Analisa Gangguan Satu Fasa Ke Tanah Yang Mengakibatkan Sympathetic Trip Pada Penyulang Yang Tidak Terganggu Di PLN APJ Surabaya Selatan

Abstract

Twenty kilovolts power distribution network system at East Java use high resistance (500 ?) grounding system that makes maximum single phase to ground fault current 25 Amperes. To detect this fault current, a Directional Ground Relay (DGR) is used. If a single phase to ground fault occurrs on Semolo feeder, then Gebanglor feeder and Srikana feeder which are supplied by the same bus with Semolo feeder (Nissin bus) will also trip (sympathetic trip). Sympathetic trip is caused by the total leakage current of arresters, transformers and low voltage panels on Gebanglor feeder dan Srikana feeder which is more than 2 Amperes (tap current setting of DGR is 2 Amperes). After maintenance, the total leakage current of the arresters on Gebanglor feeder is 0.046 Amperes and Srikana feeder is 0.026 Amperes