zx0 block design gas-insulated medium voltage switchgear · 2021. 2. 16. · covers the entire...

— TECHNIC AL C ATALOGUE TK 50 0/17 EN

ZX0 block designGas-insulated medium voltage switchgear

2 | Technical catalogue ZX0 TK 500 en - Revision 17

Page

Content

1 Introduction 5

2 Applications 6

3 Characteristics 7

4 Your benefit 8

5 Technical data 9

5.1 Technical data of the panel 9

5.2 Technical data of the circuit-breaker 12

5.3 Technical data of the three position disconnector 13

5.4 Technical data of the three position switch disconnector with or without HV HRC fuses 13

5.5 HV HRC fuses 14

5.5.1 Selection of HV HRC fuses, ABB 14

5.5.2 Selection of HV HRC fuses, Siba 15

6 Fundamental structure of the panels 17

7 Components 22

7.1 Vacuum circuit-breaker 24

7.2 Three position disconnector 28

7.3 Three position switch disconnector 31

7.4 Three position switch disconnector with fuse 32

7.5 Busbar 33

7.6 Outer cone termination system 34

7.7 Surge arresters 35

7.8 Main earthing bar 35

7.9 Capacitive voltage indicator systems 35

7.10 Current and voltage detection devices 37

7.10.1 Ring core current transformers 37

7.10.2 Dimensioning of current transformers 38

7.10.3 Voltage transformers 39

7.11 Protection and control units 40

7.12 Sulphur hexafluoride 41

7.13 Gas system in the panels 41

7.14 SF6 density sensors 42

7.15 Pressure relief systems 43

7.16 Surfaces 43

Technical Catalogue ZX0 - TK 500 en- Revision 17 | 3

Page

8 Range of panels 44

8.1 Feeder panels 44

8.1.1 Incoming and outgoing feeder panels with circuit-breaker 44

8.1.2 Feeder panels with three position switch disconnector 46

8.1.3 Feeder panels with three position switch disconnector and fuse 47

8.1.4 Cable termination panels 48

8.2 Busbar sectionaliser and riser panels 49

8.2.1 Couplings within a switchgear block 49

8.2.2 Coupling (connection of two system blocks) 52

8.3 Metering panels 53

8.4 Busbar earthing panel 54

8.5 Design to order panels 55

9 Busbar earthing 56

9.1 Earthing the busbar by means of an earthing set 56

9.2 Earthing the busbar by means of a sectionaliser and riser or bus coupler 56

10 Building planning 57

10.1 Site requirements 57

10.2 Space required 58

10.2.1 Space required for wall mounting installation 59

10.2.2 Space required for free-standing installation 60

10.3 Minimum aisle widths and emergency exits 61

10.4 Minimum room heights 62

10.5 Floor openings 62

10.6 Foundation frames 64

10.7 False floor 65

10.8 Earthing of the switchgear 65

10.8.1 Design of earthing systems with regard to touch voltage and thermal stress 65

10.8.2 EMC-compliant earthing of the switchgear 66

10.8.3 Recommendations on configuration of the switchgear earthing 66

10.9 Panel weights 67

11 Non-standard operating conditions 68


Switchgear systems and their components rank among the most important facilities for electrical power transmission and distribution. Their versatile functions and the opportunities they provide contribute on the one hand to safety in general, and on the other hand they secure the availability of electrical energy.

Our ZX product family, consisting of panel types

ZX0: ... 24 kV ... 1250 A ... 25 kA

ZX0.2: ... 36 kV ... 2500 A ... 31.5 kA

ZX1.2: ... 40.5 kV ... 2500 A ... 31.5 kA

ZX2: ... 40.5 kV ... 2500 A ... 40 kA

covers the entire spectrum of primary distribution applications.

Flexible combination, reliability, availability and economy are the attributes that make it easy for our clients in industry and utilities to decide in favor of products from the ZX series. Together with complete conventional solutions, the use of digital protection and control technology, sensor systems and plug-in connections makes ZX systems unrestrictedly fit for the future, and the primary function of reli-able power distribution is fulfilled with no ifs and buts. This is ensured by ABB’s uncompromising approach to quality, which leaves no customer’s wishes unfulfilled. Aligned to each need, the panel types of the ZX family offer a solution for each requirement. In over 70 countries the customers rely on gas-insulated switchgears from ABB.

The ZX series leave our works as tested panels and, as SF6 switchgear, are exemplary in terms of safety, economy and availability. Their compact design permits installation in even the most constricted spaces. The hermetically sealed enclosures make the systems shock-proof and protect the high voltage components from all environmental influences.

ABB AG’s Calor Emag Medium Voltage Products division develops, manufactures and installs switchgear systems and components for electrical power distribution in the medium voltage range. Based in Ratingen, Germany, we have the know-how, global project experi-ence and local partners for the supply of panels and turnkey medium voltage switchgear systems.

1 Introduction


2 Applications

Power supply companies

– Power stations – Transformer substations – Switching substations

Industry

– Steel works – Paper manufacture – Cement industry – Textiles industry – Chemicals industry – Foodstuffs industry – Automobile industry – Petrochemicals – Raw materials industry – Pipeline systems – Foundries – Rolling mills – Mining

Marine

– Platforms – Drilling rigs – Offshore facilities – Supply vessels – Ocean liners – Container vessels – Tankers – Cable laying ships – Ferries

Transport

– Airports – Harbours – Railways – Underground railways

Services

– Supermarkets – Shopping centres – Hospitals


Basic characteristics

– SF6 gas-insulated with hermetically sealed pressure system

– Rated voltages up to 24 kV – Up to 1250 A and 25 kA – Single busbar design – Grouping of up to six panels in a block

(one common gas compartment) – Stainless steel encapsulation, manufactured

from laser cut sheet material – Modular structure – Switchgear with a leakage rate of less

than 0.1 % per annum – Integrated leakage testing of the panels – Indoor installation – Wall mounting and free-standing installation – Panel width 400 mm and 600 mm

Panel variants

– Incoming and outgoing feeder panels as – Circuit-breaker panels – Switch disconnector panels and – Switch disconnector panels with fuses

– Cable termination panels – Bussectionaliser panels as

– Circuit-breaker panels – Switch disconnector panels

– Busriser panels – Metering panels – Customised panel versions

Switching devices

– Vacuum circuit-breakers with series three position disconnectors

– Three position switch disconnectors with and without fuses

Terminals

– Outer cone terminal system to EN 50181, type A for panels with switch disconnector, type C for all other panels with cable terminations

– Connection facility for surge arresters on the cable connector

Current and voltage metering

– Instrument transformers

Protection and control

– Combined protection and control devices – Discrete protection devices with conventional control

Protection against maloperation

– Electrical switch interlocking with motor-operated mechanisms

– Mechanical switch interlocking with manual mechanisms

Pressure relief

– Pressure relief into the switchroom, or – Pressure relief into the cable basement

Installation

– Blocks joined together by plug-in connectors

3 Characteristics


Maximum operator safety

– All live components are enclosed to prevent accidental contact.

– As the high voltage compartments are independent of ex-ternal influences (degree of protection IP65), the probability of a fault during operation is extremely low.

– As evidenced by arc fault testing, our switchgear systems are notable for maximum operator safety.

Minimum overall costs

– The compact design of the panels reduces the space re-quired and therefore the size of the station. The result is a lower investment requirement.

– Freedom from maintenance is achieved by constant condi-tions in the high voltage compartments in conjunction with the selection of suitable materials. The injurious influences of dust, vermin, moisture, oxidation and contaminated air in the high voltage compartments are precluded, as the gas-tight compartments are filled with inert gas. As a rule, therefore, isolation of the switchgear to perform maintenance work is not required.

– The panels are designed for an expected service life of over 40 years.

– The systematic selection during the development process of the materials used provides for complete recycling or reuse of those materials at the end of the service life.

– The panel blocks only leave our production facilities after documented routine testing. Thanks to the plug-in tech-nology applied in the areas of the busbars, cables and secondary systems, extremely short installation times are possible.

– No gas work is required as a rule at site. There is thus no need to evacuate and fill the high voltage compartments, test them for leakage and measure the dewpoint of the insulating gas at site.

Maximum availability

– The plug-in busbar technology without screw couplings permits simple and therefore safe assembly.

– In spite of the extremely low failure probability of the ZX switchgear systems, replacement of components in the gas compartments and therefore a rapid return to service after repairs is possible.

– In gas-insulated switchgear, earthing of switchgear sec-tions is performed by a high quality vacuum circuit-breaker. The circuit-breaker can close onto a short-circuit signifi-cantly more frequently and reliably than a positively making earthing switch.

4 Your benefit


Table 5.1.1: Technical data of the panel

Rated voltage / maximum operating voltage Ur kV 12 24

Rated power frequency withstand voltage 1) Ud kV 28 50

Rated lightning impulse withstand voltage 1) Up kV 75 125

Rated frequency 2) fr Hz 50

Rated normal current of busbars 3) Ir A ...1250

Rated normal current 3) Ir A ...1250

Rated short-time withstand current Ik kA ...25

Rated peak withstand current Ip kA ...63

Rated duration of short-circuit tk s ...3

Insulating gas system 4) 5)

Alarm level for insulation pae kPa 6) 120

Rated filling level for insulation pre kPa 130

Minimum functional level for operation 7) pmm kPa 120

Rated filling level for switch 7) psw kPa 130

Degree of protection for gas filled compartments IP65

Degree of protection of low voltage compartment 8) IP4X

Ambient air temperature, maximum °C +40

Ambient air temperature, maximum 24 hour averages 9) °C +35

Ambient air temperature, minimum °C -5

Site altitude 10) m ...1000

1) Higher levels to international standards on request2) Rated current for 60 Hz on request3) Higher operating currents on request4) Insulating gas: SF6 (sulphur hexafluoride)5) All pressures stated are absolute pressures at 20 °C6) 100 kPa = 1 bar7) Only relevant for three position switch disconnector panels8) IP2X for panels with three position switch disconnectors, IP3X for panels with circuit-breakers and mechanical controls, higher degrees of protection on request9) Higher ambient air temperature on request10) Higher site altitude on request

5 Technical data

5.1 Technical data of the panel


Classifications according to VDE 0671-200 / IEC 62271-200

- Internal arc classification

The panels are arc fault tested in accordance with IEC 62271-200.

Table 5.1.2: Internal arc classification of the switchgear

Internal arc classification

Wall mounting installationClassification IAC AFL

Internal arc 25 kA 1 s

Free-standing installation Classification IAC AFLR

Internal arc 25 kA 1 s

- Loss of Service Continuity

The various LSC categories of the standard define the possibility to keep other compartments and/or panels energized when open-ing a main circuit compartment.Gas-filled compartments cannot be opened, as they would then lose their functionality. Nevertheless, gas-insulated switchgear systems also receive a classification.

