Analisa Sistem Proteksi dengan Metode Perhitungan ARC-Flash yang Dimodifikasi untuk Diaplikasikan pada Sistem Tegangan Menengah di PT. Pupuk Kaltim Unit I (PKT I)
Submission Date: 2012-07-10 11:12:40
Accepted Date: 2012-09-11 00:00:00
Abstract
Berdasarkan standar IEEE 1584-2002 yang mengatur tentang analisa bahaya busur api (arc-flash) pada sistem tegangan rendah dan menengah, pengguna dapat dengan mudah menentukan batas keamanan untuk para pekerja. Namun, perlu diperhatikan bahwa standar yang ada diperoleh dari hasil pengukuran insiden energi busur api pada kondisi tertentu dan dikombinasikan dengan teori. Menurut rekomendasi standar IEEE, perhitungan arus hubung singkat selalu memperhatikan kontribusi arus gangguan dari generator, motor induksi dan sinkron. Besar kecilnya energi arc-flash dapat ditentukan dari beberapa sudut pandang. Diantaranya ialah nilai energi arc-flash akan besar apabila dihitung dengan menggunakan arus bolted three-phase fault, sedangkan dari sudut pandang arc-clearing time yang didapat dari waktu dimana arus gangguan saat itu terjadi akan menghasilkan nilai energi busur api yang lebih rendah. Hal ini memunculkan metode perhitungan modifikasi yang didasarkan pada perhitungan kontribusi arus hubung singkat dan waktu pemadaman busur api (arc-clearing time) sehingga besar energi busur api yang dihasilkan lebih rendah dari perhitungan standar IEEE 1584-2002. Hal tersebut dapat dijadikan sebagai acuan untuk perbaikan sistem pengaman.
Keywords
Arc clearing time, Bolted three-phase fault dan Modifikasi Perhitungan.
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