ANALISIS UNJUK KERJA RELAI DIFERENSIAL PADA TRANSFORMATOR DAYA DI GARDU INDUK PLN 150 kV KALIBAKAL

WIGUNA, PUTRA ADANG (2019) ANALISIS UNJUK KERJA RELAI DIFERENSIAL PADA TRANSFORMATOR DAYA DI GARDU INDUK PLN 150 kV KALIBAKAL. Bachelor thesis, Universitas Muhammadiyah Purwokerto.

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Abstract

Electrical energy is the one of capital energy in human life which must be continue to exist and constantly supplying energy with minimal disruption. The one of equipment in electrical energy distribution from power plant to consumers is power transformers which is the functions is to increase or decrease the voltage whitout changing the frequncy. The purpose of this study was to determine the reliability of differential relays as protection of power transformers in the PLN 150 kV Kalibakal substation, with comparison methode between the result of mathematical calculation with transformers data spesification in substation. A transformers capacity is 60 MVA and a rating current of 253,034 A on the voltage side of 150 kV and 1905,25 on the side of 20 kV, so the selected ratio is 300/5 on the sides of 150 kV and 2000/5 on the side of 20 kV. The results of the calculation of the error mismatch of 1.125% are still below the standard PLN value of 5%, and the setting flow of the calculation results of 0.48 A is smaller than the standard specification calculation data. . Then in testing the short circuit current with an assumption of 8000 A produces a differential current of 0.76 A which means that it is greater than the current setting and will make a command for circuit breaker trip, while assuming a short circuit interference of 7000 A, the differecintial current obtained is equal to 0.19 A which means that it is smaller than the current setting, the relay will not work and PMT will not trip. From the calculation results that make the differential current to 0.48 A, the result is that the nominal current limit allowed to pass through the current transformer is 8,330.92 A.

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