Key to table 5.1.2:

IAC Internal arc classificationAFLR Accessibility from the rear (R - rear) Accessibility from the sides (L - lateral) Accessibility from the front (F - front) Switchgear installed in closed rooms with access restricted to authorised personnel only

Table 5.1.3: Loss of Service Continuity of the switchgear

Systems without a switch-disconnector panel with fuses LSC2

Systems with at least one switch-disconnector panel with fuses LSC2A

Key to table 5.1.3:

LSC2: On access to the cable terminations of a panel, the busbar and all other panels can remain energized.LSC2A: On access to all accessible compartments of a panel (in this case cable termination and fuse box), the busbar and all other panels can remain energized.

Note from VDE 0671-200:2012-08 / IEC 62271-200 Edition 2.0:

„The LSC category does not describe ranks of reliability of switchgear and controlgear.“

The IAC qualification requires the switchgear installation to consist of at least two panels with pressure relief into the cable basement, and at least three panels with pressure relief into the switchgear room. 1)

1) Exception: At a reduced room height of 2.4 m the minimal switchgear system length must be 1,6 m (see section 10.4)


Partition class to IEC 62271-200

The partition class to IEC 62271-200 defines the nature of the par-tition between live parts and an opened, accessible compartment.

Key to table 5.1.4:

PM: partition of metal

Panels of partition class PM provide continuous metallic and earthed partitions between opened accessible compartments and live parts of the main circuit.

Table 5.1.4: Partition class in accordance with IEC 62271-200

Partition class PM


5.2 Technical data of the circuit-breaker

Table 5.2.1: Technical data of the circuit-breaker

Rated voltage / maximum operating voltage Ur kV 12 24

Rated power frequency withstand voltage 1) Ud kV 28 50

Rated lightning impulse withstand voltage 1) Up kV 75 125

Rated frequency 2) fr Hz 50

Rated normal current 3) Ir A ...1250

Rated short-circuit breaking current Isc kA ...25

Rated short-circuit making current Ima kA ...63



Operating sequence O - 0.3 s - CO - 3 min - CO 4)

Closing time tcl ms ca. 60

Rated opening time t3 ms ≤ 45

Rated break time tb ms ≤ 60

Rated auxiliary voltage V dc 60, 110, 220 5)

Power consumption of charging motor W max. 260

Power consumption of opening coil W max. 250

Power consumption of closing coil W max. 250

Power consumption of blocking magnet W 10

Power consumption of undervoltage release W 5

Permissible numbers of operating cycles of the vacuum interrupters

30000 x Ir (Ir = Rated normal current)

20 bis 50 x ISC (ISC = Rated short-circuit breaking current)

1) Higher levels to international standards on request2) Rated current for 60 Hz on request3) Higher operating currents on request4) Different operating sequences on request5) Different auxiliary voltages on request


Table 5.3.1: Technical data of the three position disconnector

Rated voltage / maximum rated voltage Ur kV 12 24

Rated power frequency withstand voltage across the isolating distance kV 32 60

Rated lightning impulse withstand voltage across the isolating distance kV 85 145


Rated peak withstand current Ip kA ...63


Rated auxiliary voltage Ua V dc 60, 110, 220 1)

Type: UX0-MT Type: UX0-ST

Rated normal current 2) A ...800 ...1250

Power consumption of mechanism motor W 200 120

Motor running time on opening or closing the disconnector 3) s 8 10

Motor running time on opening or closing the earthing switch 3) s 8 10

5.3 Technical data of the three position disconnector

1) Different auxiliary voltages on request2) Higher operating currents on request3) When a motor-operated mechanism is used4) At rated auxiliary voltage5) Three position switch-disconnector with HV HRC fuses: Observe the manufacturer’s specification for the maximum permissible let-through current of the fuses used (separate brochure for ABB-fuses or specification from Siba, 44534 Lünen, Germany).

Table 5.4.1: Technical data of the three position switch disconnector with or without HV HRC fuses

Rated voltage Ur kV 12 24

Rated power frequency withstand voltage across the isolating distance kV 32 60

Rated lightning impulse withstand voltage across the isolating distance kV 85 145

Rated normal current Ir A ...630

Rated mainly active local-breaking current (cos φ = 0.7) I1 A 630

Rated closed-loop breaking current (cos φ = 0.3) I2a A 630

Rated cable-charging breaking current (cos φ = 0.2) I4a A 50

Rated cable-charging breaking current I4a A 15

Rated line-charging breaking current I4b A 15

Rated short-circuit making current Ima kA 63 5)

Rated earth-fault breaking current I6a A 100

Rated cable-charging breaking current under earth-fault conditions I6b A 50

Rated short-time withstand current, 3 s Ik kA 25 5)

Rated auxiliary voltage 3) Ua V dc 60, 110, 220 1)

Power consumption of mechanism motor W 240

Motor running time on opening or closing the disconnector 4) s ≤ 3

5.4 Technical data of the three position switch disconnector with or without HV HRC fuses


Fuses from ABB - type CEF-TCU - and Siba (44534 Lünen. Ger-many) of 442 mm in length and a maximum diameter of 67 mm are used. Shorter fuses have to be fitted with a length adapter. The fuses have thermal protection. Tables 4.5.1.1 to 4.5.2.2 below show the assignment of transformer ratings to possible HV HRC fuse links. As the fuses are installed in a fuse box inside the panel, the operating current is limited to 60 % of the rated current of the fuse.

5.5 HV HRC fuses

5.5.1 Selection of HV HRC fuses, ABB

Table 5.5.1.1: Selection table for HV HRC fuses, ABB type CEF

Operating voltage Transformer Rating Relative impedance voltage uK

Rated transformer current Type

Rated current of the

HV-fuse

[kV] [kVA] [%] [A] [A]

10 ... 12

100 4 5.8

CEF-TCU

16

125 4 7.2 16

160 4 9.2 20

200 4 11.5 25

250 4 14.4 31.5

315 4 18.2 40

400 4 23.1 40

500 4 29.9 50

630 4 36.4 63

630 6 36.4 50

800 6 46.2 63

20 ... 24

100 4 2.9 10

125 4 3.6 10

160 4 4.6 16

200 4 5.8 16

250 4 7.2 20

315 4 9.1 20

400 4 11.5 25

500 4 14.4 31.5

630 4 18.2 40

630 6 18.2 31.5

800 6 23.1 40


Table 5.5.2.1: Selection table for HV HRC fuses, Siba (Ur up to 12 kV)

Operating Voltage

Transformer Rating

Relative impedance

voltage uK

Rated transformer current Rated current of the HV-fuse

[kV] [kVA] [%] [A] Type

min.

[A] Type

max.

[A]

6 ... 7.2

50 4 4.8

HHD-B

16

HHD-B

16

75 4 7.2 16 20

100 4 9.6 20 25

125 4 12 20 31.5

160 4 15.4 31.5 40

200 4 19.2 40 50

250 4 24.1 40 63

315 4 30.3 50 63

400 4 38.5 63 63

400 6 38.5 63 HHD-BSSK 80

10 ... 12

50 4 2.9 10

HHD-B

10

75 4 4.3 10 10

100 4 5.8 16 16

125 4 7.2 16 20

160 4 9.2 20 25

200 4 11.5 20 31.5

250 4 14.4 25 40

315 4 18.2 31.5 50

400 4 23.1 40 50

400 6 23.1 40 40

500 4 28.9 50 63

500 6 28.9 50

HHD-BSSK

63

630 4 36.4 63 80

630 6 36.4 63 80

800 6 46.2 HHD-BSSK 80 80

5.5.2 Selection of HV HRC fuses, Siba


Table 5.5.2.2: Selection table for HV HRC fuses, Siba (Ur from 13.8 to 24 kV)

Operating Voltage

Transformer Rating

Relative impedance voltage uK

Rated transformer current Rated current of the HV-fuse

[kV] [kVA] [%] [A] Typemin.

[A] Typemax.

[A]

13.8

75 4 3.1

HHD-B

10

HHD-B

10

100 4 4.2 10 10

125 4 5.2 16 16

160 4 6.7 16 20

200 4 8.4 20 20

250 4 10.5 20 25

315 4 13.2 25 31.5

400 4 16.7 31.5 40

400 6 16.7 31.5 31.5

500 4 20.9 40 50

500 6 20.9 40 40

630 4 26.4 50 63

630 6 26.4 50 50

800 6 33.5HHD-BSSK

63HHD-BSSK

63

1000 6 41.8 80 80

15 ... 17.5

75 4 2.9

HHD-B

10

HHD-B

10

100 4 3.8 10 10

125 4 4.8 16 16

160 4 6.2 16 16

200 4 7.7 20 20

250 4 9.6 20 25

315 4 12.1 20 31.5

400 4 15.4 31.5 40

400 6 15.4 31.5 31.5

500 4 19.2 40 50

500 6 19.2 40 40

630 4 24.2 40 63

630 6 24.2 40 40

800 6 30.8 50HHD-BSSK

63

1000 6 38.5 63 80

24

100 4 2.9 10

HHD-B

10

125 4 3.6 10 10

160 4 4.6 10 16

200 4 5.8 16 16

250 4 7.2 16 20

315 4 9.1 20 25

400 4 11.5 20 31.5

400 6 11.5 20 20

500 4 14.4 25 40

500 6 14.4 25 25

630 4 18.2 31.5 50

630 6 18.2 31.5 31.5

800 6 23.1 40 40

1000 6 28.9 50 HHD-BSSK 63


6 Fundamental structure of the panels

Modular structure

Each cable feeder panel consists of the gas-filled panel module (A), the cable termination compartment (B) and the low voltage compartment (C). The panel is fitted with a pressure relief com-partment (D).

Principle of block design

Several panel modules (2 to 6) form a single gas compartment which contains all the live high voltage parts. The side walls of

such a block are fitted with busbar sockets if the section extends beyond the limits of the block. Each block is equipped with a pressure relief system, a density sensor (temperature-compen-sated pressure sensor) or pressure gauge, and a filling valve. The maximum permissible width of a panel block is 2.40 m.

A complete switchgear installation can consist of several panel blocks (fig. 6.3). The busbars in the blocks are connected together at site by means of plug-in busbar connectors, without any gas work.

Fig. 6.1: Feeder panel 800 A with switch disconnector (example configura-tion)

Fig. 6.2: Feeder panel 1250 A with circuit-breaker (example configuration)

A

B

C

A

DB

C

Legend

Gas density sensor

Gas filling valve

Gas partition (plug-in bus-bar sockets)

Fig. 6.3: Gas diagram of a ZX0 switchgear installation consisting of 2 panel blocks with 7 panels (example configuration)

█ Insulating gas SF6

Block a Block b


1.0 Panel module (enclosure)1.1 Circuit-breaker pole1.2 Circuit-breaker mechanism1.3 Outer cone1.6 Socket for voltage transformer1.7 Isolating system for voltage transformer1.8a Voltage transformer, plug-in type1.8b Voltage transformer, fixed mounted1.9 Current transformer 1.10 Gas density sensor

1.11 Gas filling valve 1.13 Pressure relief disk1.14 Mounting plate2.1 Busbar system2.3 Three-position disconnector2.4a Manual operated three-position disconnector operating mechanism2.4b Motor operated three-position disconnector operating mechanism


Fig. 6.4: Panel module with circuit-breaker, 800 A, panel width 400 mm

The panel module (A)

The panel module essentially contains all the live high voltage parts, i.e. the switching devices, the busbars, sockets for voltage transformers and outer cones for connection of the high voltage cables. Busbar bushings may be located in the side walls of the panel modules. Current transformers and voltage transformers are located outside the panel modules.

