Description
Megger TTR300 Transformer Turns Ratio Tester Repair
The Megger TTR300 Transformer Turns Ratio Tester is a transformer turns ratio tester – it energises a transformer winding and measures the ratio, excitation current and phase to confirm the windings and the tap changer are intact. The measurement is a ratio, so small errors in either winding measurement compound.
June Company’s certified technicians repair the Megger TTR300 Transformer Turns Ratio Tester for utility transformer crews, substation technicians, and transformer manufacturers. Every instrument is repaired at component level and verified against reference standards before it ships back, with the measured results documented.
Common Megger TTR300 Transformer Turns Ratio Tester problems we fix
- Output drive stage failure.
- Automatic tap changer sequencing faults.
- Display, keypad or front-panel faults.
- GPIB, LAN, USB or remote-control faults – which breaks automated test sequences while the instrument still works from the front panel.
- Ratio readings inaccurate – verified across the full range rather than at a single tap, since ratio errors that appear only on certain taps are the ones most often missed.
- Excitation current measurement errors.
- Phase deviation readings incorrect.
- Test lead or clamp faults.
FAQs
Ratio is wrong on some taps but right on others. Instrument or transformer? Worth testing the set first. Tap-dependent errors are exactly what a single-point check misses, and we verify across the full range.
Are the leads tested too? Yes. Lead and clamp faults produce ratio errors that look like transformer problems.
Every repair carries a 90-day parts-and-labor warranty, with a firm quote before any work begins. Email us or submit a service request.






