Toshiba GR-200-5 Instruction Manual

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6F2T0207 (0.01)vii2.4.4 Reset Ratio.............................................................................................................................. 782.4.5 Miscellaneous functions......................................................................................................... 782.4.6 Setting for Petersen coil earthed system.............................................................................. 792.4.7 Setting of standby earth-fault ............................................................................................... 802.4.8 Scheme logic ........................................................................................................................... 802.4.9 Setting ..................................................................................................................................... 832.4.10 Signal ...................................................................................................................................... 88Negative sequence overcurrent protection (OCN) ...................................................................... 902.5.1 Relay polarity ......................................................................................................................... 902.5.2 Inverse time and definite time delay characteristic ............................................................ 922.5.3 Threshold value ...................................................................................................................... 982.5.4 Reset Ratio.............................................................................................................................. 982.5.5 Miscellaneous functions......................................................................................................... 982.5.6 Scheme logic ........................................................................................................................... 992.5.7 Setting ................................................................................................................................... 1012.5.8 Signal .................................................................................................................................... 106Undercurrent protection (UC) .................................................................................................... 1082.6.1 Operation and characteristic............................................................................................... 1092.6.2 Miscellaneous functions....................................................................................................... 1092.6.3 Scheme switch ...................................................................................................................... 1092.6.4 Setting ....................................................................................................................................1112.6.5 Signal .................................................................................................................................... 112Switch on to fault (SOTF-OC) .................................................................................................... 1132.7.1 Scheme logic ......................................................................................................................... 1132.7.2 Setting ................................................................................................................................... 1152.7.3 Signal .................................................................................................................................... 115Broken conductor protection (BCD) ........................................................................................... 1162.8.1 Equivalent circuit for a one-phase series fault .................................................................. 1172.8.2 Characteristic and setting ................................................................................................... 1192.8.3 Miscellaneous functions....................................................................................................... 1192.8.4 Scheme logic ......................................................................................................................... 1202.8.5 Setting ................................................................................................................................... 1212.8.6 Signal .................................................................................................................................... 121Thermal overload function (THM) ............................................................................................. 1222.9.1 Thermal state determination .............................................................................................. 1232.9.2 Thermal characteristic ........................................................................................................ 1242.9.3 Scheme logic ......................................................................................................................... 1252.9.4 Setting ................................................................................................................................... 1262.9.5 Signal .................................................................................................................................... 126