Maintenance Testing
Maintenance testing is what separates a substation that runs for thirty years from one that fails in twelve. We follow NFPA 70B intervals and the relevant IEEE field-testing guides to test transformers, breakers, relays, and ground systems on a schedule, with a written report after every visit so engineers can see trends, not just snapshots.
- Scheduled test rounds on each asset (annual / triennial)NFPA 70B
- Doble power-factor tip-up testing on transformersIEEE C57.152 — 7.2
- Breaker timing, travel, and contact resistanceIEEE C37.09 / IEEE C37.10
- Relay calibration and trip-curve verificationANSI/IEEE C37.233
- Ground resistance and grid integrityIEEE 81
- Infrared thermography survey under loadNFPA 70B — 11.17
NFPA 70B · IEEE C57.152 · IEEE C37.09 · IEEE C37.10 · IEEE C37.233 · IEEE 81
All substation primary apparatus, control house, relay panels, station service, and grounding systems.
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.
DGA, oil quality analysis, TTR, Doble power factor, and SFRA on power transformers.
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.