Transformer Field Testing
Power transformers are the most expensive single asset in any substation and the most painful to lose. We run the full transformer field-testing menu, on-site or in a mobile setup, with results reviewed by experienced engineers — not just a printout.
- Dissolved gas analysis (DGA)IEEE C57.104 / ASTM D3612
- Oil quality analysis — moisture, dielectric, acidity, IFTASTM D1533 / D877 / D974 / D971
- Doble power factor and capacitanceIEEE C57.152 — 7.2
- Turns ratio (TTR) on all tapsIEEE C57.152 — 7.2.2
- Winding resistance with heat-run correctionIEEE C57.152 — 7.2.3
- Sweep frequency response analysis (SFRA)IEEE C57.149
- Oil treatment — dehydration, degassing, leak repair
- Tap-changer maintenance and contact replacement
IEEE C57.104 · IEEE C57.149 · IEEE C57.152 · ASTM D3612 · NFPA 70B
GSU, power, and distribution transformers from 500 kVA to 500 MVA; oil-filled, dry-type, and pad-mount.
Every visit ends with a documented report: raw test data, calibrated instrument records, anomaly findings with severity ranking, photos, and a clear recommended-action list. Trends are tracked across visits.
Send a scope or a list of assets and we’ll respond within one business day with crew availability and a proposal.
Documented acceptance tests on new substation equipment before energization.
NFPA 70B and IEEE-aligned periodic testing to keep substation equipment in service.
Contact resistance, timing, HiPot, and primary injection on oil, vacuum, and air breakers.
VLF tan delta, partial discharge, insulation resistance, and HiPot on medium-voltage cable.
Thermographic surveys of energized substations with documented anomaly reports.
IEEE 450 / 1188 testing on station batteries, chargers, and DC distribution.
24/7 availability with same-day or next-day field dispatch.
Routine and detailed walkdowns — safety, asset condition, NERC PRC-005 readiness.
A failed 230 kV autotransformer replaced and returned to service under emergency conditions — full transformer testing and commissioning by our crew.
Four TECO power transformers elevated onto flood-hardened platforms at MacDill AFB, with full apparatus testing prior to return to service.