Koordinasi Sistem Proteksi Pt Polytama Propindo Sehubungan Dengan Pengembangan Pabrik Dan Peningkatan Tegangan Ke 150 KV PLN Dengan Metode Kurva Arus Waktu

Al Fauzi, Emir Hakim (2025) Koordinasi Sistem Proteksi Pt Polytama Propindo Sehubungan Dengan Pengembangan Pabrik Dan Peningkatan Tegangan Ke 150 KV PLN Dengan Metode Kurva Arus Waktu. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

PT Polytama Propindo berencana untuk meningkatkan pasokan tegangan listrik dari PLN menjadi 150 kV untuk memenuhi kebutuhan produksi yang meningkat. Peningkatan tegangan ini berpotensi mengubah nilai arus gangguan hubung singkat sehingga menuntut adanya evaluasi dan penyesuaian ulang pada sistem proteksi kelistrikan yang ada. Kondisi awal sistem proteksi menunjukkan adanya masalah koordinasi, seperti tumpang tindih (overlapping) kurva dan waktu pemutusan (tripping time) yang tidak sesuai standar, yang dapat mengganggu keandalan operasional. Penelitian ini bertujuan untuk mendapatkan setting relai proteksi arus lebih (50/51) yang baru dan menganalisis sistem koordinasi proteksi agar dapat beroperasi secara andal dan selektif pasca-peningkatan tegangan. Metode penelitian meliputi pemodelan dan simulasi sistem kelistrikan menggunakan perangkat lunak ETAP. Analisis diawali dengan studi aliran daya dan hubung singkat untuk menentukan arus beban normal serta arus gangguan maksimum dan minimum. Berdasarkan data tersebut, dilakukan perhitungan ulang parameter proteksi, termasuk arus pickup (Iset), Time Dial Setting (TDS), dan time delay (td). Verifikasi hasil pengaturan ulang dilakukan dengan menganalisis Kurva Arus-Waktu (Time-Current Curve - TCC) pada tiga jalur tipikal yang mewakili sistem. Hasil penelitian menunjukkan bahwa setelah dilakukan pengaturan ulang, sistem proteksi berhasil dikoordinasikan dengan baik. Kurva TCC yang baru tidak lagi tumpang tindih, dan urutan waktu pemutusan antara relai telah memenuhi standar Coordination Time Interval (CTI) 0,2–0,4 detik sesuai rekomendasi IEEE Std 242-2001. Pengaturan ulang ini menghasilkan sistem proteksi yang selektif, sensitif, dan terkoordinasi.
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PT Polytama Propindo plans to increase its electrical power supply from the national utility (PLN) to 150 kV to meet growing production demands. This power upgrade will alter the short-circuit fault current levels, necessitating a thorough evaluation and readjustment of the existing electrical protection system. The initial system exhibited coordination issues, such as overlapping curves and non-standard tripping times, which could compromise operational reliability. This study aims to determine the new settings for the overcurrent protection relays (50/51) and analyze the protection coordination system to ensure it operates reliably and selectively after the power increase. The research methodology involved modeling and simulating the electrical system using ETAP software. The analysis began with load flow and short-circuit studies to determine normal operating currents and the maximum and minimum fault currents. Based on this data, protection parameters, including pickup current (Iset), Time Dial Setting (TDS), and time delay (td), were recalculated. The new settings were verified by analyzing the Time-Current Curves (TCC) for three typical feeder paths representative of the entire system. The results demonstrate that the re-setting successfully coordinated the protection system. The new TCC plots no longer overlap, and the tripping time sequence between main and backup relays now complies with the 0.2–0.4 second Coordination Time Interval (CTI) recommended by IEEE Std 242-2001. This readjustment yields a selective, sensitive, and coordinated protection system capable of effectively isolating faults, thereby ensuring the safety and reliability of the power supply at PT Polytama Propindo.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Koordinasi Proteksi, Relai Arus Lebih, Peningkatan Daya, Hubung Singkat, Kurva Arus-Waktu Protection Coordination, Overcurrent Relay, Power Upgrade, Short Circuit, Time-Current Curve
Subjects:	T Technology > T Technology (General) > T57.62 Simulation
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering
Depositing User:	Emir Hakim Al Fauzi
Date Deposited:	23 Jan 2026 01:08
Last Modified:	23 Jan 2026 01:08
URI:	http://repository.its.ac.id/id/eprint/130128

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