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ANALISIS SETTING DAN KINERJA RELAI DIFFERENSIAL PADA TRANSFORMATOR 4 GARDU INDUK UJUNGBERUNG BERDASARKAN KARAKTERISTIK SLOPE
Keandalan sistem proteksi transformator sangat penting untuk menjaga kontinuitas pasokan listrik dan mencegah kerusakan peralatan akibat gangguan. Relai differensial merupakan proteksi utama transformator yang berfungsi untuk mendeteksi gangguan internal dengan membandingkan arus masuk dan arus keluar. Transformator 4 Gardu Induk Ujungberung pernah mengalami gangguan, kegagalan, kebakaran, maloperasi, dan setting relai yang terlalu besar sehingga kurang sensitif pada terhadap arus gangguan. Analisis setting dan kinerja relai diferensial berdasarkan karakteristik slope diperlukan untuk meningkatkan keandalan sistem proteksi. Penelitian ini bertujuan untuk membandingkan perhitungan setting teoritis dengan setting terpasang relai diferensial serta menganalisis kinerjanya melalui simulasi arus gangguan dan karakteristik slope. Metode yang digunakan meliputi perhitungan teoritis dan simulasi menggunakan ETAP 19.0.1 dan Microsoft Excel untuk memodelkan gangguan internal dan eksternal. Hasil penelitian menunjukkan gap signifikan antara perhitungan setting teoritis (slope 1 = 11,762%, slope 2 = 23,524%) dan setting terpasang (slope 1 = 30%, slope 2 = 80%). Evaluasi berdasarkan standar minimum dengan setting slope 1 = 25% dan slope 2 = 50% menghasilkan kinerja relai yang lebih seimbang, sensitif terhadap gangguan internal dan stabil terhadap gangguan eksternal. Rekomendasi untuk menggunakan jenis relai low impedance differential relay dan evaluasi setting relai differensial dengan pertimbangan inrush current saat transformator energize, arus eksitasi, stability, dam harmonic restraint. The reliability of transformer protection systems is very important to maintain continuity of electricity supply and prevent equipment damage due to disturbances. Differential relays are the main protection for transformers, functioning to detect internal disturbances by comparing the incoming and outgoing currents. The 4 Ujungberung Substation transformers have experienced disturbances, failures, fires, malfunctions, and relay settings that were too large, making them less sensitive to disturbance currents. An analysis of the differential relay settings and performance based on slope characteristics is necessary to improve the reliability of the protection system. This study aims to compare the theoretical setting calculations with the installed differential relay settings and analyze their performance through fault current simulation and slope characteristics. The methods used include theoretical calculations and simulations using ETAP 19.0.1 and Microsoft Excel to model internal and external faults. The results of the study indicate a significant gap between the theoretical setting calculations (slope 1 = 11.762%, slope 2 = 23.524%) and the installed settings (slope 1 = 30%, slope 2 = 80%). Evaluation based on minimum standards with slope settings of 1 = 25% and slope 2 = 50% resulted in more balanced relay performance, sensitivity to internal disturbances, and stability against external disturbances. Recommendations include using a low-impedance differential relay and evaluating differential relay settings with consideration of inrush current when the transformer energizes, excitation current, stability, and harmonic restraint.
KODEPRODI20201#Teknik Elektro_S1, Universitas Pendidikan Indonesia
ANALISIS SETTING DAN KINERJA RELAI DIFFERENSIAL PADA TRANSFORMATOR 4 GARDU INDUK UJUNGBERUNG BERDASARKAN KARAKTERISTIK SLOPE (Text)
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