ANALISIS SETTING PENGAMAN TRANSFORMATOR DAYA DI GARDU INDUK NUSA DUA JIKA TERJADI GANGGUAN HUBUNG SINGKAT SATU PHASA TANAH
| Main Authors: | Putra Sanjaya, I Gusti Agung, Dyana Arjana, I Gede, Rinas, I Wayan |
|---|---|
| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
Program Studi Teknik Elektro UNUD
, 2017
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| Online Access: |
https://ojs.unud.ac.id/index.php/spektrum/article/view/31509 https://ojs.unud.ac.id/index.php/spektrum/article/view/31509/19464 |
Daftar Isi:
- Relai REF (Restricted Earth Fault) digunakan sebagai peralatan pengaman dari gangguanhubung singkat satu phasa ke tanah, agar arus gangguan tidak mengalir ke titik netral trafo saatputusnya kawat NGR (Neutral Ground Resistor). Arus hubung singkat satu phasa ke tanahsebelum putusnya Pengawatan NGR sebesar 288,67 Ampere, sedangkan arus hubung singkatsesudah putusnya Pengawatan NGR sebesar 884,15 Ampere. Hasil analisis pemasangan relaiREF pada trafo 60 MVA terhadap gangguan hubung singkat satu phasa ke tanah saat putusyapengawatan NGR mempunyai kemampuan proteksi yang baik berdasarkan dari perhitungansimulasi gangguan saat putusnya Pengawatan pentanahan NGR, dengan arus hubung singkatsebesar 884,15 Ampere, maka besar arus yang mengalir pada relai REF sebesar 0,263Ampere, sedangkan relai REF di setting pada 0,233 Ampere, maka dapat di pastikan relai REFsudah bekerja, karena waktu kerja relai REF adalah 0 detik atau tanpa waktu tunda.
- REF (Restricted Earth Fault) Relay is used as protective equipment against single phaseshort circuit to the ground. It prevents the interference current from flowing into the transformerneutral point when the Neutral Ground Resistor (NGR) wire terminates. The single phase shortcircuitcurrent to the ground before the wiring termination was 288.67 NGR Ampere, whereasthe short circuit current after the termination was 884.15 Ampere NGR. An analysis of the REFrelay’s installation on transformer at 60 MVA against short circuit current single phase to groundduring the termination of NGR wiring was conducted. The results showed a reasonably goodprotection capability based on the calculation of the current interruption simulation during theNGR ground wiring termination with the short circuit current of 884.15 Ampere. This findingmeans that the flow of the current on REF relay was at 0.263 Ampere, while the REF relay wasset at 0.233 Ampere. Thus, it can be assured that the REF relay works properly, because theREF relay’s working time is 0 second or without time delay.