The pressure relief disk (1.13) in the panel module may be located in the floor plate (panel width 400 mm) or in the rear wall of the enclosure (panel width 600 mm).

The seals of the components are o-ring seals which are not ex-posed to any UV radiation.

In a block consisting of several panels, the gas systems of the panel modules are connected together.

Three position disconnectors, circuit-breakers with three position disconnectors, switch disconnectors or switch disconnectors with HV HRC fuses can be used.

Panel module with circuit-breaker and three position dis-connector (figs. 6.4 and 6.5)

The circuit-breaker and the three position disconnector are in-stalled on a common mounting plate. The live parts of the switch-es are inside the panel module and the operating mechanisms are located in an easily accessible position outside the gas compart-ment.

Panel module with three position disconnector and op-tionally with fuses (figs. 6.6 and 6.7)

The live parts of the switch are inside the panel module and the operating mechanism is located in an easily accessible position outside the gas compartment. The optional fuses can be replaced without any gas work

Fig. 6.5: Panel module with circuit-breaker, 1250 A, panel width 600 mm

1.7

2.1

2.3

2.4b1.2

1.9

1.14

1.101.111.0

1.3

1.1

1.13

1.8b

1.8a

1.61.0

1.3

2.1

2.3

1.12.4a

1.2

1.9

1.13

1.14

1.101.11


1.0 Panel module (enclosure)1.3 Outer cone1.10 Gas density sensor 1.11 Gas filling valve1.13 Pressure relief disk1.15 Three position switch-disconnector

1.16 Three position switch-disconnector operating mechanism1.17 Fuse box1.18 Earthing switch2.1 Busbar system


Fig. 6.6: Panel module with switch-disconnector, 630 A Fig. 6.7: Panel module with switch-disconnector and fuses, max. 80 A

2.1

1.16

1.101.11

1.0

1.3

1.15

1.13

1.17

1.18

2.1

1.16

1.101.11

1.0

1.3

1.15

1.13


The cable termination compartment (B) and the pressure relief compartment (D)

The cable termination compartment and pressure relief com-partment (figs. 6.8 and 6.9) represent a galvanised sheet steel mounting structure for the panel. The mounting structure can be designed to support several panels, with the cable termination compartments in adjacent panels separated by steel walls.

The cable termination compartment contains the main earthing bar (3.5), the high voltage cables (3.2) with cable connectors (3.1) and cable fasteners (3.3), any current transformers required (1.9), op-tional surge arresters and the mechanism for the isolating device for voltage transformers.The cover of the cable termination compartment may optionally be

interlocked so that the cable termination compartment is only ac-cessible when the cables are earthed.

Discharge of pressure in the unlikely event of an internal arc fault in the cable termination compartment or the panel module can take place through the pressure relief compartment (4.0) to the rear into the switchgear room or downwards into the cable base-ment.

The cable termination compartment can be partitioned off from the cable basement by split floor plates around the cables. The cable termination compartment is safe to touch when appropriate cable connectors are used.

Fig. 6.8: Cable termination compartment (B) and pressure relief compart-ment (D), example configuration with fixed mounted voltage transformers with isolating devices, two cables per phase

1.8b Voltage transformers, fixed mounted1.9 Current transformers3.0 Cable termination compartment (B)3.1 Cable connector3.2 High voltage cable3.3 Cable fastener3.5 Main earthing bar 3.6 Floor plate (optional)3.7 Cover3.8 Mechanism for the voltage transformer isolating device (optional)4.0 Pressure relief compartment (D)

Fig. 6.9: Cable termination compartment (B) and pressure relief compart-ment (D), example configuration with one cable per phase

1.9

3.0

3.5

4.0

3.1

3.7

3.3

3.2

3.6

BD

1.9

B

3.5

1.8b

3.1

3.7

3.8

3.3

3.23.6

3.0


Fig. 6.10: Low voltage compartment

The low voltage compartment (C)

The operating mechanism for the circuit-breaker (1.2), the operat-ing mechanism for the three position disconnector (2.5) or the operating mechanism for the three position switch disconnector and sensors for gas density monitoring in the gas compartments (1.10), protection devices and further secondary equipment and wiring are located in the low voltage compartment..

The entry for external secondary cables (6.5) is located in the roof plate of the low voltage compartment.

Should a larger amount of secondary equipment be required, a low voltage compartment which is 150 mm taller can be supplied. The panel height is then 2250 mm.

1.2 Circuit-breaker operating mechanism1.10 Gas density sensor 1.11 Gas filling valve 1.14 Mounting plate for circuit-breaker2.5 Three position disconnector operating mechanism6.0 Low voltage compartment6.4 Wiring section6.5 Secondary cable entry6.6 Low voltage compartment door

6.4

2.5

6.0

1.101.11

1.2

6.5

1.14

6.6


7 Components

Fig. 7.2: Circuit-breaker panel, 1250 A, example configuration

2.3b

1.51.0

1.13

1.9

3.5

3.0

2.1

6.0

2.4b1.1

1.2

3.1

3.2

1.7

6.2

6.1

3.31.8

1.3

Fig. 7.1: Circuit-breaker panel, 800 A, example configuration

2.3a1.5

1.0

4.0

1.13

1.9

3.5

3.0

2.1

6.0

2.4a

1.1 1.2

3.1

3.3

1.3

3.2


1.0 Panel module1.1 Circuit-breaker pole1.2 Circuit-breaker operating mechanism1.3 Outer cone1.5 Measuring sockets for capacitive voltage indicator system1.7 Isolating system for voltage transformer1.8 Voltage transformer, fixed mounted1.9 Current transformer 1.13 Pressure relief disk1.15 Three position switch disconnector1.16 Three position switch disconnector mechanism2.1 Busbar system2.3a Three position disconnector (knife switch UX0-MT)2.3b Three position disconnector (rod-type switch UX0-ST)

2.4a Manually operated three position disconnector mechanism2.4b Motor operated three position disconnector mechanism3.0 Cable compartment3.1 Cable connector3.2 High voltage cable3.3 Cable fastener3.5 Main earthing bar4.0 Pressure relief compartment6.0 Low voltage compartment6.1 Central unit of a combined protection and control device6.2 Human-machine interface of a combined protection and control device


Fig. 7.3: Switch disconnector panel, example configuration

1.151.5

1.0

1.13

3.0

2.1

6.0

1.16

3.1

3.2

3.3

1.3

3.5

4.0


7.1 Vacuum circuit-breaker

The fixed mounted vacuum circuit-breakers (fig. 7.1.1) are three phase switching devices and fundamentally consist of the operat-ing mechanism and the three pole parts. The pole parts contain the switching elements proper, the vacuum interrupters.

The pole parts and the three position disconnector are located on a common mounting plate (fig. 7.1.3). The operating mechanisms for the circuit-breaker and three position disconnector are located on the opposite side of the mounting plate. The pole parts, three position disconnector, mounting plate and operating mechanisms thus form a single assembly unit. The mounting plate of this unit is bolted gas-tight to the front wall of the circuit-breaker compart-ment at the works.

The pole parts are located in the circuit-breaker compartment which is filled with SF6, and are therefore protected from external influences. The operating mechanism is located in the low voltage compartment and is therefore easily accessible.

Functions of the vacuum circuit-breaker

- Switching operating current on and off - Short-circuit breaking operations - Earthing function in conjunction with the three position disconnector

For earthing, the three position disconnector prepares the con-nection to earth while in the de-energized condition. Earthing proper is performed by the circuit-breaker. A circuit-breaker func-tioning as an earthing switch is of higher quality than any other earthing switch.

Vacuum interrupter

The outer casing of the vacuum interrupter (fig. 7.1.2) consists of ceramic insulators (1), whose ends are sealed off by stainless steel lids (2). The contacts (4 and 5) surrounded by the potential-free centre screen (3) are made of copper/chromium composite. As a consequence of the extremely low static pressure of less than 10-4 to 10-8 hPa inside the interrupter chamber, only a rela-tively small contact gap is required to achieve a high dielectric strength. The switching motion is transmitted into the enclosed system of the vacuum interrupter via a metal bellows (6). An anti-rotation element (7) is fitted to protect the metal bellows from torsion and to guide the conductor leading to the moving con-tact. The connection to the operating mechanism is effected by a threaded pin (8) fastened in the feed conductor.

If contacts through which current is flowing are opened in a vacuum, a metal vapour arc arises under short-circuit conditions. This arc creates the charge carriers required to conduct the cur-rent inside the vacuum interrupter. The arc is extinguished at the first natural zero of the alternating current after switch-off, i.e. after separation of the contacts. With the rapid reestablishment of the contact gap in the vacuum, the current flow is then securely inter-rupted.

2 1 4 2 7

3 5 6 8

Fig. 7.1.2: Vacuum interrupterFig. 7.1.1: Vacuum circuit-breaker below the three position disconnector


Pole parts (Fig 7.1.3)

The interrupter (9) inside the pole part is embedded in a cast resin pole tube (10). With the breaker closed, the current flows from breaker terminal (11) to the fixed contact in the vacuum interrupter, and from there via the moving contact to breaker terminal (12). The operating motions are effected by insulated actuating rods (13).

Circuit-breaker operating mechanism

The circuit-breaker operating mechanism (fig. 7.1.3, item 14) is connected to the pole parts via gas-tight thrust bushings (15).

The circuit-breaker is equipped with a mechanical stored-energy spring mechanism. The stored-energy spring can be charged either manually or by a motor. Opening and closing of the device can be performed by means of mechanical pushbuttons or by electrical releases (closing, opening and undervoltage releases).

The operating mechanism can be configured for autoreclosing and, with the short motor charging times involved, also for multi-shot autoreclosing.

Fig. 7.1.3: Pole part and circuit-breaker mechanism (at top of picture: three position dis-connector with operating mechanism)

11 10 9 12 13 15 14


The front of the operating mechanism (fig. 7.1.4) accommodates the mechanical on (1) and off (2) pushbuttons, the receptacle for manual charging of the stored-energy spring (3), the mechani-cal indicators for “Circuit-breaker ON” “Circuit-breaker OFF” (4), “Stored-energy spring charged”, “Stored-energy spring dis-charged” (5), an operating cycle counter (6) and the name plate for the circuit-breaker (7).

