High Voltage Switchgear Maintenance Checklist
A maintenance checklist for HV switchgear covering visual inspection, circuit breaker operation, protection relay testing, and thermographic surveys — for specialist electrical maintenance teams.
What is a hv switchgear maintenance checklist?
A high voltage switchgear maintenance checklist is a structured list of the 11 preventive maintenance tasks — covering visual, functional, safety and record-keeping checks — that keep a high voltage switchgear running safely and reliably. It groups routine checks by frequency, from daily inspections to annual servicing, so FM teams and building engineers can plan and evidence preventive maintenance.
Core hv switchgear checks
- Visual inspection of switchgear panels for signs of overheating, tracking, or damage
- Perform thermographic survey of all accessible connections and busbars
- Check earth connections and earth fault indicators
- Record transformer tap positions and load readings
What is a high voltage switchgear?
High voltage switchgear distributes and protects the primary electrical supply in large commercial buildings, typically operating at 11kV or 6.6kV. It contains circuit breakers, protection relays, busbars, and metering equipment housed in metal-clad compartments. HV switchgear requires specialist maintenance by authorised and competent persons due to the lethal voltages and fault energy levels involved.
Typical HV switchgear maintenance checklist
A practical starting point for planned preventive maintenance. Always refer to the manufacturer's O&M manual and site-specific requirements.
Visual Checks
- Visual inspection of switchgear panels for signs of overheating, tracking, or damage
- Check panel ventilation openings are clear and fans operational
- Inspect cable terminations and connections for signs of deterioration
Functional Checks
- Perform thermographic survey of all accessible connections and busbars
- Check circuit breaker trip counters and mechanism operation (where possible without de-energisation)
- Verify protection relay settings match the protection coordination study
Safety Checks
- Check earth connections and earth fault indicators
- Verify all interlocks and access restrictions are functional
Record Keeping
- Record transformer tap positions and load readings
- Review the single line diagram against actual installation
- Record all readings, thermal images, and inspection findings
Typical maintenance frequency
Suggested intervals for high voltage switchgear maintenance. Actual frequencies should follow manufacturer guidance and site-specific risk assessments.
Annually
- •Visual inspection
- •Thermographic survey
- •Protection relay check
- •Record load readings and trip counter
Every 6 Months
- •Full switchgear maintenance shutdown
- •Circuit breaker servicing
- •Insulation resistance testing
- •Contact resistance testing
- •Protection relay testing
Common faults and issues
Issues to be aware of when maintaining high voltage switchgear equipment.
Safety and compliance notes
Key safety considerations for high voltage switchgear maintenance. This is general guidance only — always follow OEM instructions, statutory requirements, and your organisation's safe systems of work.
Managing HV switchgear documentation with PM Assist
PM Assist helps FM and building operations teams search their O&M manuals and building drawings in seconds. Upload your high voltage switchgear documentation and ask questions like “When was the last inspection carried out?” or “What are the rated specifications?” — and get source-cited answers instantly.
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Frequently asked questions
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