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Operation and maintenance practices in the power distribution sector are essential for ensuring reliability, safety, and efficiency of electrical supply. Proper maintenance of substation equipment involves regular inspection, testing, and preventive maintenance. Transformers, circuit breakers, isolators, and protective relays must be periodically checked for overheating, insulation deterioration, oil leakage, and abnormal noise. Transformer oil testing, including dielectric strength and moisture content analysis, helps in maintaining insulation quality. Circuit breakers require periodic ______ _____ ___ ____ _____ ___ _______ ______ _____ _____ ______.
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