EVALUASI SISTEM PROTEKSI TRANSFORMATOR DAYA 60 MVA GARDU INDUK PAUH LIMO TRAGI PADANG

Abstract

The adjustment relay overcurrent, relay circuit ground, and relays the differential poorly can cause blackout, one of the efforts is to evaluate the setting of relay protection of power transformers of 60 MVA substation Pauh Limo so mutually coordinated and protection work in accordance with the function and the value of the relay settings without disturbing other work. With working time relay OCR side incoming obtained 0,2 seconds, 0.26 seconds incoming GFR, and the working time relay OCR side 150 kV 0.28 seconds, 0.66 seconds GFR of 150 kV, while the differential relay, which works when the noise current A and I_set 163.88 57.84 A. setting this relay can be used as a reference in the evaluation and re-setting power transformer protection system.  
Keywords: Power transformers, OCR, GFR and differential relay