KOORDINASI RELAY ARUS LEBIH (OCR) DAN RELAY DIFERENSIAL PADA TRANSFORMATOR DAYA KAPASITAS 60 MVA GARDU INDUK CIPINANG 150/20 KV
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Institusion
Institut Teknologi Perusahaan Listrik Negara
Author
Nursal, Eviyana
Dini, Hasna Satya
Dini, Hasna Satya
Subject
Teknik Elektro
Datestamp
2022-11-07 06:56:18
Abstract :
The Cipinang Substation has a power transformer with a capacity of 60 MVA which consists of several protection systems, namely 1 differential relay and 2 overcurrent relays (OCR). In ensuring the reliability of power supply to customers, a protection that is able to work optimally is needed so that the electricity supply reaches consumers without any obstacles or disturbances. So that things like this can be prevented or minimized, it is necessary to set relay protection and coordination settings between differential relays and overcurrent relays that are good and correct in order to be able to protect transformers from short-circuit and overcurrent disturbances. The results of the analysis carried out illustrate that the differential relay works as the main protection in the event of a disturbance in the transformer protection area and for the overcurrent relay it can be the main protection in the event of a disturbance outside the transformer protection area. After doing the calculations, the OCR primary setting current for the 150 kV side is 277.2 A and the 20 kV side is 2078.4 A with the TMS value for the 150 kV side is 0.075 A and the TMS value for the 20 kV side is 0.175 A, while the differential relay setting value is 0.16 A. and after a 3-phase short circuit simulation using the ETAP application, the relay coordination runs optimally.
The Cipinang Substation has a power transformer with a capacity of 60 MVA which consists of several protection systems, namely 1 differential relay and 2 overcurrent relays (OCR). In ensuring the reliability of power supply to customers, a protection that is able to work optimally is needed so that the electricity supply reaches consumers without any obstacles or disturbances. So that things like this can be prevented or minimized, it is necessary to set relay protection and coordination settings between differential relays and overcurrent relays that are good and correct in order to be able to protect transformers from short-circuit and overcurrent disturbances. The results of the analysis carried out illustrate that the differential relay works as the main protection in the event of a disturbance in the transformer protection area and for the overcurrent relay it can be the main protection in the event of a disturbance outside the transformer protection area. After doing the calculations, the OCR primary setting current for the 150 kV side is 277.2 A and the 20 kV side is 2078.4 A with the TMS value for the 150 kV side is 0.075 A and the TMS value for the 20 kV side is 0.175 A, while the differential relay setting value is 0.16 A. and after a 3-phase short circuit simulation using the ETAP application, the relay coordination runs optimally.
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