Toshiba GR200 Series Instruction Manual page 7

Setting DIFL accounting for CT ratio/rating and fault currents ............................................. 55
Nature of CT ratios matching ............................................................................................. 55
2.5.1
Nature of CT ratings matching ........................................................................................... 56
2.5.2
Nature for fault current setting .......................................................................................... 56
2.5.3
DIFL operations for 1.5CB arrangement .................................................................................. 59
Through-fault-current encountered by DIF (TFC in DIFL and DIFGL) .......................... 59
2.6.1
Settings in TFC ................................................................................................................... 67
2.6.2
Data IDs in TFC .................................................................................................................. 67
2.6.3
Stub protected by DIFL (Stub-DIFL) ................................................................................. 68
2.6.4
Settings in Stub ................................................................................................................... 70
2.6.5
Data ID in Stub ................................................................................................................... 71
2.6.6
DIFL applied to double circuit line with a fault (Fault current outflowing) .................... 72
2.6.7
DIFL applied to three-terminal line (RDIF and Fault current flowing) .................................. 73
Remote different trip ........................................................................................................... 73
2.7.1
Setting .................................................................................................................................. 80
2.7.2
Data ID ................................................................................................................................ 80
2.7.3
Nature of outflowing current in case of internal fault ....................................................... 82
2.7.4
Nature of CT saturation in case of external fault .............................................................. 83
2.7.5
DIFL applied to protect the blind zone ...................................................................................... 84
Stub protection with overcurrent relay (STUB-OC) ................................................................. 86
Stub-OC characteristic ........................................................................................................ 87
2.9.1
Scheme logic ........................................................................................................................ 87
2.9.2
Setting .................................................................................................................................. 89
2.9.3
Data ID ................................................................................................................................ 90
2.9.4
Distance protection (ZS/ZG) ....................................................................................................... 91
Principle of distance measurement .................................................................................... 92
2.10.1
Equations in distance protection function .......................................................................... 96
2.10.2
Element characteristic in distance relay .......................................................................... 103
2.10.3
Common application for ZS and ZG ................................................................................... 117
2.10.4
Command protection feature ............................................................................................ 124
2.10.5
Extended application ......................................................................................................... 129
2.10.6
Scheme logic ...................................................................................................................... 132
2.10.7
Tips to set the main/remote backup relays ...................................................................... 148
2.10.8
Tips to set the distance zones for multi-terminal lines .................................................... 152
2.10.9
ZS/ZG test ....................................................................................................................... 154
2.10.10
Setting ............................................................................................................................ 155
2.10.11
Data ID ........................................................................................................................... 171
2.10.12
Direct transfer trip (DTT) ........................................................................................................ 180
Setting for the operation ................................................................................................... 181
2.11.1
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6F2S1914 (0.49)