Simulation of Single-phase to Ground Fault to Anticipate Against the Sympathetic Tripping Phenomena

Abstract

Simulation of single-phase to ground fault (1Φground

fault) to anticipate against the sympathetic tripping phenomena have been done. Results include are the current value of single-phase to ground fault and capacitive current and the value of adjustment current of Ground Fault Relay (GFR) is 0.5 amperes (10% of the value of the ratio of current transformer in term of the secondary side) for all feeders, the selected time setting of GFR is 0.30, and Time Multiplier Setting of Ground Fault Relay values obtained for all feeders is 0.15 (rounded from 0.11). The largest current value occurred in a location 25% length of the line for all feeders. It was influenced by the value of reactance as the denominator value, the smaller the percentage of length of the line, the greater the value of the fault current. The value of adjustment current was obtained at 0.5 amperes and working time of Ground Fault Relay not more than 0.4 seconds.