Fig. 7.1.4: Controls for the circuit-breaker operating mechanism

3

6

4

1

2

5

7


Table 7.1.1: Secondary equipment options for the circuit-breaker operating mechanism in relation to three position disconnector

mechanisms

IEC

des

igna

tion

VD

E-d

esig

natio

n

Eq

uip

men

tThree position disconnector mechanism

Man

ual

mec

hani

sm 1

1)

Mot

or-o

per

ated

mec

hani

sm 1

1)

Man

ual

mec

hani

sm 2

1)

Mot

or-o

per

ated

mec

hani

sm 2

1)

Sta

ndar

d

Op

tion

Sta

ndar

d

Op

tion

Sta

ndar

d

Op

tion

Sta

ndar

d

Op

tion

-MAS -M0 Charging motor for spring mechanism ● ● ● ●-BGS1 -S1 Auxiliary switch “Spring charged” ● ● ● ●

-MBO1 -Y2 Shunt release OFF ● ● ● ●-MBC -Y3 Shunt release ON ● ● ● ●-BGB1 -S3 Auxiliary switch “CB ON/OFF” ● ● ● ●-KFN -K0 Anti-pumping device ● ● ● ●

-RLE1 -Y1 Blocking magnet “CB ON” ● ● ● ● 2) ●-BGL1 -S2 Auxiliary switch for blocking magnet ● ● ● ●

-BGB4 -S7 Fleeting contact ≥ 35 ms for C.B. tripped indication ● ● ●

-MBU 3) -Y4 Undervoltage release ● ● ● ●-MBO3 3) -Y7 Indirect overcurrent release ● ● ● ●-MBO2 -Y9 2nd shunt release OFF ● ● ● ●

1) Three position disconnector mechanism see section 7.22) With control by RE_3) Combination of -MU with -MO3 is not possible

Secondary equipment for the circuit-breaker mechanism Table 7.1.1 shows the secondary equipment for the circuit-breaker operating mechanism in an outgoing feeder panel. The “Standard” column indicates the equipment necessary for control of the panel corresponding to the selected three position disconnector mecha-nism. Over and above this, the use of further devices such as additional auxiliary switches is possible as an option to meet your specific requirements.


The three position disconnectors are combined disconnectors and earthing switches. The three switch positions, connecting, disconnecting and earthing, are clearly defined by the mechanical structure of the switch. Simultaneous connection and earthing is therefore impossible.

Knife-switch or rod-type three position disconnectors are used. The switching components of the three position disconnector are located in the SF6-filled panel module, while the operating mecha-nism block is easily accessible in the low voltage compartment.

The three position disconnectors can be motor-operated or manu-ally operated. Emergency manual operation is always possible.

Fig. 7.2.3: Three position disconnector (UX0-ST) in disconnector ON posi-tion - circuit-breaker pole tubes at bottom of picture

486 7

Fig. 7.2.1: Three position disconnector (UX0-MT with actuating rods) in disconnector ON position - circuit-breaker pole tubes at bottom of picture

6 5 1 2 3 7

Fig. 7.2.2: Three position disconnector (UX0-MT with insulating spindle) in disconnector ON position - circuit-breaker pole tubes at bottom of picture

6 5 1 2 4 7

Knife-switch three position disconnector (UX0-MT) (figs. 7.2.1 and 7.2.2)

A conductor (1) embedded in the pole part of the circuit-breaker forms the base and pivot point (2) for the spring-loaded double knife contact (5), which is moved by link rods (3) or an insulating spindle (4). The disconnector contacts (6) are bolted to the pole part. The earthing contacts (7) are connected to the enclosure of the panel module by a common short-circuiting link.

Rod-type three position disconnector (UX0-ST) (fig. 7.2.3)

The switch has its disconnected position at the centre. In the dis-connector ON and earthing switch ON limit positions, the moving contact (slide (8)) driven by an insulating spindle (4) reaches the fixed contacts (disconnector contact (6) or earthing switch contact (7)) which are fitted with spiral contacts.

7.2 Three position disconnector


Three position disconnector operating mechanisms

The three position disconnectors are fitted with different operating mechanisms. The assignment of the three position disconnectors to the various mechanisms can be found in the following table.

Table 7.2.1: Assignment of three position disconnectors to

operating mechanisms

Three position disconnectorThree position disconnector

mechanism

UX0-MT with actuating rods Manual mechanism 1

UX0-MT with insulating spindle Motor-operated mechanism 1

UX0-ST

Manual mechanism 2

Motor-operated mechanism 1 and

motor-operated mechanism 2

Fig. 7.2.6: Motor-operated mechanism 1(behind the low voltage compartment door)

Manual mechanisms (figs. 7.2.4 and 7.2.5) are operated with the low voltage compartment door closed. The relevant opening (2) for insertion of a hand crank is exposed by turning a selector le-ver (3). The switch position is mechanically displayed (1). Manual mechanisms are mechanically interlocked with the relevant circuit-breaker to prevent maloperation.

Fig. 7.2.4: Controls of manual mechanism 1; view of the closed low voltage compartment door

Circuit-breaker controls

Fig. 7.2.5: Controls of manual mechanism 2 and motor-operated mecha-nism 2; view of the closed low voltage compartment door

The motor-operated mechanisms are operated by the control unit. Emergency manual operation of motor-operated mechanism 1 is possible when the low voltage compartment door is open, whereas motor-operated mechanism 2 can be operated manually from the outside with the low voltage compartment door closed. Motor-operated mechanism 2 is equivalent to manual mechanism 2. But it is equipped with an additional drive motor to operate the three position disconnector, and is mechanically interlocked with the circuit-breaker. Motor-operated mechanism 1 is electrically interlocked with the circuit-breaker.

The operating mechanism block of the motor-operated mecha-nism 1 consists of the following functional groups (fig. 7.2.6):

4 Drive motor5 Position detection with micro switches6 Mechanical position indicator 7 Mechanical access interlock for emergency manual operation

123

2

13

Circuit-breaker controls

765 4


1) When shunt release ON –MBC is used in the circuit-breaker operating mechanism

Table 7.2.2: Secondary equipment options for the three position disconnector operating mechanism variants in a feeder panel

IEC

des

igna

tion

VD

E d

esig

natio

n

Eq

uip

men

tThree position disconnector operating mechanism

Man

ual

mec

hani

sm 1

1)

Mot

or-o

per

ated

mec

hani

sm 1

1)

Man

ual

mec

hani

sm 2

1)

Mot

or-o

per

ated

mec

hani

sm 2

1)

Sta

ndar

d

Op

tion

Sta

ndar

d

Op

tion

Sta

ndar

d

Op

tion

Sta

ndar

d

Op

tion

-MAD -M1 Drive motor ● ●

-BGI15 -S15 Microswitch to detect switch position “Disconnector OFF” ●

-BGI16 -S16 Microswitch to detect switch position “Disconnector ON” ●

-BGE57 -S57 Microswitch to detect switch position “Earthing switch OFF” ●

-BGE58 -S58 Microswitch to detect switch position “Earthing switch ON” ●

-BGI1 -S11 Auxiliary switch “Disconnector OFF” ● ● ●

-BGI1 -S12 Auxiliary switch “Disconnector ON” ● ● ●

-BGI5 -S51 Auxiliary switch “Earthing switch OFF” ● ● ●

-BGI5 -S52 Auxiliary switch “Earthing switch ON” ● ● ●

-BGL1

-BGL2

-S151

-S152

Microswitch for (optional) access blocking of hand crank receptacle

for emergency manual operation● 1) ● ● ●

-RLE1 -Y1 Blocking magnet disconnector ● ● ●

-RLE5 -Y5 Blocking magnet earthing switch ● ● ●

Secondary equipment for the three position disconnectoroperating mechanism

Table 7.2.2 shows the secondary equipment for the three position disconnector operating mechanism in an outgoing feeder panel. The “Standard” column indicates the equipment necessary for control of the panel corresponding to the selected three position disconnector operating mechanism. Over and above this, the use of further devices such as additional auxiliary switches is possible as an option to meet your specific requirements.


The three position switch disconnectors represent a combination of a switch disconnector and an earthing switch. The three switch positions, connecting, disconnecting and earthing, are unequivo-cally defined by the mechanical structure of the switch. Simultane-ous connecting and earthing is therefore precluded.

Knife-type three position switch disconnectors are used. The switching elements (1) of the three position switch disconnectors are located in the SF6-filled panel module. The disconnector con-tact (2) of the three position switch disconnector is fitted with a quenching plate system (3). This consists of cooling plates which split the arc into short partial arcs connected in series. The rees-tablishment of the contact gap after extinction of the arc at the current zero is supported by the cooling of the arc.

The operating mechanism block is located in the low voltage com-partment and is therefore easily accessible. The mechanism for the switch is designed as a snap action spring mechanism, and the switching velocity is therefore independent of the speed at which the mechanism is operated.

The switch disconnector function can be motor-operated or manu-ally operated. Emergency manual operation is always possible. The earthing switch function is always manually operated.

Options for secondary equipment on the mechanism can be found in table 7.3.1.

Table 7.3.1: Secondary equipment options for the three position switch disconnector operating mechanism

IEC

des

igna

tion

VD

E d

esig

natio

n

Eq

uip

men

t

Sta

ndar

d

Op

tion

-MAS -Q0M0 Motor drive ●

-BGI1 -Q0S3 Auxiliary switch “switch disconnector ON/OFF ●




-BGE1 -Q8S1 Auxiliary switch “earthing switch ON/OFF“ ●




-BGS1

-BGS2

-Q0S1Limit switch for motor control of switch disconnector ●

-Q0S2

-MIO1 -Q0Y2 Shunt release OFF ●

-RLE3 -Q0Y1 Blocking magnet earthing switch ●

-RLE4 -Q8Y1 Blocking magnet switch disconnector ●

-BGL3 -Q8S5 Auxiliary switch for blocking magnet earthing switch ●

-BGL4 -Q0S5 Auxiliary switch for blocking magnet switch disconnector ●

-BGL5 -Q8S151 Auxiliary switch “selector slide position earthing switch” ●

-BGL6 -Q0S151 Auxiliary switch “selector slide position disconnector” ●

Fig 7.3.1: Three position switch disconnector in disconnector ON position

7.3 Three position switch disconnector

123


The three position switch disconnectors with fuses are a combina-tion of a switch disconnector (1.15), an earthing switch, an HV HRC fuse and an cable earthing switch (1.18). The structure is in principle equivalent to that of the three position switch disconnec-tor (section 6.3).

The HV HRC fuses are located in the fuse box (1.17) below the switch disconnector, in air at atmospheric pressure. A flap in front of the fuse box lid (1.19) is blocked when the feeder is not earthed. Blown fuses can therefore only be replaced when the feeder is earthed. The additional cable earthing switch ensures that HV HRC fuses are also earthed on the cable side. Operation of the cable earthing switch is effected positively when the earthing switch in the three position switch disconnector is operated.

Options for secondary equipment on the mechanism can be found in table 7.4.1.

