Analisis Keandalan Operasi 6 IBT Pada Subsistem Krian Berbasis Kontingensi N-1 Menggunakan Metode Failure Mode And Effects Analysis (FMEA)

Dwiantoro, Bagus (2026) Analisis Keandalan Operasi 6 IBT Pada Subsistem Krian Berbasis Kontingensi N-1 Menggunakan Metode Failure Mode And Effects Analysis (FMEA). Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Meningkatnya kebutuhan pasokan listrik yang andal di Jawa Timur mendorong penguatan subsistem kritis pada sistem kelistrikan Jawa–Madura–Bali (JAMALI). Subsistem Krian memiliki karakteristik unik karena konsentrasi pembebanan tinggi, peran interkoneksi yang strategis, serta operasi paralel beberapa Interbus Transformer (IBT) yang meningkatkan redundansi sistem sekaligus arus hubung singkat. Namun, kondisi eksisting masih menunjukkan pelanggaran kriteria kontingensi N-1, khususnya pada Subsistem Krian–Mojokerto, dengan risiko pelepasan beban (OLS tahap-1) hingga 77,2 MW. Meskipun studi keandalan dan analisis kontingensi telah banyak dilakukan, kajian optimasi operasional pada tingkat subsistem dalam sistem interkoneksi besar, khususnya pada Subsistem Krian, masih sangat terbatas. Dengan penambahan IBT keenam berkapasitas 500 MVA pada tahun 2025, penelitian ini mengevaluasi dua alternatif konfigurasi subsistem menggunakan metode Failure Mode and Effects Analysis (FMEA) yang didukung simulasi aliran daya dan hubung singkat. Hasil menunjukkan bahwa skenario splitting dua subsistem menghasilkan Risk Priority Number (RPN) lebih rendah dan memenuhi kriteria N-1, meskipun arus hubung singkat meningkat dari 23,77 kA menjadi 28,33 kA dan masih berada dalam kemampuan pemutusan CB/PMT (56,66% terhadap breaking capacity). Sebaliknya, skenario splitting tiga subsistem menurunkan keandalan dan menimbulkan risiko padam sebesar 275 MW akibat OLS tahap-3 meskipun mampu menurunkan arus hubung singkat menjadi 18,08 kA. Penelitian ini berkontribusi menawarkan kerangka evaluasi berbasis risiko melalui integrasi analisis kontingensi dan FMEA untuk rekonfigurasi subsistem, serta merekomendasikan operasi splitting dua subsistem sebagai strategi operasi Subsistem Krian yang baru.
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The increasing demand for reliable electricity supply in East Java necessitates reinforcement of critical subsystems within the Java–Madura–Bali (JAMALI) power system. The Krian Subsystem presents a unique case due to its high loading concentration, strategic interconnection role, and the parallel operation of multiple Interbus Transformers (IBTs), which simultaneously enhance system redundancy and increase short-circuit current levels. However, the existing operating condition still exhibits violations of the N-1 contingency criterion, particularly in the Krian–Mojokerto Subsystem, with a potential load shedding risk of up to 77.2 MW due to Stage-1 Overload Shedding (OLS). Although reliability and contingency studies have been widely conducted, subsystem-level operational optimization in large interconnected networks, particularly for the Krian Subsystem, remains limited. Following the installation of a sixth 500 MVA IBT in 2025, this study evaluates two alternative subsystem configurations using Failure Mode and Effects Analysis (FMEA) supported by power flow and short-circuit simulations. The results indicate that the two-subsystem splitting scenario produces a lower Risk Priority Number (RPN) and satisfies the N-1 criterion, although short-circuit current increases from 23.77 kA to 28.33 kA and remains within circuit breaker interrupting capability (56.66% of the breaking capacity). In contrast, the three-subsystem splitting scenario reduces system reliability and introduces a 275 MW outage risk due to Stage-3 OLS despite lowering the short-circuit current to 18.08 kA. This study contributes a risk-based evaluation framework through the integration of contingency analysis and FMEA for subsystem reconfiguration and recommends the two-subsystem splitting operation as the preferred operating strategy for the new Krian Subsystem.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Keandalan Subsistem, Analisis Kontingensi N-1, Aliran Daya, Optimalisasi Konfigurasi, FMEA Subsystem Reliability, N-1 Contingency Analysis, Load Flow, Configuration Optimization, FMEA
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1007 Electric power systems control
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20101-(S2) Master Thesis
Depositing User:	Bagus Dwiantoro
Date Deposited:	29 Jul 2026 01:26
Last Modified:	29 Jul 2026 01:26
URI:	http://repository.its.ac.id/id/eprint/138740

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