STUDI KOORDINASI OCR DAN GFR SALURAN DISTRIBUSI PENYULANG SANDA UNTUK MENINGKATKAN KONTINUITAS PELAYANAN

Abstract

The Sanda feeder is supplied by Antosari Substation through transformer unit II and it
has 3 reclosers, they are pempatan recloser,bangsing recloser and palisan recloser. Based on
the 2017 disturbance fault recapitulation data from PT PLN (Persero) Bali, it has been phasephase
and 1-phase ground short circuit in Sanda feeders almost every month. One of the
problems that often occurs in Sanda Feeders is when a phase-phase and 1-phase ground fault
occurs at the end of the feeder network and causes simultaneous trips to the recloser at the
base of feeder network, causing the Sanda feeder relay to blackout. This shows the system
need to analyze the evaluation of the coordination settings for the OCR and GFR protection
system on the recloser and Sanda Feeder relays to minimize disturbances so as to improve
service continuity. The analysis and simuation results represent that, the existing setting
conditions of OCR and GFR has coincide coordination curves and the grading time is still below
0.3 seconds. The calculation and simulation of OCR and GFR that are carried out show that the
protection system works selectively in the absence of coincide coordinating curves and a time
grading value above 0.3 seconds according to the IEC 60255 standard.