Kinerja Relai Diferensial Diukur melalui Pemberian Simulasi Fenomena Gangguan Internal pada Transformator Daya

Arief Goeritno, Syofyan Rasiman, Irwan Nugraha, Ayumi Johan

Abstract


Pengukuran kinerja relai diferensial disimulasikan dengan dua kondisi, yaitu pemberian fenomena gangguan di luar dan di dalam daerah perlindungan transformator daya. Hasil pengukuran terhadap arus yang teralirkan ke relai diferensial saat pemberian kondisi gangguan di luar daerah perlindungan, diperoleh arus pada fase-R 1,9 mA, fase-S 1,7 mA, dan fase-T sebesar 2,2 mA, sedangkan nilai arus ke relai diferensial seharusnya sebesar nol mA, sehingga terdapat selisih hasil pengukuran sebesar 3,020668% untuk fase-R, 2,782324% untuk fase-S, dan 3,618421% untuk fase-T. Hasil perhitungan terhadap arus yang teralirkan ke relai diferensial dari masing-masing fase sebesar 1,57 mA, sedangkan nilai arus seharusnya sebesar nol mA, sehingga masing-masing fase terdapat selisih sebesar 2,078919%. Hasil pengukuran saat pemberian kondisi berbeban, diperoleh arus yang teralirkan ke relai pada fase-R 2,6 mA, fase-S 2,8 mA, dan fase-T sebesar 3,5 mA, tetapi relai diferensial tidak beroperasi, karena relai disetel dengan nilai sebesar 130% dari arus terbesar di antara ketiga fase, sehingga diperoleh arus penyetelan (Iset.) = 3,5 + (30% x 3,5) = 4,45 mA. Hasil pengukuran terhadap arus yang teralirkan ke relai diferensial saat pemberian fenomena gangguan di dalam daerah perlindungan, diperoleh arus yang teralirkan ke relai pada fase-R 127,7 mA, fase-S 123,9 mA, dan fase-T sebesar 123,8 mA, sedangkan hasil perhitungan terhadap arus yang teralirkan ke relai diferensial dari masing-masing fase sebesar 152,61 mA.

Keywords


relai diferensial, simulasi fenomena gangguan internal, transformator daya di gardu induk

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References


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