<![CDATA[Substations are an essential part of the electric power system, functioning to maintain the continuity of electrical energy distribution so that it remains stable, safe, and reliable. One of the main pieces of equipment in a substation is the Circuit Breaker (CB), also known as a Power Circuit Breaker (PMT), which functions to interrupt and connect electrical current under both normal operating conditions and fault conditions. Failures in Circuit Breakers can disrupt the protection system and reduce the reliability of the power system. Therefore, preventive maintenance activities are necessary to ensure that the equipment continues to operate optimally. This research aims to analyze the effect of preventive maintenance of substation equipment on reducing electrical disturbances and improving the reliability of the power system. The research method used is a literature review by collecting data from scientific journals, books, and maintenance reports on Circuit Breakers at the Cilegon Baru Bay PLTGU 1 150 kV Substation. The results show that routine preventive maintenance can improve equipment condition, enhance insulation performance, maintain mechanical and electrical systems, and reduce the potential for electrical disturbances. Inspections of SF6 gas pressure, grounding systems, the opening and closing mechanisms of the PMT, and the cleanliness of components are important factors in maintaining Circuit Breaker performance. Therefore, preventive maintenance plays an important role in improving the reliability of the electric power system and maintaining the continuity of electrical energy distribution to consumers.]]>
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