Fig. 7.4.1: Three position switch disconnector with fuse (see also Fig. 6.7)

1.15

1.17

1.19

1.18

7.4 Three position switch disconnector with fuse

Table 7.4.1: Secondary equipment options for the three position switch disconnector operating mechanism with fuse

IEC

des

igna

tion

VD

E d

esig

natio

n

Eq

uip

men

t

Sta

ndar

d

Op

tion

-MAS -Q0M0 Motor drive ●









-BGS1

-BGS2

-Q0S1

-Q0S2Limit switch for motor control of switch disconnector ●

-MIO1 -Q0Y2 Shunt release OFF ●

-RLE4 -Q0Y1 Blocking magnet switch disconnector ●

-RLE3 -Q8Y1 Blocking magnet earthing switch ●

-BGF -F1S1 Auxiliary Switch “HV HRC fuse blown” ●

-BGL3 -Q8S5 Auxiliary switch “blocking magnet eartjing switch” ●

-BGL4 -Q0S5 Auxiliary switch “blocking magnet switch disconnector” ●

-BGL5 -Q0S151 Auxiliary switch “selector slide position earthing switch” ●

-BGL6 -Q8S151 Auxiliary switch “selector slide position switch disconnector” ●


The busbars, located in the gas compartment of the panel blocks, are connected together by plug-in busbar connectors (figs. 7.5.1 to 7.5.3). The busbar connection consists of the cast resin busbar socket (1) mounted in the busbar compartment from the inside, the silicone insulating part (2), the contact tube (3) and the spiral contacts (4).

The electrically conductive connection from the embedded part of the cast resin busbar socket to the contact tube is established by two spiral contacts, depending on the rated busbar current. The silicone insulating part isolates the high voltage potential from earth potential. The surfaces of all electrically conductive compo-nents (embedded part, spiral contact and contact tube) which are accessible from the outside are silver plated. As the contact tubes

are axially movable, no further compensation for expansion in the busbars running through a switchgear system is necessary.

The plug connector system on the one hand facilitates the delivery of blocks tested at the works for leakage and dielectric strength, and on the other hand no gas work during installation at site is necessary.

End panels

End panels can be supplied in versions prepared for extension. In these versions, the busbar sockets are sealed off with dielectrically safe blanking plugs. If extension of the system is not required or impossible, end panels without busbar sockets are supplied.

Fig. 7.5.1: Busbar socket (1) with insulating part (2), contact tube (3) and spiral contacts (4)

Fig. 7.5.2: Busbar connection, plugged in at one end Fig. 7.5.3: Busbar connection, plugged in at both ends

1

2

3

4

7.5 Busbar


Outer cone device termination components to EN 50180 and EN 50181, fitted gas-tight in the wall between the panel module and the cable termination compartment, facilitate connection of cables and surge arresters (figs. 7.6.1 to 7.6.2). The termination height of 700 mm provides for good accessibility when installing cables. When the shutter on the cable termination compartment has been removed, the cables are accessible from the front of the system.

Furthermore, at operating voltages of up to 12 kV and operating currents of up to 630 A, connection of plastic-insulated cables (35 mm2 - 400 mm2) and paper-insulated cables (50 mm2 -

400 mm2) is possible using an insulated cable termination (type RCAB 12 kV) from manufacturer Tyco. This cable termination (fig. 7.6.3) is not shockproof. When this termination system is used, the cover on the cable termination compartment should be lock-able.

Apart from this, always use shockproof termination systems where possible. where possible. A selection of various shockproof con-nector systems which can be installed depending on the space available can be downloaded here. When making your selection, please observe the current and short-circuit ratings of the cables and connector systems. Please consult the manufacturers’ latest catalogues for the precise ordering data and information on any couplings or termination elements required.

Fig. 7.6.2: View from the front into the cable termination compartment in air, with cable connectors (ABB - type SOC 630 ...) and cables

7.6 Outer cone termination system

Fig. 7.6.3: Cable termination RCAB 12 kV from Tyco during installation. The cable termination at the right (L3) is completely assembled.

Fig. 7.6.1: View into the cable termination compartment in air, without cable plugs during assembly at the works

https://search.abb.com/library/Download.aspx?DocumentID=1VBA680500P0102%20EN%20(list)&LanguageCode=en&DocumentPartId=&Action=Launch


LRM-system (Fig. 7.9.1)

– Additional indicator unit (Fig. 7.9.2) required – Repeat testing necessary

KVDS-system (Fig. 7.9.3)

– LC-Display – Three phase – No additional indicator unit required – Maintenance-free with integrated self-test:

– No symbol visible: – De-energized – Half lightning arrow displayed:

Voltage applied – Full lightning arrow displayed:

Voltage applied and self-test passed

Fig. 7.9.1: Three phase LRM system

Fig. 7.9.2: Indicator unit for LRM-systems

Fig. 7.9.3: KVDS-system

Surge arresters are fitted directly with cable connectors. Fitting of several cables plus a surge arrester per phase is possible (see tables 7.6.1 and 7.6.2). The terminals of the surge arresters must be suitable for the type of cable connector used. Further informa-tion on surge arresters can be obtained from the relevant cable connector manufacturer.

7.7 Surge arresters

7.8 Main earthing bar

7.9 Capacitive voltage indicator systems

The main earthing bar of the switchgear system runs through the cable termination compartments of the panels. The earthing bars in the individual panels are connected together during installation at site.

The cross-section of the main earthing bar is 240 mm2 (ECuF30 30 mm x 8 mm).

Details on earthing the switchgear can be found in section 10.7.

Various capacitive, low impedance voltage indicator systems are available for checking of the off-circuit condition of a feeder. The coupling electrode is integrated in the outer cone device termina-tion components. The capacitive voltage indicator system is lo-cated in the low voltage compartment door.

All systems used are voltage dectection systems (VDS) according to IEC 61243-5.

All the systems used permit phase comparison with the aid of an additional, compatible phase comparator.


CAVIN-system (Fig. 7.9.4)

As the KVDS-system, but:

– Two integrated relay contacts for signals/interlocks

– LED display of relay status: – No Error: Relay 1 closed (All three

conductors have the same voltage state and auxiliary voltage is available.)

– Error: Relay 1 open (The three conductors are carrying different voltages, or the auxiliary voltage has failed.)

– HV OFF: Relay 2 closed (UL1 = UL2 = UL3 < phase to earth voltage when the response voltage is reached.)

– HV ON: Relay 2 open (In at least one phase, U / √3 > phase to earth voltage when the response voltage is reached, or auxiliary voltage has failed.)

– Auxiliary voltage required for the relays

Table 7.9.1: Scope of function of the capacitive voltage indicator systems

Sys

tem

Tech

nica

l cha

ract

eris

tics

Ad

diti

onal

ind

icat

or u

nit

req

uire

d

LC-d

isp

lay

Inte

grat

ed s

elf-

test

Two

rela

y co

ntac

ts

Aux

iliar

y vo

ltage

req

uire

d f

or

rela

ys

LRM

Three phase Low impedance

●KVDS ● ●CAVIN ● ● ● ●

Fig.. 7.9.4: CAVIN-system


The areas of application for current and voltage detection devices are

– Protection applications, – Measurement, – Billing metering.

Ring core current transformers are used for feeder metering in termination panels. They are located on the outer cone outside the gas compartment.The winding of the ring core current transformer is enclosed in cast resin. The cross-section of the connecting wiring is 2.5 mm² (larger cross-sections on request).The possible technical data can be found in the following table.

Table 7.10.1.1: Technical data of the ring core current transformers

Current transformer type 1 2

Rated voltage Ur kV 0.72 0.72

Rated short duration power-frequency withstand voltage Ud kV 3 3

Rated frequency fr Hz 50 / 60

Rated thermal short-time current Itherm 25 kA - 3 s

Rated impulse current Ip kA 62.5

Panel width mm 400 600

Rated primary current Ir A ...800 ...1250

Rated secondary current A 1 or 5

Max number of cores 1 2

Core data 1)

Measuring coresCapacity VA - 2,5 to 15

Class - 0.2 / 0.5 / 1

Protection cores

Capacity VA 1 to 10 2.5 to 15

Class 5P to 10P

Overcurrent factor 10 to 20

Abb. 7.10.1.1: Ring core current transformer

1) Dependent on rated primary current.

7.10 Current and voltage detection devices

7.10.1 Ring core current transformers


The stipulations and recommendations of IEC 61936, section 6.2.4.1 “Current transformers” and IEC 61869-2 are to be ob-served in the design of current transformers. The rated overcurrent factor and rated burden of current transformer cores are to be selected in such a way that protection devices can function cor-rectly and measuring systems are not damaged in the event of a short-circuit.

Protection purposes

Protection cores are, logically, operated at above rated current. The function of the selected protection system is essentially deter-mined by the connected current transformer. The requirements to be fulfilled by the current transformers for the selected protection or combination device can be found in the documentation from the protection equipment supplier. For an accurate switchgear proposal, these current transformer data are to be provided with the product enquiry and then finally agreed by the operator and manufacturer in the order.

The direct path to the right current transformers is via the techni-cal documentation of the selected protection device. The current transformer requirements of the relay can be found there.

Measuring purposes

In order to protect measuring and metering devices from damage in the case of a fault, they should go into saturation as early as possible. The rated burden of the current transformer should be approximately the same as the operating burden consisting of the measuring instrument and cable. Further details and designations can be found in IEC 61869-2.

Recommendations

In principle, we recommend a rated secondary current of 1 A. The current transformer ratings for ABB protection devices are known. The transformer data can be selected to suit the protection appli-cation and the network parameters. If, however, third party devices are to be connected, we recommend a review by our engineers at an early stage. Taking account of the burdens and overload capacities, our experts can examine the entire current transformer requirements of the third party protection devices on request.

Further information for different protection systems

If the current transformers to be used in the network concerned (e.g. on the opposite side of the network) have already been speci-fied, early coordination of the switchgear configuration is advisable. This requires, but is not limited to, the provision of data on the ratio, rated capacity, accuracy class, and the resistance of the second-ary winding and secondary wiring. Further configurations for the particular application can then be requested.

7.10.2 Dimensioning of current transformers


Fig. 7.10.3.2: Voltage transformer for fixed mounting

The voltage transformers are always located outside the gas com-partments. They can be of the plug-in type (plug size 2 to DIN 47637 and EN 50181) or permanently mounted. Plug-in voltage transformers can be removed for testing purposes. Fixed mount-ed voltage transformers are always fitted with a series isolating device.

The possible electrical data can be found in the table below.

