STUDI KERJA PROTEKSI RELAI OCR DAN GFR PADA PENYULANG ULUWATU SETELAH REKONFIGURASI

Abstract

PT. PLN (Persero) South Bali Area built the Pecatu GIS to level the load, improve service
and reliability of the electricity distribution system. The transfer of electrical loads to the Pecatu
GIS changes the configuration of the Pecatu feeder to the Uluwatu feeder and the Labuan Sait
feeder. Changes in load current and network impedance have an impact on short-circuit fault
currents. The calculation of short-circuit fault current becomes the basis for determining the
working time of the OCR and GFR relays between the recloser and the feeder base PMT. The
relay working time based of the PLN regulation setting protection at 0,1 seconds to eliminate
fault currents and IEC 60255 standard take 0,3 seconds to eliminate fault currents. The results
of the study showed that the time value of PLN's regulation Tms was 0,076 SI and 0,033 SI.
The results of the calculation of (Tms) standard IEC 60255 obtained time (Tms) 0,23 SI and
0,09 SI. The simulation results of the PLN regulation relay settings and IEC 60255 work well
with a grading time value of 0,2 – 0,4 seconds.