21 7ut6 family en
DESCRIPTION
Transformer ProtectionTRANSCRIPT
Power Transmission and Distribution
Differential Protection 7UT6
Presentation
PTD PA 7UT6 Present 11/04 No. 2
The 7UT6 Family
7UT612: for two end protection objects (1/3 x 19’’ housing 7XP20)7UT613: for three end protection objects (1/2 x 19’’ housing 7XP20) 7UT633: for three end protection objects (1/1 x 19’’ housing 7XP20)7UT635: for five end protection objects (1/1 x 19’’ housing 7XP20)
SIPROTEC 47UT6 differential protection relay for transformers,generators, motors and busbars
PTD PA 7UT6 Present 11/04 No. 3
Hardware options
7UT612
7 (7)*1---34 14 lines
7UT613
11 (6)*1**3 / 15 814 lines
7UT633
11 (6)*1**3 / 121 241Graphic
Device
Current Inputs (normal)
Current Inputs (sensitive)
Voltage Inputs (Uph / UE)
Binary InputsBinary OutputsLife contact LC Display
7UT635
14 (12)* 2**---29 241 Graphic
* 1A, 5A, (1A, 5A, 0.1A) changeable (jumper position)
** changeable normal or sensitive (jumper position)
PTD PA 7UT6 Present 11/04 No. 4
Scope of functions and Protection objects
Function ANSI No.
Differential 87T/G/M/L
Restricted Earth fault 87 N
Overcurrent-time, phases 50/51
Overcurrent-time, 3I0 50N/51N
Overcurrent-time, earth 50G/51G
Overcurrent-time, single phase
Negative sequence 46
Overload IEC 60255-8 49
Overload IEC 60354 (hot spot) 49
Overexcitation V/Hz 24
Breaker failure 50BF
External temperature monitoring 38
Lockout 86
Measured value supervision
Trip circuit supervision 74TC
Direct coupling
Operational measured values
Protection Objects
Three-phase transformer
Single-phase transformer
Auto-transformer
Generator / Motor
Busbar, 3-phase (Branch point)
Busbar, 1-phase
PTD PA 7UT6 Present 11/04 No. 5
Cross reference - functions and protected objects
XXXXXXOperational measured values
XXXXXXDirect coupling 2
XXXXXXDirect coupling 1
XXXXXX74TCTrip circuit supervision
XXXXXXMeasured value supervision
XXXXXX86Lockout
XXXXXX38External temperature monitoring(thermo-box)
---XXXXX50 BFBreaker failure
XXXXXX24Overexcitation V/Hz *)
---XXXXX49Overload IEC 60354
---XXXXX49Overload IEC 60255-8
---XXX---X46Negative sequence
XXXXXXOvercurrent-time, single phase
XXXXXX50G/51GOvercurrent-time, earth
---XXX---X50N/51NOvercurrent-time, 3I0
---XXXXX50/51Overcurrent-time, phases
------X---XX87 NRestricted Earth Fault
XXXXXX87T/G/M/LDifferential
Busbar1-phase
Busbar3-phase
Gen. /Motor
Auto-transf.
Transf.1-phase
Transf.3-phase
ANSI No.Protection functions
X Function applicable ; --- Function not applicable ; *) only 7UT613 / 633
PTD PA 7UT6 Present 11/04 No. 6
Communication features
Front interfaceDIGSI4
WEB Monitor
Service interface (s)DIGSI4 operation
modem connection
RTD box
Flexibility due to plug in modulesCompatibility to international standards
System interfaceIEC60870-5-103
Profibus FMS
Profibus DP
DNP3.0
Modbus ASCII/RTU
Time synchronisingIRIG-B (GPS)
DCF77
RS232/RS485 electrical module
Fibre-optic module
Optical double-ring module
PTD PA 7UT6 Present 11/04 No. 7
Connection Example
direct connection to themain Ct’s
no matching transformers /no matching connections
numerical vector groupadaptation without zero sequence current correctiondepending of the type ofearthing of the winding.
increased sensitivity by 33%by measuring of the zerosequence current (7UT6) forsingle-pole faults.
