Transformers
Installation, testing and energisation support for transformers, with tests selected for the transformer type, rating and manufacturer requirements.
Typical situations
- A new transformer has arrived on site and needs receiving inspection.
- A transformer needs installation or installation supervision.
- Pre-energisation tests and protection checks are required.
- An existing transformer needs condition testing or oil analysis.
What we do
- Installation and installation supervision.
- Receiving inspection.
- Insulation resistance (IR) testing.
- Transformer turns ratio (TTR) and winding checks.
- Protection checks and energisation support.
Confirmed after survey or agreed separately
- Test selection depends on whether the transformer is oil-filled or dry-type, its rating and the manufacturer's requirements.
- Oil analysis is carried out by a laboratory; we coordinate sampling and reporting where agreed.
- Authority to energise rests with the asset owner and, where applicable, the utility. We support the energisation; we do not approve it.
Engineering interfaces
- MV switchgear and protection
- LV main distribution
- Earthing system
- Utility connection, where applicable
Typical deliverables, as agreed
- Receiving inspection record
- Test records
- Laboratory oil report, where coordinated
- Pre-energisation checklist
Frequently asked questions
Are IR and TTR tests enough to commission a transformer?
Not on their own. They are part of a test scope that depends on the transformer and the installation. The full set of checks is agreed for each transformer.
Do you test dry-type transformers?
Yes, with a test scope suited to dry-type construction. Oil-related tests apply only to oil-filled units.