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Electrical medium voltage maintenance

General Inspection

Check for any physical damage or wear on the medium voltage equipment

Inspect the insulation system for signs of deterioration or discoloration

Verify the proper functioning of protective devices and relays

Ensure the presence and legibility of equipment labels and warning signs

Inspect the grounding system for corrosion or loose connections

Review the documentation and drawings for any updates or discrepancies

Switchgear and Circuit Breakers

Verify the correct operation of all switches and breakers

Inspect the contacts and operating mechanisms for wear or damage

Check for any signs of overheating or abnormal operation

Verify the proper functioning of interlocks and safety mechanisms

Lubricate moving parts as per manufacturer's recommendations

Test the insulation resistance of circuit breakers and busbars

Transformers

Inspect the transformer for any signs of leaks or oil degradation

Verify the proper functioning of cooling systems and fans

Check the condition of bushings, tap changers, and connections

Test the insulation resistance and winding resistance

Inspect the grounding and bonding of the transformer

Protective Relays and Metering

Perform functional tests on protective relays and trip circuits

Verify the correct settings and coordination of relays

Calibrate and test all metering devices for accuracy

Inspect wiring and connections for proper termination

Review the event logs and reset any alarms or faults

Verify the communication interfaces with control systems

Cables and Terminations

Inspect the cable insulation for any signs of damage or deterioration

Check the tightness and integrity of cable terminations

Test the insulation resistance of cables and joints

Verify the correct phase sequence and cable markings

Review the thermal ratings and derating factors

Grounding and Lightning Protection

Inspect the grounding system for proper connections and integrity

Check the condition of grounding electrodes and conductors

Verify the correct installation of lightning protection systems

Inspect surge arresters and verify their proper functioning

Review the grounding and bonding of ancillary equipment

Battery Systems and Backup Power

Inspect the battery banks for signs of corrosion or leakage

Verify the correct operation of battery chargers and dischargers

Test the voltage and capacity of individual battery cells

Review the maintenance logs and perform required maintenance

Check the integrity and functionality of backup power systems

Documentation and Training

Review and update equipment manuals, operation, and maintenance procedures

Ensure that all relevant drawings and documentation are up to date

Conduct training sessions for maintenance personnel on procedures and safety measures

Document any maintenance activities, repairs, or modifications performed

Review incident reports and implement corrective actions as necessary

Note: This checklist serves as a general guideline and may vary depending on the specific requirements and standards of the engineering organization and relevant regulatory bodies. It is recommended to consult applicable guidelines, standards, and manufacturer's recommendations for a comprehensive medium voltage maintenance checklist.

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