ANALISIS KEANDALAN TRANSFOMATOR 100 MVA DENGAN MENGGUNAKAN SISTEM PENGAMAN REF (Restricted Earth Fault) PADA PT. PLN PERSERO GARDU INDUK SEKAR PUTIH MOJOKERTO JAWA TIMUR
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Institusion
Institut Teknologi Perusahaan Listrik Negara
Author
Pangestu, Witjaksono Adi
Purnama Sari, Dewi
Purnama Sari, Dewi
Subject
Teknik Elektro
Datestamp
2022-09-28 07:37:00
Abstract :
In the transformer there are several disturbances that occur, one of which is a short circuit, which is a condition where the magnitude of the current is very high which can cause damage to electrical equipment connected to the power source. To prevent short-circuit disturbances in the transformer, a safety device, namely restricted earth fault (REF) is needed which has as a back-up protection from the main safety, namely a differential relay. Coordination on transformer safety is to ensure that the work area of each safety is in accordance with the value of the short-circuit current that causes the disturbance. For this reason, it is necessary to analyze and calculate the work area on the back-up protection of restricted earth faults (REF). By using a short circuit fault simulation in the power system analysis application to find the best setting value on the transformer REF relay. Where it is obtained by simulating a short circuit fault at a 70 kV bus voltage, the phase voltage setting is 5.5138 volts with a minimum voltage of 10 volts and the primary operating current in the transformer is 247.0643 A. differential and restricted earth fault (REF) is 30%. With the results of the setting of the REF relay, it is hoped that it can be a reference and increase the reliability of the protection coordination due to the accuracy of the fault work area.
In the transformer there are several disturbances that occur, one of which is a short circuit, which is a condition where the magnitude of the current is very high which can cause damage to electrical equipment connected to the power source. To prevent short-circuit disturbances in the transformer, a safety device, namely restricted earth fault (REF) is needed which has as a back-up protection from the main safety, namely a differential relay. Coordination on transformer safety is to ensure that the work area of each safety is in accordance with the value of the short-circuit current that causes the disturbance. For this reason, it is necessary to analyze and calculate the work area on the back-up protection of restricted earth faults (REF). By using a short circuit fault simulation in the power system analysis application to find the best setting value on the transformer REF relay. Where it is obtained by simulating a short circuit fault at a 70 kV bus voltage, the phase voltage setting is 5.5138 volts with a minimum voltage of 10 volts and the primary operating current in the transformer is 247.0643 A. differential and restricted earth fault (REF) is 30%. With the results of the setting of the REF relay, it is hoped that it can be a reference and increase the reliability of the protection coordination due to the accuracy of the fault work area.
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