowingand the IRF output is activated. Shortly thereaf-ter the indicator goes out and the output auto-matically resets. At the same time the moduleleaves the test position.

h)It is possible to leave the trip test mode at anystep of the sequence scheme by pressing theRESET button for about 10 seconds until thethree digits to the right stop flashing.

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Operationindicators

A measuring relay module is provided with twoseparate operating stages, each of which with itsown yellow/red operation indicator on the lowerpart of the front plate of the relay module.

The operation indicator starts glowing yellowwhen the operating stage starts and red when adelayed tripping operates. The functions of thestart and operation indicators are described indetail in the different protection relay modulemanuals.

Fault codes In addition to the protective functions the relaymodule is provided with a self-supervision sys-tem which continuously supervises the functionof the microprocessor, its program executionand the electronics.

When the self-supervision system has detected apermanent fault in the relay module, the redIRF indicator on the panel starts glowing soonafter the fault was discovered. At the same timethe module puts forward a signal to the self-supervision contact of the relay assembly.

In most fault situations a fault code, indicatingthe nature of the fault, appears on the display ofthe module. The fault code, which consists of ared digit (1) and a three digit green code number,cannot be removed from the display by reset-ting. When a fault occurs, the fault code shouldbe recorded and stated when service is ordered.

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