Fig. 7.10.3.1: Voltage transformer, plug-in type

7.10.3 Voltage transformers

Table 7.10.3.1 Technical data of voltage transformers

Type of

voltage

transformer

Max. capacity Class

Rated secondary

voltage of the

metering winding

Rated secondary

voltage of the earth

fault winding

Rated thermal current limit

of the metering winding

with rated voltage factor

1.2 / continuous

Rated thermal long duration

current of the earth fault

winding with rated voltage

factor 1.9 / 8 h

[VA] [V] [V] [A] [A]

plug-in type

15 0.2100 / √3

110 / √3

100 / 3

110 / 34 445 0.5

90 1

fixed mounted

20 0.2100 / √3

110 / √3

100 / 3

110 / 36 650 0.5

100 1

Table 7.10.2.2: Rated power frequency withstand voltage of voltage transformers

Rated voltage Rated power frequency withstand voltage (1 min)

[kV] [kV]

< 6 5 x Ur

6 - 12 28

> 12 - 17.5 38

> 17.5 - 24 50


7.11 Protection and control units

ABB provides the right protection and automation solution for every application.Table 7.11.1 below provides an overview of the most important protection devices with notes on their range of applications. Fur-ther information can be obtained in the Internet (http://www.abb.de/mediumvoltage) or from the responsible ABB contact for you.

1) For manually operated three position disconnector

Table 7.11.1: Application of protection and control units

Uni

t d

esig

nitio

n

Application Communication protocol

Feed

er p

rote

ctio

n

Met

erin

g p

anel

Cap

acito

r b

ank

pro

tect

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IEC

618

50

IEC

608

70-5

-103

Mod

bus

DN

P 3

.0

Main

protection

REF630 ● ● ● ● ● ●REM630 ● ● ● ● ●RET630 ● ● ● ● ● ●REG630 ● ● ● ● ●REF620 ● ● ● ● ● ●REM620 ● ● ● ● ● ●RET620 ● ● ● ● ● ● ●REF615 ● ● 1) ● ● ● ●RED615 ● ● ● 1) ● ● ● ●REM615 ● ● 1) ● ● ● ●RET615 ● ● 1) ● ● ● ●REU615 ● ● ● ● 1) ● ● ● ●REV615 ● ● 1) ● ● ● ●

Backup

protection

REF611 ●REM611 ● ● REB611 ● ● ● ● ●REF610 ● REM610 ● ● ● ●REU610 ● ●


This product contains Sulphur hexafluoride (SF6). 1)

SF6 is a non-toxic, inert insulating gas with high dielectric strength and thermal stability.

Its unique electrical and thermal properties have made the design of new, more efficient switchgear possible. The change from con-ventional insulation to the non-flammable, chemically inactive and non-toxic heavy gas sulphur hexafluoride has led to significant savings in space and materials, and to greater safety of the instal-lations. Switchgear systems insulated with sulphur hexafluoride have become highly successful especially in applications where space is constricted and compact design is required. On account of their insensitivity to air pollution, enclosed SF6 systems are also used in the chemicals industry, in desert areas and at coastal locations. Thanks to SF6 technology, new substations can also be erected at load centres in densely populated areas where high land prices prohibit other solutions.

SF6 has been used in HV-switchgear since 1960.

Fig. 7.13.1: Gas filling connector

7.12 Sulphur hexafluoride

7.13 Gas system in the panels

SF6 is used as the insulation medium. Furthermore, SF6 is used as the quenching gas in panels with switch disconnector and fuses for interruption of operating currents.

The gas compartments are designed as hermetically sealed pres-sure systems. As they are filled with SF6, constant ambient condi-tions are permanently ensured for the entire high voltage area of the panel. It is not necessary to top up the insulating gas during

the expected service life of the system. Under normal operating conditions, no checks on the insulating gas are necessary. The insulating gas is maintenance-free.

Each panel module has a gas filling connector (fig. 7.13.1 - see also section 6), through which the panel modules can be filled with gas, for instance in the case of repairs.

The service pressure of the individual gas compartments is moni-tored by separate density sensors (temperature-compensated pressure sensors, fig. 7.13.2) or by pressure gauges (when no control voltage is available). A fall below the alarm level for insula-tion in a gas compartment (120 kPa) is displayed on the protec-tion and control unit or by a signal lamp. Temporary operation of the panels at atmospheric pressure (> 100 kPa) is possible in prin-ciple when the SF6 content of the insulating gas is at least 95 %. (Exception: The minimum filling pressure for switching in panels with three position switch disconnectors is 120 kPa).

Leakage testing of the gas compartments during manu-facturing process

The leakage rate of the gas compartments is determined by inte-gral leakage testing:Inside a pressure test cabin, following evacuation of the gas com-partments, the panel is filled with helium. The leakage rate of the gas compartments is determined by measurement of the propor-tion of helium in the test cabin. The helium is then recovered as the gas compartments in the panel are evacuated again. There-after, the gas compartments are filled with insulating gas at the rated filling pressure.A successful leakage test is therefore the necessary condition for filling of the systems with insulating gas.

1) SF6 is a fluorinated greenhouse gas with a GWP of 22800. The maximum quantity per block of panels is 11 kg. That corresponds to a CO2 equivalent of 251 t. Each block has a gas leakage monitor, and therefore regular leakage testing (to Fluorinated Gas Regulation 517/2014) is not required.

Fig. 7.13.2: Density sensor


7.14 SF6 density sensor

Fig. 7.14.1 shows the function of the SF6 density sensor. Between the measuring chamber and a reference chamber there is a mov-ing mounting plate which operates electrical contacts.

Temperature compensation

The pressure in the monitored gas compartment rises with in-creasing temperature. As, however, the temperature in the refer-ence chamber and thus the pressure of the reference volume increases to the same extent, this does not lead to any movement of the mounting plate.

Self-supervision

A drop in pressure of the reference volume results in a movement of the mounting plate (to the right in fig. 7.14.1). The self-supervi-sion contact is operated. As the system is designed as a closed circuit, both wire breakages and defective plug and terminal con-nections are signalled as faults.

1 2 4

3

6

5

Abb. 7.14.1: Schematic diagram of the function of the SF6 density sensor

Gas losses

A loss of gas in the monitored gas compartment results in a drop in pressure in the measuring volume and thus a movement of the mounting plate (to the left in fig. 7.14.1). The contact for the pres-sure loss signal is operated.

The circuit diagram for the density sensor is shown in fig. 7.14.2.

< 120 kPa

> 120 kPa< 150 kPa

> 150 kPa

Abb. 7.14.2: Circuit diagram for the density sensor

Gas loss Self-supervision

1 Monitored gas compartment2 Measuring volume3 Enclosed volume for temperature compensation (reference volume)4 Mounting plate moved by interaction of forces (pressure of measuring volume against pressure of reference volume)5 Contact for self-supervision (p > 150 kPa 1) )6 Contact for gas loss (p < 120 kPa 2) )


In the unlikely event of an internal arc fault in a gas compartment, the relevant pressure relief disk opens. There is one pressure relief disk within each block (see also section 6).

Wall mounting installation

Pressure relief is to the rear into the switchgear room (figs. 7.15.1 and 7.15.2) or into the cable basement (fig. 7.15.3).

Free-standing installation

Pressure relief is via a duct at the rear into the switchgear room (fig. 7.15.4).

Fig. 7.15.1: Wall mounting installation: Pressure relief into the switchgear room, panel width 400 mm

Fig. 7.15.2: Wall mounting installation: Pressure relief into the switchgear room, panel width 600 mm

7.15 Pressure relief systems

7.16 Surfaces

The gas-tight enclosures of the panel modules consist of stainless steel sheets and the cable termination compartments and low voltage compartments are manufactured from galvanised sheet steel.The low voltage compartment doors, the cable termination com-partment covers, end covers and the rear duct required for free-standing installation are coated with a powder stove enamel in RAL 7035 (light grey). Other colours for the painted parts are avail-able on request.

Fig. 7.15.4: Free-standing installation: Pressure relief into the switchgear room, panel width 600 mm

Abb. 7.15.3: Wall mounting installation: Pressure relief into the basement, panel width 400 mm

(without bottom plate in the cable termination compartment)


The following panel variants are available:

– Incoming and outgoing feeder panels as – Circuit-breaker panels – Switch disconnector panels and

Switch disconnector panels with fuses – Cable termination panels – Section panels as

– Circuit-breaker panels – Switch disconnector panels

8 Range of panels

8.1 Feeder panels

Fig. 8.1.1.1: Outgoing feeder panel with circuit-breaker 800 A Fig. 8.1.1.2: Outgoing feeder panel with circuit-breaker 800 A

Fig. 8.1.1.3: Circuit-breaker panel, 1250 A, voltage transformer (isolatable in the off-circuit condition) on the cable

Fig. 8.1.1.4: Circuit-breaker panel, 1250 A, voltage transformer (isolatable in the off-circuit condition) on the cable and plug-in type voltage trans-former connected to the busbar

850

2100

1)

850

2100

1)

1000

2100

1)

1000

2100

1)

8.1.1 Incoming and outgoing feeder panels with circuit-breaker

1) Extended height of 2250 mm for larger amount of secondary equipment

– Risers – Metering panels – Customised panel versions

All the panels shown in section 8 are - unless otherwise stated - available as versions for free-standing and wall mounting installation. All the illustrations show the wall-mounting versions.


Table 8.1.1.1: Overview of variants for incoming and outgoing feeder panels with circuit-breaker

Panel width: 400 mm

Panel depth: 850 mm

Ur:

Ir:

Ip:

... 24 kV

... 800 A

... 25 kA

Panel width: 600 mm

Panel depth: 1000 mm

Voltage transformers: optional

Ur:

Ir:

Ip:

... 24 kV

... 1250 A

... 25 kA

Max. 3 cablesper phase

Max. 3 cables per phase + surge arrester

Only possible in panel width 600 mm

Only possible in panel width 600 mm

Voltage transformer, plug-in type

Voltage transformer, isolatable


8.1.2 Feeder panels with three position switch disconnector

Fig. 8.1.2.1: Feeder panel with three position switch disconnector

Max. 2 cables per phase + surge arrester

850

2100

1)


Table 8.1.2.1: Overview of variants for feeder panels with three position switch disconnector

Panel width: 400 mmPanel depth: 850 mm

Ur:

Ir:

Ip:

... 24 kV

... 630 A

... 25 kA


8.1.3 Feeder panels with three position switch disconnector and fuse

Fig. 8.1.3.1: Feeder panel with three position switch disconnector and fuses, max. 80 A 2)

One cable per phase

Voltage transformer,fixed mounted

850

2100

1)

1) Extended height of 2250 mm for larger amount of secondary equipment2) See tables 4.5.1 to 4.5.3: Selection table for HV HRC fuses

Table 8.1.3.1: Overview of variants for feeder panels with three position switch disconnector

Panel width: 400 mm

Panel depth: 850 mm

Voltage transformer: optional

Ur:

Ir:

Ip:

... 12 kV

... 80 A 2)

... 25 kA

..24 kV

...63 A 2)

...25 kA


8.1.4 Cable termination panels

Fig. 8.1.4.1: Cable termination panel 800 A,panel width: 400 mm

Fig. 8.1.4.1: Cable termination panel 1250 A,panel width: 600 mm

only possible in panel width 600 mm

Voltage transformer, plug-in type

Three position discon-nector fitted in panel width 600 mm

Max. 3 cablesper phase

Max. 2 cablesper phase + surge arrester

850

2100

1)

1000

2100

1)

1) Extended height of 2250 mm for larger amount of secondary

Table 8.1.4.1: Overview of variants for cable termination panels

Panel width: 400 mm

Panel depth: 850 mm

Ur:

Ir:

Ip:

... 24 kV

... 800 A

... 25 kA

Panel depth 600 mm

Panel width: 1000 mm

Ur:

Ir:

Ip:

... 24 kV

... 1250 A

... 25 kA


8.2 Busbar sectionaliser and riser panels

A sectionaliser and a riser panel are required for the implementa-tion of bus couplings.

