Perform scheduled preventive maintenance on air, oil, vacuum, SF6 Power circuit breakers and SF6 gas insulated circuit switchers and their associated operating mechanisms and control systems.
Insulation Power Factor
Contact Time-travel Analysis
Contact Resistance Test
Bushing Current Transformer Tests (Ratio, Polarity And Saturation)
Filter Insulating Oil As Required
Perform Oil Dielectric Test
Oil Color (before and after filtering)
Inspect Operating Mechanism-Adjust, Lubricate and Clean As Required
Check Control Wire
Check Auxiliary AC and Heaters
Check Trip and Close Coil Resistance's
Perform Pressure System Checks As Recommended by Manufacturer
Perform Primary Current Injection Tests and Calibrate Protective Devices
Perform Secondary Current Injection Tests
Perform Insulation Resistance and Over potential Tests
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