Analisa Perbaikan Kabel Power 20 kV Breakdown Pada Unit Trafo Satu Gardu Induk Depok
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Institusion
Institut Teknologi Perusahaan Listrik Negara
Author
Sitorus, Doni Cristoper
Hutadjulu, Albert Gifson
Hutadjulu, Albert Gifson
Subject
Teknik Elektro
Datestamp
2022-09-30 03:13:42
Abstract :
Based on the incident on March 12, 2021, there was a trip interruption of 150 kV PMT and 20 kV transformer 1 at the Depok Substation. In this disturbance, the protection system that works is the R-phase differential relay and the LV REF relay. The impact of this disturbance is the loss of the load of 1732 A. The cause of the disturbance is the breakdown of the 20 kV ground cable, this results in a short circuit to the ground so that the differential protection relay and the LV REF work because the relay feels a disturbance in its safety area. The results of this study found that the breakdown cable is in the cable support rack where the cable support rack is sharp so that it injures the insulation of the cable. From the calculation of the leakage current using the thermal failure method, the same results are obtained for the three phases, namely the R core 1, R core 3, and S core 1 phases of 0.97 A. The results of these calculations are very far from the standard values that have been determined because it is necessary to monitor the leakage current in the power cable.
Based on the incident on March 12, 2021, there was a trip interruption of 150 kV PMT and 20 kV transformer 1 at the Depok Substation. In this disturbance, the protection system that works is the R-phase differential relay and the LV REF relay. The impact of this disturbance is the loss of the load of 1732 A. The cause of the disturbance is the breakdown of the 20 kV ground cable, this results in a short circuit to the ground so that the differential protection relay and the LV REF work because the relay feels a disturbance in its safety area. The results of this study found that the breakdown cable is in the cable support rack where the cable support rack is sharp so that it injures the insulation of the cable. From the calculation of the leakage current using the thermal failure method, the same results are obtained for the three phases, namely the R core 1, R core 3, and S core 1 phases of 0.97 A. The results of these calculations are very far from the standard values that have been determined because it is necessary to monitor the leakage current in the power cable.
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