Bus couplings can be integrated in a switchgear block. The cou-pling connections are effected using plug-in busbar sockets, i.e. the gas systems of the sectionaliser and riser panels are segre-gated.

Couplings between two system blocks can be effected by means of cables.

8.2.1 Couplings within a switchgear block

Fig. 8.2.1.1: Sectionaliser with three position switch disconnector, 630 A Fig. 8.2.1.1: Sectionaliser with circuit- breaker, 800 A

Fig. 8.2.1.3: Sectionaliser with circuit-breaker, current transformers and voltage transformers, 1250 A

Fig 8.2.1.4: Riser panel with current transformers and voltage transformers, 800 A

850

2100

1)

85021

00 1)

1000

2100

1)

850

2100

1)


Sectionaliser panels can be fitted with a three position switch disconnector or a combination of circuit-breaker / three position disconnector. Various options are available for the installation of current and voltage transformers.Riser panels may contain a three position switch, current trans-formers and/or voltage transformers.The installation variants “sectionaliser left – riser right” and vice versa are possible.



Current transformer

Voltage transformer upstream or downstream from the current transformer

1)

Current transformer

Voltage transformer upstream or downstream from the current transformer

Current transformer


Table 8.2.1.1: Overview of variants for sectionaliser and riser panels for installation within a switchgear block, panel width: 2 x 400 mm

Panel width: 2 x 400 mm

Panel depth: 850 mm

Ur:

Ir:

Ip:

... 24 kV

... 630 A (panel with switch-disconnector)

... 800 A (panel with circuit-breaker)

... 25 kA

1) Gas partition (plug-in busbar sockets)


1) Current and voltage transformers cannot be fitted above and below the three position disconnector at the same time. The riser panel cannot accommodate two sets of current transformers or two sets of voltage transformers. 2) Current transformers can only be equipped in conjunction with voltage transformers.3) Gas partition (plug-in busbar sockets)

Table 8.2.1.2: Overview of variants for sectionaliser and riser panels for installation within a switchgear block, panel width: 2 x 600 mm

Panel width: 2 x 600 mm

panel depth: 1000 mm

Ur:

Ir:

Ip:

... 24 kV

... 1250 A

... 25 kA

3)

Voltage transformer,

isolatable 1)

Currenttransformer 1) 2)

Current transformer 1)


8.2.2 Couplings (Connection of two system blocks)

Fig. 8.2.2.1: Couplings by cables, example configuration with circuit-breaker, three position disconnectors and integrated busbar voltage measurement, 1250 A

The overview of variants can be found in section 8.1.

1000

2100

1)

1000



8.3 Metering panels

Metering panels are fitted with voltage transformers and/or current transformers. Voltage measurement before current measurement and vice versa are possible. Voltage transformers in metering pan-els are fixed mounted and isolatable.

Fig. 8.3.1: Metering panel, busbar current: 1250 A

850

2100

1)


Table 8.3.1: Overview of variants for metering panels

Panel width: 400 mm

Panel depth: 850 mm

Ur:

Ip:

... 24 kV

... 25 kA


8.4 Busbar earthing panel

Earthing of the busbar in this panel variant is effected by a switch disconnec-tor.

Fig. 8.4.1: Busbar earthing panel

850

2100

1)


Table 8.4.1: Overview of variants for busbar earthing panel

panel width: 400 mm

panel depth: 850 mm

Ur:

Ip:

... 24 kV

... 25 kA


8.5 Design to order panels

The panel variants presented in sections 8.1 to 8.4 are standard panels. Should you require panel variants which are not listed there when planning your switchgear, please contact the ABB office responsible for your area. Our design team will be pleased to submit and implement technical proposals to fulfil your require-ments.

IAC-qualification according to IEC 62271-200 of special panels may not be possible in all cases.

Fig. 8.5.1: Example of a design to order panel: Ring main panel with a com-mon gas compartment, a common low voltage compartment and a common cable compartment, version with three circuit-breaker panels (24 kV, 25 kA, 630 A), wall mounting installation

Fig. 8.5.2: Example of a design to order panel: Panel with additional cable terminations at the side (viewed from the rear, without cable plugs), wall mounting installation

1300

1950


With the feeder earthed, the cable connectors can be fitted with an earthing set connected to the main earthing bar. The earthing sets considered suitable by the cable connector manufacturer for the type of connector concerned are to be used. The busbar

is earthed via the closed feeder disconnector and closed circuit-breaker downstream (see fig. 9.1.1). Earthing can also be effected similarly via a switch disconnector panel with cable termination.

Fig. 9.1.1: Busbar earthing by earthing set

Fig. 9.2.1: Busbar earthing by sectionaliser and riser

Earthing set

9 Busbar earthing

9.1 Earthing the busbar by means of an earthing set

This section outlines the ways in which the busbar can be earthed. The details of these operations can be found in the relevant in-struction manuals. 9.2 Earthing the busbar by

means of a sectionaliser and riser or bus coupler

Earthing is effected by the three position disconnector and the circuit-breaker in a bus sectionaliser (see fig. 9.2.1).


The switchgear can be installed

– on a concrete floor, or – on a raised false floor.

Concrete floor

If the switchgear installation consists of several panel blocks, a foundation frame set into the floor topping is required. The founda-tion frame ensures that the necessary evenness and straightness tolerances at the base of the switchgear system are maintained. The foundation frame can be supplied by ABB. If the switchgear installation consists of a single panel block (without plug-in busbar connections), no foundation frame is required.Floor openings for power cables can be configured as cutouts for each panel, as continuous cutouts (one each for power and con-trol cables) or as drill holes. The floor openings are to be free from eddy currents (drill holes for power cables three phase – without ridges in between).

False floor

Below the switchgear, the supporting sections of the raised floor serve as a base for the panels. A foundation frame is not as a rule necessary. The floor panels must be fixed to the supporting frame of the false floor.

Pressure stress on the switchroom

With pressure relief inside the switchroom or to the cable base-ment, a pressure rise in the room can be expected in the – highly unlikely – event of an internal arc fault. This is to be taken into account when planning the building. The pressure rise can be cal-culated by ABB on request. Pressure relief openings in the switch-room may be necessary.

Construction materials

When selecting suitable construction materials, you should comply with any applicable national regulations. We fundamentally recom-mend non-flammable materials of class A2 to EN 13501-1.

Ventilation of the switchroom

Lateral ventilation of the switchroom is recommended.

Service conditions

The service conditions according to IEC 62271-1 for indoor switchgear are to be ensured.

The ambient air is not significantly polluted by dust, smoke, corro-sive and/or flammable gases, vapours or salt.

The conditions of humidity are as follows:

– the average value of the relative humidity, measures over a period of 24 h, does not exceed 95 %;

– the average value of the water vapour pressure, over a period of 24 h, does not exceed 2.2 kPa;

– the average value of the relative humidity, over a period of one month, does not exceed 90 %;

– the average value of the water vapour pressure, over a period of one month, does not exceed 1.8 kPa.

Heaters are to be fitted in the low voltage compartments to pre-clude condensation phenomena (outside the gas-tight enclosures) resulting from major rapid temperature fluctuations and corre-sponding humidity. The specified temperature conditions accord-ing to IEC 62271-1 (> -5 ° Cr > - 25 °C for panels without auxiliary voltage) are also to be ensured by means of room heating.

10 Building planning

10.1 Site requirements


10.2 Space required

The switchgear can be installed at a small distance from the switchgear room wall at the rear, or as a free-standing unit in the room:

1. Wall mounting installation

2. Free-standing installation

The following conditions are to be fulfilled in planning the position of a switchgear installation in the switchgear room:

a) Fulfilment of IEC 61936 standard in connection with an escape route width of no less than 500 mm behind and to the side of the switchgear system.

b) Fulfilment of IEC 61936 standard in connection with an aisle width of no less than 800 mm in front of the switch gear system. Under certain conditions, the aisle width has to be increased as set out in Table 10.3.

c) Fulfilment of IEC 62271-200 standard in connection with a minimum distance of 800 mm between the rear of the switchgear system and the wall of the building behind it in the case of free-standing installation, and a distance of 800 mm at one side of switchgear system and 100 ± 30 mm at the other side.

Explanatory note:

As a rule the distance between the switchgear system and the building wall may be 100 ± 30 mm on one side, either right or left. For reasons concerning installation methods, a distance of 100 ± 30 mm on both sides is not possible. The distances of 800 mm for free-standing installation mentioned above at the rear and side of the switchgear system result from the requirement in the standard for 500 mm deep mounting racks with indicators 300 mm from the test specimen (the switchgear system). If the dimension on installation of the system is less than 800 mm, no statement may be made as to the safe accessibility of the system in the areas concerned. The standardized designation IAC-AFLR does not then in clude the L (for lateral arc fault testing) and/or R (for arc fault testing at the rear).

d) Conditions imposed by the design.

Re 1. Wall installation

The switchgear system must be designed to be positioned at a small distance from the wall of the switchgear room. A specified dimension of 1100 mm from the front edge of the switchgear sys-tem to the wall of the switchgear room behind the system is the result, when panels of 600 mm width are used; when only panels of 400 mm width are used, this dimension is 950 mm. Greater dimensions are not permissible, as the end covers at the sides of the switchgear system will then not be flushed with the building wall – and the conditions for safety in the case of internal arc faults are not fulfilled.

Re 2. Free-standing

For an internal arc classification of IAC-AFLR, the switchgear system must have a distance of 800 mm between the rear walls of the panels and the wall of the switchgear room. If the distance is reduced to one which merely fulfils the condition for an escape route (escape route width no less than 500 mm), it cannot be stated that the switchgear system is safe at the rear in the case of internal arc faults.

The following illustrations show examples of installation dimen-sions for ZX0.2 switchgear systems.


10.2.1 Space required for wall mounting installations

Fig. 10.2.1.1: Wall mounting installation: Example of a single row installation (Top view, dimensions in mm)

1) 950 mm if only panels of 400 mm width are used2) End cover3) Recommended minimum door height: Panel height (2100 mm or 2250 mm) + 150 mm4) Recommended dimension (permitted reduction in accordance with section 10.3)5) Pay attention to section 10.3 concerning emergency possibilities6) The width of the escape route can be reduced to 500 mm with a corresponding reduction in the IAC qualification as per table 10.3.1. IEC 62271-200 provides for a distance of 300 mm between the indicators and the panel for arc fault testing. According to the standard, the frame with the mountings for the indicators has a depth of 500 mm, resulting in a minimum distance of 800 mm between the panels and the wall. With smaller distances, therefore, no statements can be made on accessibility at the side of the switchgear system. A minimum escape route width of 500 mm is recommended in IEC 61936.

