Description
ISA STS 5000 Substation Test Set Repair
The ISA STS 5000 is a multifunction substation test system — it combines relay testing, with high-current and high-voltage sources and precision measurement, to commission and maintain protective relays, CTs/VTs, and substation equipment. As a multi-source, multi-measurement system, its faults span the output (amplifier/source) stages, the measurement channels, and the control electronics.
June Company repairs and calibrates the ISA STS 5000 for substation commissioning and relay-test crews.
Common ISA STS 5000 problems we fix
- Output-stage rebuilds — a voltage or current source weak or dead, repaired so every source meets rated output.
- Measurement-channel recalibration — measurement inputs drifting, recalibrated against standards.
- Timing / phase accuracy off — the timing and phase reference, corrected.
- Won’t connect to the control PC — interface faults, repaired.
- Display, control, or power faults.
FAQs
One of my STS 5000 sources is down — fixable? Yes. Output-stage failure is repairable, then all sources and measurement channels are verified against our standards with NIST-traceable calibration.
Are timing and phase verified? Yes — checked and certified along with the sources.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or submit a service request.






