FEASIBILITY ANALYSIS OF CIRCUIT BREAKER (PMT) ON BAY LINE AN BAY TRANSFORMER AT KOTA BARU SUBSTATION

Abstrak

Electric transmission lines play a crucial role in delivering stable and efficient power to consumers. A key component in transmission systems is the Circuit Breaker (PMT), which protects major equipment from faults like overcurrent or short circuits. This study evaluates the operational feasibility of PMTs at Bay Line and Bay Trafo in Kota Baru Substation. Evaluation is based on insulation resistance, contact resistance, and contact simultaneity tests, using maintenance data from ULTG Pontianak. Results show insulation resistance above the 150 MΩ standard, averaging 165 MΩ (Bay Line) and 170 MΩ (Bay Trafo), indicating good insulation. Contact resistance meets IEC 60694 standards (≤50 μΩ), with a maximum of 42 μΩ recorded. Contact simultaneity, analyzed with a Megger Egil Circuit Breaker Analyzer, shows a maximum phase time difference of 8 ms, within the SPLN 52-1 1984 limit (≤10 ms). Findings confirm that PMTs remain operational and effectively protect the system. However, regular maintenance is essential, especially as the equipment exceeds 10 years of use. This study contributes to power reliability and future data-driven maintenance protocols.