“STUDI PENERAPAN OVER LOAD SHEDDING (OLS) RELAY PADA SISI SEKUNDER TRANSFORMATOR DAYA 20 MVA PENYULANG ARIES 20 KV DI GARDU INDUK LAHAT”. 2017. Jurnal Ampere 2 (1): 1-11. https://doi.org/10.31851/ampere.v2i1.1205.