Analisis Proteksi Arus Lebih (OCR) pada Penyulang Nginden 20KV PT. PLN UP3 Surabaya Selatan

Al Bukhori, Ilham Daffa Firdaus (2025) Analisis Proteksi Arus Lebih (OCR) pada Penyulang Nginden 20KV PT. PLN UP3 Surabaya Selatan. Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Abstract

Sistem distribusi tenaga listrik rentan terhadap gangguan hubung singkat yang dapat menyebabkan kerusakan peralatan dan gangguan kontinuitas pelayanan. Penelitian ini bertujuan menganalisis kinerja sistem proteksi arus lebih (Overcurrent Relay/OCR) pada Penyulang Nginden 20 kV di PT. PLN UP3 Surabaya Selatan. Hasil menunjukkan bahwa arus gangguan menurun seiring bertambahnya jarak gangguan dari gardu. Arus tertinggi terjadi pada gangguan tiga fasa sebesar 17.021,27 A pada 10% penyulang hingga 5.137,42 A pada 100% penyulang, diikuti dua fasa sebesar 8.510,63 A hingga 2.568,71 A dan satu fasa ke tanah sebesar 5.655,67 A hingga 1.517,61 A. Setting OCR ditentukan berdasarkan arus beban 480 A dengan rasio CT 1000/5 dan faktor keamanan 1,2 menghasilkan arus setting 576 A dan TMS 0,150 detik. Waktu kerja relay bervariasi menunjukkan bahwa gangguan 3 fasa memiliki waktu deteksi tercepat antara 0,299–0,469 detik, diikuti gangguan 2 fasa 0,379-0,691 detik, dan gangguan 1 fasa ke tanah terlama 0,449-1,073 detik sesuai jenis dan lokasi gangguan. Setting ini memenuhi prinsip keandalan, selektifitas,sensitivitas, dan kecepatan, serta relevan untuk optimalisasi sistem proteksi distribusi 20 kV.

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