Genda, Yuniar Machmud Genda (2026) Analisis Pengaruh Implementasi DGR Dan Voltage - Restrained Overcurrent Relay Terhadap Parameter Keandalan Sistem Distribusi 20 KV, Studi Kasus PLN ULP Sutojayan. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sistem distribusi 20 kV dengan konfigurasi high resistance grounding memiliki karakteristik arus gangguan satu fasa ke tanah yang relatif kecil, sehingga proteksi konvensional berbasis OCR dan GFR non-directional berpotensi mengalami keterbatasan sensitivitas dan selektivitas. Penelitian ini menganalisis pengaruh implementasi Potential Transformer (PT) sebagai pendukung Directional Ground Relay (DGR) dan Voltage-Restrained Overcurrent Relay (VROC) terhadap peningkatan keandalan sistem distribusi 20 kV pada Penyulang Wonotirto PLN ULP Sutojayan. Metode penelitian dilakukan melalui analisis data lapangan sebelum dan sesudah implementasi, simulasi proteksi menggunakan MATLAB/Simulink, evaluasi indeks keandalan menggunakan ETAP, serta analisis risiko menggunakan Failure Mode and Effect Analysis (FMEA). Hasil penelitian menunjukkan bahwa jumlah disturbance event recloser menurun dari 68 kejadian menjadi 17 kejadian setelah implementasi PT-assisted DGR dan VROC. Berdasarkan Tabel 4.5, nilai SAIDI menurun dari 0,3880 menjadi 0,3399 hr/customer.year, sedangkan SAIFI menurun dari 2,2222 menjadi 0,6190 interruption/customer.year. Indeks EENS dan ECOST juga mengalami penurunan, yang menunjukkan berkurangnya energi tidak tersalurkan dan biaya interupsi akibat gangguan. Hasil simulasi menunjukkan bahwa penambahan referensi tegangan residu melalui PT meningkatkan kemampuan relay dalam membedakan gangguan sisi hulu dan hilir recloser. Dengan demikian, implementasi PT-assisted DGR dan VROC terbukti meningkatkan selektivitas, security, dan keandalan sistem distribusi 20 kV.
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A 20 kV distribution system with a high-resistance grounding configuration is characterized by relatively low single line-to-ground fault currents, causing conventional protection schemes based on non-directional Overcurrent Relays (OCR) and Ground Fault Relays (GFR) to experience limitations in sensitivity and selectivity. This study analyzes the effect of implementing a Potential Transformer (PT) to support the performance of Directional Ground Relays (DGR) and Voltage-Restrained Overcurrent Relays (VROC) in improving the reliability of the 20 kV distribution system on the Wonotirto feeder at PLN ULP Sutojayan. The research methodology was conducted through field data analysis before and after implementation, protection system simulations using MATLAB/Simulink, reliability index evaluation using ETAP, and risk analysis using Failure Mode and Effect Analysis (FMEA). The results show that the number of recloser disturbance events decreased from 68 events to 17 events after the implementation of PT-assisted DGR and VROC. Based on Table 4.5, the SAIDI value decreased from 0,3880 to 0,3399 hr/customer.year, while the SAIFI value decreased from 2,2222 to 0,6190 interruptions/customer.year. The EENS and ECOST indices also decreased, indicating a reduction in unserved energy and interruption costs caused by system disturbances. The simulation results demonstrate that the addition of residual voltage references through the PT improves the relay’s capability to distinguish between upstream and downstream faults relative to the recloser location. Therefore, the implementation of PT-assisted DGR and VROC has been proven to enhance the selectivity, security, and reliability of the 20 kV distribution system.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Directional ground relay, Keandalan Sistem Distribusi, High-resistance grounding, Potential Transformer, Voltage-restrained overcurrent relay, Directional ground relay, Distribution system reliability, High-resistance grounding, Potential Transformer, Voltage-restrained overcurrent relay |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3030 Electric power distribution systems |
| Divisions: | Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20101-(S2) Master Thesis |
| Depositing User: | Yuniar Machmud Genda |
| Date Deposited: | 31 Jul 2026 07:38 |
| Last Modified: | 31 Jul 2026 07:38 |
| URI: | http://repository.its.ac.id/id/eprint/139565 |
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