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Oktavianus Kati
Universitas Cenderawasih
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering

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Analysis of the Implementation of the Orya Hydroelectric Power Plant's Island Defense Scheme in the Jayapura Power System Wardiman; Yosef Lefaan; Oktavianus Kati; Joni
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.9477

Abstract

This study aims to determine whether the islanding-based defense scheme at the Orya hydropower plant can effectively maintain the stability of the Jayapura radial power system during major disturbances. The system was modeled and tested in DIgSILENT PowerFactory under several outage scenarios, with a focus on the separation of the Orya–Sentani–Skyline corridor. The simulation indicates that maintaining post-disturbance operation within the nominal frequency of around 50 Hz and voltage variation of ±5% requires shedding 19.89 MW of load from selected feeders. After the scheme is activated, the islanded Orya subsystem settles at approximately 50.15 Hz, while the remaining grid stabilizes near 50.0 Hz—both within regulatory limits. These findings suggest that a combined load-shedding and islanding strategy can reduce the risk of cascading failures in Jayapura and may offer a practical template for other radial systems with limited redundancy.
Analysis of Voltage Drop and Power Loss Calculations inthe Edelweiss Feeder of PT PLN (Persero) Abepura Customer Service Unit Ekawati Margaretha Ohee; Dultudes Mangopo; Suparno; Oktavianus Kati; Rombe Allo; Semuel Boron Membala; Allo Sarira Pongsapan
Jurnal ASIIMETRIK Jurnal Ilmiah Rekayasa & Inovasi Volume 8 Number 2 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i2.9965

Abstract

This study evaluates the performance of the 20 kV Edelweiss feeder by analysing transformer loading, voltage drop, and technical power losses in a radial distribution network. The analysis is based on a bus-by-bus electrical model derived from feeder topology, conductor impedance, load current, power factor, and segment length data. Voltage profiles and technical losses are quantified using established three-phase power flow relationships based on Ohm’s law and Kirchhoff’s current law, enabling the assessment of cumulative voltage drop and loss propagation along the feeder. The results show that the feeder maintains a highly stable voltage profile, with a total voltage drop of 41.422 V, equivalent to approximately 0.207% of the nominal 20 kV voltage. Total active and reactive power losses are 7.3103 kW and 4.7821 kVAR, respectively, with more than 96% of these losses concentrated in Bus 2 and Bus 3. The findings demonstrate that technical losses are governed primarily by current accumulation, electrical distance, and topological position within the radial network rather than by conductor length alone. This study contributes a feeder-level understanding of how upstream current aggregation shapes voltage-drop and loss distribution, providing empirical evidence for identifying critical segments in medium-voltage radial distribution systems .
Co-Authors Allo Sarira Pongsapan Dultudes Mangopo Ekawati Margaretha Ohee Joni Rombe Allo Semuel Boron Membala Suparno Wardiman Yosef Lefaan