Description
Megger MRCT Transformer Tester Repair
Despite sitting in the relay-test category, the MRCT is really a current transformer test set — it performs CT excitation, ratio, polarity, winding-resistance, and saturation tests, demagnetizing the core and running the full IEEE/IEC CT characterization automatically. That makes its fault profile different from a relay amplifier: it’s the measurement and excitation circuitry that matters here, not high-power output channels.
June Company repairs and calibrates the MRCT for testing crews characterizing CTs during commissioning and maintenance.
Common MRCT problems we fix
- Excitation curve won’t run or looks wrong — the variable-voltage excitation source is central to the MRCT; when it degrades, saturation curves come out distorted. Repaired and verified.
- Ratio or phase readings off — measurement-circuit drift affecting CT ratio and phase-deviation accuracy, recalibrated against standards.
- Winding-resistance function failing — the DC resistance measurement path, restored for accurate readings.
- Demagnetization not working — the demag circuit that conditions the CT core before testing.
- Display or PC connection faults — interface and touchscreen issues.
FAQs
My excitation/saturation test gives bad curves — fixable? Yes. That points to the excitation source or its measurement loop, both repairable, then verified so your CT saturation curves are trustworthy again.
Do you certify ratio accuracy? Yes — CT ratio and phase accuracy are checked against our reference standards with a NIST-traceable certificate.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or submit a service request.
