Toshiba GR200 Series Instruction Manual page 6

Contents
Introduction ............................................................................................................................................ 1
1
Configuration ................................................................................................................................... 2
Protection functions ........................................................................................................................ 7
Recording function .......................................................................................................................... 7
Metering function ............................................................................................................................ 7
Summary of GRB200 ...................................................................................................................... 9
Symbols used in logical diagrams ................................................................................................ 10
Abbreviation .................................................................................................................................. 14
Function Block (FB), Function ID, Signal number (Data ID) .................................................... 16
Relay application .................................................................................................................................. 18
2
Current differential protection (DIF) ........................................................................................... 19
Check-zone-protection and Discriminating-zone-protection ............................................... 19
2.1.1
Selection of protection-characteristic ................................................................................... 24
2.1.2
Stabilization for CT saturation with through-fault current ............................................... 25
2.1.3
Current transformer requirements ...................................................................................... 27
2.1.4
DIF slope settings .................................................................................................................. 28
2.1.5
Protection for respective zones (DIFCH, DIFZA to DIFZF) ................................................ 30
2.1.6
Blind zone protection ............................................................................................................. 36
2.1.7
CT circuit failure detection (Open circuit) ........................................................................... 38
2.1.8
Supervision of differential current (DIF-IdSV) ................................................................... 42
2.1.9
Setting ..................................................................................................................................... 44
2.1.10
Signal (DataID) ...................................................................................................................... 45
2.1.11
Circuit breaker failure protection (CBF) ..................................................................................... 52
Detecting the failure of circuit breakers .............................................................................. 53
2.2.1
Protection scheme .................................................................................................................. 53
2.2.2
Scheme logic and setting ....................................................................................................... 56
2.2.3
CBF operation by faults occurrence...................................................................................... 65
2.2.4
Setting ..................................................................................................................................... 69
2.2.5
Signal (Data ID) ..................................................................................................................... 70
2.2.6
Fail safe (FS) .................................................................................................................................. 96
Under-voltage element for phase-to-earth voltage (UVFS) ................................................ 97
2.3.1
Under-voltage element for phase-to-phase voltage (UVSFS) ............................................. 97
2.3.2
Under-voltage change detection element (UVDFS) ............................................................ 97
2.3.3
Scheme logic ........................................................................................................................... 97
2.3.4
Setting ................................................................................................................................... 100
2.3.5
Signal (Data ID) ................................................................................................................... 101
2.3.6
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6F2S1931 (0.20)