Reposisi Current Transformator Restricted Earth Fault Pada Neutral Grounding Resistor
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Institusion
Institut Teknologi Perusahaan Listrik Negara
Author
Ananda, Rizky
Pasra, Nurmiati
Hajar, Ibnu
Pasra, Nurmiati
Hajar, Ibnu
Subject
Teknik Elektro
Datestamp
2022-10-04 03:13:45
Abstract :
Repositioning based on the word IE Re: redo/change and position: location means changing or rerepeating the location of the CT REF previously laid before NGR and now converted into after NGR, this aims to avoid happening again the trip that occurs on the transformer 60 MVA 150/20 KV caused flashover on the device substations. The largest short-circuited disruption at 3 phases amounted to 12830 Ampere, in the largest 2 phase disruption of 11049.7 Ampere, and the largest disruption at 1 phase to the ground by 288.67 Ampere. The result of short-circuited analysis is 288.67 A on. And the result of the analysis of relay settings obtained from the calculation of one phase of the ground is 0.125 A. And based on the results obtained Restricted Earth Fault (REF) that is installed is still in good condition and can withstand the flow of interference, and also do not need to perform a reset. Flashover is caused by several factors namely NgR House that open so that animals enter into NGR and NGR maintenance should be considered not much dust, animal dirt, rainwater, etc.
Repositioning based on the word IE Re: redo/change and position: location means changing or rerepeating the location of the CT REF previously laid before NGR and now converted into after NGR, this aims to avoid happening again the trip that occurs on the transformer 60 MVA 150/20 KV caused flashover on the device substations. The largest short-circuited disruption at 3 phases amounted to 12830 Ampere, in the largest 2 phase disruption of 11049.7 Ampere, and the largest disruption at 1 phase to the ground by 288.67 Ampere. The result of short-circuited analysis is 288.67 A on. And the result of the analysis of relay settings obtained from the calculation of one phase of the ground is 0.125 A. And based on the results obtained Restricted Earth Fault (REF) that is installed is still in good condition and can withstand the flow of interference, and also do not need to perform a reset. Flashover is caused by several factors namely NgR House that open so that animals enter into NGR and NGR maintenance should be considered not much dust, animal dirt, rainwater, etc.
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