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Comprehensive Electrical System Maintenance Checklists

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Comprehensive Electrical System Maintenance lecture
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    5044 B U Bowman Dr #102 ::: Buford, Georgia 30518   e-mail stedipower@tvss.net ::: Phone: 678.546.6780   Comprehensive Electrical System Maintenance Checklists   GENERAL ANNUAL CHECKS  (1) Review past maintenance records to find repair patterns. These records may point to certain components that should be closely inspected during performance of  preventive maintenance. (2) Review operator records concerning electrical load readings; compare with equipment ratings. Operator records regarding operating temperatures and any documented abnormal circumstances associated with the system should also be reviewed. (3) Inspect Secondary Electrical Distribution Equipment: (a) Inspect to ensure that warning signs exist. Replace as required. (b) Inspect enclosures for damage, unauthorized openings, and corrosion of metallic objects. Repair and  paint as required. (c) Inspect air passages and remove any blockage. (d) Inspect, investigate, and solve conditions for unusual odors. (e) As equipment is operated and tested, listen, investigate, and solve conditions for unusual noises. (f) Inspect electrical connections for degradation and tightness. Repair as required. (g) Inspect electrical insulation for discoloration and degradation. Repair as required. (h) Inspect equipment grounding components such as conductors and connections. Repair as required. (i) Inspect insulators for damage. Replace as required. (j) Inspect liquid immersed equipment for leaks and damage. (k) Inspect indicating lights for correct illumination.  (4) Remove debris, dirt, and other foreign objects from all components, housings, cabinets, panels, etc. (5) Torque all electrical connections to design value.. (6) Verify operation of space heaters and control thermostat. Check thermostat set  point for proper setting. (7) Verify the grounding of the equipment and associated neutral where applicable. (8) Conduct infrared test on all main current carrying equipment for hot spots that may indicate overload conditions or loose connections. (9) Using calibrated test instruments, calibrate ammeters, voltmeters, etc. Verify continuity of metering selector switch contacts with ohmmeter.    COMPREHENSIVE ELECTRICAL SYSTEM CHECKLIST   Secondary Distribution System   Annual  Inspect to ensure that warning signs exist. Replace as required. Inspect enclosures for damage, unauthorized openings, and corrosion of metallic objects. Inspect air passages and remove any blockage. Inspect, investigate, and solve conditions for unusual odors. As equipment is operated and tested, listen, investigate, and solve conditions for unusual noises. Inspect electrical connections for degradation and tightness. Inspect electrical insulation for discoloration and degradation. Inspect equipment grounding components such as conductors and connections. Inspect insulators for damage. Inspect liquid immersed equipment for leaks and damage. Inspect indicating lights for correct illumination. Clean equipment. Tighten electrical connections.. Verify space heater operation Verify equipment grounding. Perform infrared test. Calibrate recording and indicating metering. Low Voltage Switchgear, Switchboards, and Panelboards   Six Month:  Inspect solid electrical insulation for discoloration and degradation. Annual:      Review operator records. Inspect barriers and shutters for physical damage. Test phase bus insulation Service circuit breakers. Inspect drawout contacts for abnormal wear, tension, and discoloration. Correct as required. Inspect breakers’ current carrying components for discoloration that may indicate overheating. Replace as required. Inspect, operate, adjust, and lubricate mechanical linkages. Replace components as required. Verify interlocks preventing a closed switchgear drawout breaker from being withdrawn from or connected to the switchgear bus. Inspect and dress current carrying contacts on air circuit breakers in accordance with manufacturer’s recommendations.  Test power circuit breakers. Perform test operations to prove correct actuation of  breakers’ trip and close components, including spring charging motors, trip solenoids, indicating targets, etc. Perform contact resistance test. Perform insulation resistance test on each phase-to-phase and phase-to-ground using a megohmmeter. Prove circuit breaker operation by actuation of each associated protective device. Prove circuit breaker operation by actuation of each breaker’s manual control switch or handle. Test molded-case circuit breakers. Perform overcurrent test on critical load  breakers to prove corr  ect actuation of breaker’s trip and close components.  Perform contact resistance test on critical load breakers. Prove circuit breaker operation by actuation of each breaker manual control switch or handle. Verify equipment alarms. Protective device calibration . Perform harmonics analysis Measure and record neutral currents.  Transformers   Annual:  Inspect forced cooling system equipment for damage, etc Operate system by simulating high temperature at controlling devices. Verify transformer alarms. Motor Control Center   Annual:  Inspect main contacts and auxiliary contacts on contactors. Inspect pushbuttons, indicating lights, selector switches, etc. Inspect indicating lamps for burned out bulbs or improper illumination. Test phase bus insulation Inspect drawout contacts for abnormal wear, tension, and discoloration. Correct as required. Inspect units’ current carrying components for discoloration that may indicate overheating. Inspect, operate, adjust, and lubricate mechanical linkages. Verify mechanical interlocks. yr Inspect and dress current carrying contacts on switches and contactors in accordance with manufacturer’s recommendations. Motor Starter   Annual:  Manually operate switches and circuit breakers to verify correct operation. Operate starter unit using all manual and automatic control devices to ensure correct operation. Verify correct interlocking action with other associated equipment. Verify correct indicating light operation. Verify equipment alarms Automatic Transfer Switches   Annual:  
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