1A/5A main Ct’s adaptationin the relay
permissible ratio Ct nominalcurrent to transformer nominalcurrent up to 1 : 4
IL2M1
IL1M3
IL2M2
IL3M2
IL2M3
IL3M1
IL3M3
IL1M2 IL1M1IX1 IX3
7UT613
M1
M3
M2 side 1side 2
side 3
Surfacemountinghousing
Flush/cubicle-mountinghousing
L1
L2
L3
L1
L2
L3
L1
L2
L3
PTD PA 7UT6 Present 11/04 No. 8
Commissioning and operating aids (1 of 4)
WEB-Technology
The homepage of the relayis:http://141.141.255.160IP-address is set with DIGSI 4on front- or rear service port
WEB server in the relays firmware
Server sends it’s HTML-pages and JAVA-code to the WEB Monitorafter a DIAL-UP connection
2. HTML page view in a WEB Monitorwith the IP-address of the relayhttp://141.141.255.160
Help system in INTRANET / INTERNEThttp://www.siprotec.com
1. Serial connectionDirect or via modem with a standard DIAL-UP Network
Access to the relay with a WEB Monitor
PTD PA 7UT6 Present 11/04 No. 9
Commissioning and operating aids (2 of 4)
Transformer YNd11d11, 110/11/11kV, 38.1MVA, IL2S2? wrong polarity
PTD PA 7UT6 Present 11/04 No. 10
Commissioning and operating aids (3 of 4)
Transformer YNd11d11, 110/11/11kV, 38.1MVA, IL2S2? wrong polarity
PTD PA 7UT6 Present 11/04 No. 11
Commissioning and operating aids (4 of 4)
PTD PA 7UT6 Present 11/04 No. 12
Protection relay with flexible adaptation to the transformer/generator/motoror short line. Programming of the device data in the relay.
Reduced amount of wiring by direct connection to the main Ct’s.No matching transformers and therefore no wiring errors.
Zero sequence current can be measured (in the 7UT6).Sensitivity for single-pole faults in the transformer increased by 33% .
Flexible adaptation of the tripping characteristic to various main Ct’s, tapped transformers.
Exact discrimination between the short circuit condition and the inrushcondition by on-line analysis of the harmonics. Fast tripping for high-current faults. Ct saturation detector for external faults.
Thermal monitoring of one transformer winding (including RTD meas.)
Back-up DMTL/IDMTL with reverse blocking for one winding.
Sensitive short circuit protection for faults winding against earth.
External Trip functions
Various commissioning aids.
Common DIGSI 4 software
Benefits for the Customer
PTD PA 7UT6 Present 11/04 No. 13
Comparison of functions/settingsbetween 7UT51- and 7UT6 relays
3030303080Transformer inrush: Default setting for 5. harmonic [%]
XXXX---All functions can be enabled at the same time
33330Transformer inrush: Default setting for cross block 2. harmonic [cycles]
XXXX---High impedance Restricted Earth Fault
---XX------Over excitation protection [V/Hz]
---XX------Voltage measurements
XXXX---Single phase busbar differential
XXXX---Temperature monitoring (via Thermo-box / RS 485)
XXXX---Negative sequence current protection
XXXX---Overload protection IEC 60354 (hot spot)
XXXX---WEB monitor (commissioning aid)
XXX------Tripping Characteristic: Increasing of characteristic due to DC offset in IDiff
1111½Tripping Characteristic: slope of add-on stabilization / slope 1
XXX------Tripping Characteristic: cross block for add-on stabilization
22225Tripping Characteristic: minimum setting for add-on stabilization I/InO
XXXX---Tripping Characteristic: Increasing of characteristic at start
XXXX---Tripping Characteristic: Base point for slope 1 settable
7UT635
7UT633
7UT613
7UT612
7UT51