An unplanned outage costs far more than regular maintenance. Here is a summary of which checks a transformer substation needs and how often.
The power supply of a factory or a residential complex usually depends on a single transformer substation. A failure there means production stops, products are lost and emergency repairs are costly. Periodic maintenance is the most effective way to spot these risks before they turn into a fault.
What is checked?
- Thermal imaging: Loose connections and overheating points are detected with a thermal camera while under load.
- Earthing measurements: Protective and system earthing values are measured and reported.
- Protection relay tests: Relay settings and trip times are tested to confirm they will operate correctly in a fault.
- Switchgear and busbar checks: Medium-voltage cells are cleaned and connection torques and mechanical interlocks are checked.
- Transformer checks: Oil level and leaks on oil-filled units; winding temperatures and ventilation on dry-type units.
How often?
Earthing measurements must be carried out and reported at least once a year. A yearly plan is also a good starting point for thermal surveys and general checks; heavily loaded, continuously running facilities may need them more often. Maintenance is scheduled for when it affects production the least.
How we work at Birsoy
Before maintenance we review the single-line diagram and load profile and plan the shutdown together with the operator. Afterwards we report all measurements and recommended improvements and agree the date of the next visit.
