scholarly journals ANALISIS SISTEM PROTEKSI OVERCURRENT RELAY PEMBANGKIT LISTRIK TENAGA UAP PT. MAKASSAR TENE

2019 ◽  
Vol 16 (2) ◽  
pp. 88
Author(s):  
A. Anugrah Shafar ◽  
Sharma Thaha ◽  
Ahmad Gaffar
Keyword(s):  

Analisis sistem proteksi overcuurent relay merupakan penelitian yang dilakukan untuk mengetahui besar nilai arus hubung singkat 3 phasa yang terjadi di setiap bus atau titik. Dengan mengetahui nilai arus hubung singkat 3 phasa, penulis dapat menentukan setting yang tepat pada overcurrent relay dalam menangani gangguan hubung singkat yang terjadi serta alur koordinasi yang dilakukan oleh setiap relay. Dalam penelitian yang dilakukan di PT. Makassar Tene ini, titik yang diteliti sebagai gangguan yaitu berada pada bus 1, bus 3 dan bus 7. Perhitungan hubung singkat 3 phasa dilakukan dengan metode perhitungan manual dengan menggunakan matriks impedansi dan simulasi menggunakan Digsilent Powerfactory 15.1.  Hasil perhitungan manual diperoleh arus pada bus 1 sebesar 2,06 kA, bus 3 sebesar 4,6 kA dan bus 7 sebesar 10,5 kA.  Hasil simulasi Digsilent Powerfactory 15.1 diperoleh arus pada bus 1 sebesar 2,3 kA, bus 3 sebesar 4,9 kA dan bus 7 sebesar 9,6 kA. Berdarkan hasil besaran arus hubung singkat, maka setting pada OCR1 sebesar 53 A, OCR2 sebesar 30,82 A, OCR3 sebesar 809,24 A, OCR6 sebesar 44,04 A dan OCR7 sebesar  924,85 A.  

Electricity ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 524-553
Author(s):  
Haneen Bawayan ◽  
Mohamed Younis

The inclusion of distributed energy resources (DER) in Microgrids (MGs) comes at the expense of increased changes in current direction and magnitude. In the autonomous mode of MG operation, the penetration of synchronous distributed generators (DGs) induces lower short circuit current than when the MG operates in the grid-connected mode. Such behavior impacts the overcurrent relays and makes the protection coordination difficult. This paper introduces a novel adaptive protection system that includes two phases to handle the influence of fault current variations and enable the MG to sustain its operation. The first phase optimizes the power flow by minimizing the generators’ active power loss while considering tolerable disturbances. For intolerable cases, the second phase opts to contain the effect of disturbance within a specific area, whose boundary is determined through correlation between primary/backup relay pairs. A directional overcurrent relay (DOCR) coordination optimization is formulated as a nonlinear program for minimizing the operating time of the relays within the contained area. Validation is carried out through the simulation of the IEEE 9, IEEE 14, and IEEE 15 bus systems as an autonomous MG. The simulation results demonstrate the effectiveness of our proposed protection system and its superiority to a competing approach in the literature.


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