Fig. 10.2.1.2: Wall mounting installation: Example of a double row installation (Top view, dimensions in mm)

> 1

100

4)

> 800 6)

50 2)

> 1

150

3)

1100

1)

50 2)

> 100 5)

> 100 5) > 800 6)

> 1

700

4)11

00 1)

50 2) 50 2)

> 1

150

3)


Fig. 10.2.2.1: Free-standing installation, Example of a single row installation (Top view, dimensions in mm)

> 100 4) > 800 5)

> 1

700

3)11

8580

0 5)

50 1) 50 1)

> 1

150

2)

Fig. 10.2.2: Free-standing installation, Example of a double row installation (Top view, dimensions in mm)

> 8

00 5)

> 1

100

3)

> 800 5)

50 1)

> 1

150

2)

1185

50 1)

> 100 4)

Operator side

1185

800

5)

1) End cover2) Recommended minimum door height: Panel height (2100 mm or 2250 mm) + 150 mm3) Recommended dimension (permitted reduction in accordance with section 10.3)4) Pay attention to section 10.3 concerning emergency possibilities5) The width of the escape route can be reduced to 500 mm with a corresponding reduction in the IAC qualification as per table 10.3.1. IEC 62271-200 provides for a distance of 300 mm between the indicators and the panel for arc fault testing. According to the standard, the frame with the mountings for the indicators has a depth of 500 mm, resulting in a minimum distance of 800 mm between the panels and the wall. With smaller distances, therefore, no statements can be made on accessibility at the side of the switchgear system. A minimum escape route width of 500 mm is recommended in IEC 61936.

Operator side

10.2.2 Space required for free-standing installations


10.3 Minimum aisle widths and emergency exits

Table 10.3.1: IAC qualification on reduction of escape route widths to the minimum of 500 mm

Escape route width at the side of the

switchgear system

[mm]

Escape route width behind the

switchgear system

[mm]

IAC - classification

Wall mounting installation > 800 - AFL

> 500 - AF

Free standing installation

> 800 > 800 AFLR

> 800 > 500 AFL

> 500 > 800 AFR

> 500 > 500 AF

Table 10.3.2: Limiting conditions on minimizing the aisle width in front of the switchgear

Minimum aisle width

(without door holders, doors close in the

direction of the emergency exit)

[mm]

Recommended aisle width

[mm]

Single row installation

Panel block, exclusively consisting of

panels of 400 mm width> 800 > 900

Panel block with at least one 600 mm

wide panel> 800 > 1100

Minimum aisle width

[mm]

Recommended aisle width

[mm]

Two row installation

(with operator aisle

between the blocks)

Panel block, exclusively consisting of

panels of 400 mm width> 1000 > 1300

Panel block with at least one 600 mm

wide panel> 1400 > 1700

The aisle width in front of the switchgear is to be planned with at-tention to the need to remove panels from or insert panels into ex-isting rows, and to the requirements of the relevant standards (see IEC 61936 and IEC 62271-200). The minimum and recommended minimum aisle widths can be found in tables below.

“Aisles shall be at least 800 mm wide. ... Space for evacuation shall always be at least 500 mm, even when removable parts or open doors, which are blocked in the direction of escape, intrude

into the escape routes. ... Exits shall be arranged so that the length of the escape route within the room ... does not exceed

… 20 m. ... If an operating aisle does not exceed 10 m, one exit is enough. An exit or emergency possibilities shall be provided at both ends of the escape route if its length exceeds 10 m. ... The minimum height of an emergency door [possibly the 2nd door] shall be 2 000 mm [clear height] and the minimum clear opening 750 mm.” 1)

1) IEC 61936


10.4 Minimum room heights

1) At a switchgear system length of min. 1.6 m and pressure relief as shown in figure 7.15.1 and 7.15.2.2) Only necessary in one panel of a panel block when the pressure is discharged into the cable basement (cf. section 6.14).

Table 10.4.1: Minimum room heights

Rated short-time

withstand current Ik Duration of short-circuit Panel height

Minimum room height for

IAC - classification

[kA] [s] [mm] [mm]

Pressure relief into the

switchroon

≤ 25

1

2100 2700

2250 2850

≤ 212100

2400 1)

2250

Pressure relief into

the cable basement≤ 25

2100no requirements

2250

10.5 Floor openings

Fig. 10.5.1: Openings for primary cables and pressure relief, panel width 400 mm

Fig. 10.5.2: Openings for primary cables, panel width 600 mm

40320

400

850

156

8138

012

0

1000

412

120

600

470 65

Outlines of the panel

Opening for pressure re-lief into the cable base-ment 2)

Opening for primary cables


Fig. 10.6.4: Foundation frame, type for all panels of 600 mm width

Fig. 10.6.1: Foundation frame, type for feeder panels, panel width 400 mm

1) Panel depth

Fig. 10.6.3: Foundation frame, type for all panels of 600 mm width

Fig. 10.6.2: Foundation frame, type for metering and sectionaliser panels, panel width 400 mm

10.6 Foundation frames

Standard foundation frames are designed for single panels. The foundation frames are to be selected to suit the relevant panel types. The foundation frames are fastened to the concrete floor and em-bedded in the floor topping.

When installing the foundation frame at site, observe the form and position tolerances stated in the order documents.

400

40 320

120

380

850

1)

816

20

400

850

1)

816

20

600

65 470

120

412

1000

1)

966

20

600


59 282

20 560

60

280

107 186 214 386

400 600

965

814

624

529

4020

252,

5

11

12

M 8 or

bore hole

20

1000

850

10.7 False floor

Fig. 10.7.1 is an aid to planning of the false floor.

The floor plates of the panels have L 11 x 12 slots for fastening the panels to the frame sections. Provide M 8 threads or bore holes for screws M 8 in the frame sections at the positions of the slots.

Fig. 10.7.1: Example of a false floor in the area of a four-panel ZX0 switch-gear system as an aid to planning (plan view, dimensions in mm).

– L11 x 12 slot in the floor plate of the panel – M 8 thread or bore hole for screw M 8 in the frame

section of the false floor

Detail A

Outline of the panel

A


The earthing system for the station building and the earthing sys-tem for the switchgear are to be designed in accordance with IEC 61936.

The switchgear system is to be fitted with a continuous copper earthing bar with a cross-section of 240 mm2 (ECuF30, 30 mm x 8 mm). The connection of this earthing bar to the station earthing system is to be effected in accordance with the above standards.

10.8 Earthing of the switchgear

10.8.1 Design of earthing systems with regard to touch voltage and thermal stress

10.8.2 EMC-compliant earthing of the switchgear

Observe IEC 61000-5-2 and IEC 61000-6-5 to project the earth-ing system of the station building and the design, laying and con-nection of external control cables.

Establish the switchgear earthing due to the guidelines in the fol-lowing section.


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2

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8 A A

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10.8.3 Recommendation on configuration of the switchgear earthing

Fig. 10.8.3.2: Earthing recommendation, plan view (section A-A of figure 10.8.3.1)

Fig. 10.8.3.1: Earthing recommendation, shown schematically as a sectional elevation of the lower part of a panel including the concrete floor

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We recommend that the switchgear be earthed as shown in fig-ures 10.8.3.1 and 10.8.3.2. A ring consisting of 80 mm x 5 mm copper strip is to be located beneath the switchgear and connected at several points with a maximum spacing of 5 m to the earthing system of the building. The foundation frame and the main earthing bar in the panels are to be connected at multiple points to the ring located beneath

the switchgear. Details on the use of materials and the number of connections can be found in figure 10.8.3.1 and 10.8.3.2.


1 Ring below the switchgear, material ECuF30, cross-section 80 mm x 5 mm2 Several connections from (1) to the building earth at distances of max. 5 m, material ECuF30, cross-section 80 mm x 5 mm3 Short-circuit proof earthing of the switchgear in both end panels and at least every third panel, material: ECuF30, cross-section: 30 mm x 8 mm4 Low impedance earthing of the switchgear in each panel, material: tinned copper braid, cross-section: 20 mm x 3 mm5 Earthing of the foundation frame, at least every third foundation frame, material: galvanised steel strip, cross-section: 30 mm x 3.5 mm6 Outline of the panel 7 Foundation frame8 Main earthing bar9 Earthing point on the foundation frame

Legend to figures 10.8.3.1 and 10.8.3.2

10.9 Panel weights

Table 10.9.1: Panel weights

Panel variantsPanel width

[mm]

Rated normal current

[A]

Weight, max

[kg]

Feeder panel with circuit-breaker400 ...800 300

600 ...1250 600

Feeder panel with three position

switch disconnector400 ...800 225

Feeder panel with three position

switch disconnector and fuse400 ...800 280

Sectionaliser panel400 ...800 390

600 ...1250 600

Riser panel400 ...800 335

600 ...1250 550

Metering panel (gas-insulated) 400 300

Busbar earthing panel 400 195


11 Non-standard operating conditions

Non-standard operating conditions may require special action. Our design team will be pleased to submit and implement techni-cal proposals to fulfil your requirements.

The non-standard operating conditions include in particu-lar

– Site altitudes > 1000 m above sea level (Higher site altitude on request),

– Higher ambient air temperature (maximum > 40 °C and maximum 24 h average > 35 °C) (see fig. 11.1),

– Ambient air contaminated by dust, smoke, corrosive or flammable gases or salt.

Ambient air temperature / °C

Cur

rent

car

ryin

g ca

paci

ty /

A

Fig. 11.1: Relationship between ambient air temperature and current carrying capacity

Panels with Ir = 1250 A at 40 °CPanels with Ir = 1000 A at 40 °CPanels with Ir = 800 A at 40 °CPanels with Ir = 630 A at 40 °C

-5 0 5 10 15 20 25 30 35 40 45 50 55

1600

1400

1200

1000

800

600

400

Seismic withstand cabability

Seismic resistant panels according to IEEE Std. 693 are available on request.

Climate

With high humidity and/or major rapid temperature fluctuations, electrical heaters must be fitted in the low voltage compartments.

For your notes

1VB

68

05

00

P0

102

RE

V 16

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anu

ary

2020

—We reserve the right to make technical changes or modify the contents of this document without prior notice. With re-gard to purchase orders, the agreed par-ticulars shall prevail. ABB AG does not ac-cept any responsibility whatsoever for potential errors or possible lack of infor-mation in this document.

We reserve all rights in this document and in the subject matter and illustrations con-tained therein. Any reproduction, disclo-sure to third parties or utilization of its contents – in whole or in parts – is forbidden without prior written consent of ABB AG.

Copyright© 2008 ABBAll rights reserved

—ABB AGOberhausener Str. 33D-40472 RatingenDeutschland

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