Transformer Turns Ratio Tester
The transformer turns ratio (TTR) test verifies that a transformer's winding ratio matches its nameplate specification and that all tap positions are correct. Green Watt's TTR tester provides fast, accurate automated ratio measurement for transformers from distribution level to EHV.
Key Features
- Automatic ratio measurement — calculates ratio and deviation from nominal
- Wide ratio range: 0.8 to 10,000+ covering distribution to EHV transformers
- Tests all OLTC and OCTC tap positions sequentially
- Phase angle measurement to verify winding polarity and vector group
- Vector group verification (Dyn11, YNyn0, etc.)
- Ratio error measurement to ±0.1% or better
- Automatic three-phase testing in a single connection setup
- Safety protection — HV detection circuit prevents incorrect connection damage
Applications
- ›Commissioning of new power and distribution transformers
- ›Periodic maintenance testing to detect tap changer problems and shorted turns
- ›Post-repair verification after transformer rewinding or bushing replacement
- ›Factory acceptance testing at transformer manufacturing works
- ›Post-lightning or fault event assessment
Technical Specifications
| Ratio Range | 0.8 to 10,000 (or higher) |
| Ratio Accuracy | ±0.1% or better |
| Phase Angle Accuracy | ±1 minute |
| Standards | IEC 60076-1, IS 2026, IEEE C57.12.90 |
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