Analysis harmonic distortion of side outgoing transformer 20 kv/1.2 kv in traction substation of Tanjung Barat KRL Station

Abstract

Operational Electrical Railway of PT. KAI Commuter Jabodetabek is supplied by overhead contact system 1500 VDC. Traction substation of Tanjung Barat station uses 6 pulse rectifiers to change alternating current (AC) become direct current (DC) with silicon rectifier type. The effect of the rectification process is harmonic current that causes overheating even fire in transformator. This paper aims to resolve the problem on the rectification process by a simulation using an ETAP 12.6.o application by introducing a single tuned passive filter of the 5th order which is customized to the converter circuit load system. The simulation results showed that filter installation caused reduction of average total harmonic distortion (THD) value where 20% load reduced from 20.19% to 1.02%; 40% load reduced from 20.19% to 3.93%, in 60% load reduced from 20.19% to 1.70% and 80% load reduced from 20.20% to 4.91%. It was highlighted that the obtained total harmonic distortion (THD) reduction below 5 % that meet the standards of IEEE 519-1992.