An HT switchgear preventive maintenance schedule lists the checks and jobs done on the equipment at fixed intervals, how long each takes, and in what order of frequency, so problems are found before the HT switchgear fails. This page gives the schedule used in the PlantOps360 task library for HT switchgear (vcb panel / rmu), which follows common industry practice for general-purpose equipment. It is also searched for as VCB, HT panel, 11 kV switchgear, vacuum circuit breaker.
The maker’s manual and your site safety procedures always come first where they differ. Intervals set by law differ by state.
HT switchgear preventive maintenance schedule and checklist
| How often | Task | Estimated time |
|---|---|---|
| Weekly | Check indications, relay flags, SF6 or vacuum indicator and panel heater operation | 20 min |
| Monthly | Check for abnormal noise, heat, discharge sounds or odour; check cable box condition | 30 min |
| Quarterly | Clean panel exterior and ventilation; check battery and charger for control power | 60 min |
| Half-yearly | Thermography of busbars, breaker contacts and cable terminations | 120 min |
| Annual | Breaker maintenance: mechanism lubrication, timing test, contact resistance and insulation test | 360 min |
| Annual | Relay testing and calibration: overcurrent, earth fault, differential and trip circuit | 180 min |
HT switchgear maintenance frequency and yearly workload
At the estimated times, one HT switchgear needs about 40 hours of preventive maintenance a year. The biggest single job is “Breaker maintenance: mechanism lubrication, timing test, contact resistance and insulation test” at 360 minutes, done annual. Multiply by the number of units you have to see the workload for your plant.
| Frequency | Tasks | Time per round | Hours per year |
|---|---|---|---|
| Weekly | 1 | 20 min | 17.3 h |
| Monthly | 1 | 30 min | 6.0 h |
| Quarterly | 1 | 60 min | 4.0 h |
| Half-yearly | 1 | 120 min | 4.0 h |
| Annual | 2 | 540 min | 9.0 h |
What goes wrong on an HT switchgear without preventive maintenance
- Contact wear and overheating
- Mechanism and spring faults
- Insulation tracking from dust and moisture
- Protection relay failure
What to watch between services
- Temperature at joints
- Operation count
- Relay test results
Safety and statutory notes for HT switchgear maintenance
Switching and maintenance need authorised persons, permits, isolation and earthing.
Where an HT switchgear preventive maintenance schedule is used
An HT switchgear is found in almost every industry. The industry guides below show how it fits into the wider schedule of each one:
- Preventive maintenance schedule for pharmaceutical plants
- Preventive maintenance schedule for food, dairy and beverage plants
- Preventive maintenance schedule for automotive plants
- Preventive maintenance schedule for chemical, fertiliser and petrochemical plants
- Preventive maintenance schedule for cement, glass, ceramics and building materials plants
- Preventive maintenance schedule for steel, foundry, forging and metal plants
- Preventive maintenance schedule for textile and garment mills
- Preventive maintenance schedule for thermal and hydro power plants
See all industry preventive maintenance schedules.
Related equipment maintenance schedules
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- Dry-type / cast resin transformer preventive maintenance schedule
- LT switchgear preventive maintenance schedule
- Motor control centre preventive maintenance schedule
- APFC panel and capacitor banks preventive maintenance schedule
- Uninterruptible power supply preventive maintenance schedule
- Battery bank preventive maintenance schedule
- Flooded lead-acid preventive maintenance schedule
Browse the full list of equipment preventive maintenance schedules (317 types).
Run this HT switchgear schedule in maintenance software
In preventive maintenance software, each row above becomes a recurring task on the asset with its checklist, time estimate and parts. Tasks can be triggered by calendar date, running hours, meter readings or production cycles, each completed task is recorded with the person and date, and a failed check can open a work order. For the method behind it, read the guide to the preventive maintenance schedule, or use the free generator to get a 12-month plan for your whole equipment list.
Build my preventive maintenance schedule (free Excel)
Frequently asked questions
How often should an HT switchgear be serviced?
In our schedule an HT switchgear has 6 tasks: 1 weekly, 1 monthly, 1 quarterly, 1 half-yearly, 2 annual. The biggest job is “Breaker maintenance: mechanism lubrication, timing test, contact resistance and insulation test”, which is done annual. Always follow the maker’s manual where it gives a different interval.
What is included in HT switchgear preventive maintenance?
It covers routine checks and jobs such as “Check indications, relay flags, SF6 or vacuum indicator and panel heater operation”, “Check for abnormal noise, heat, discharge sounds or odour; check cable box condition”, “Clean panel exterior and ventilation; check battery and charger for control power”, up to the annual overhaul or inspection. The full list with times is in the table above.
How many hours of maintenance does an HT switchgear need per year?
About 40 hours per unit per year at the estimated times in our library, including all scheduled rounds. Use it to plan workload, not as a benchmark.
Is there a free HT switchgear maintenance checklist?
Yes. The table on this page is a ready checklist. The free preventive maintenance schedule generator turns it into a 12-month Excel schedule for your list of equipment, with monthly workload hours.