SFRA Testing
SFRA (Sweep Frequency Response Analysis) is the most sensitive technique for detecting mechanical deformation of power transformer windings and core — damage that can occur during short-circuit events, transportation incidents, or seismic events. Green Watt's SFRA systems allow asset managers to assess whether a transformer's internal geometry has changed without opening the tank.
Key Features
- Wide frequency sweep: 20 Hz to 2 MHz for full winding, core, and bushing coverage
- High dynamic range: up to 100 dB for detecting subtle deformation signatures
- Complete sweep in under 1 minute per winding terminal pair
- Standard test connections per IEC 60076-18 / CIGRE TB342
- Automatic comparison against stored baseline with deviation reporting
- Fingerprint database for trend analysis across multiple measurement campaigns
- PC software with phase angle plots and automated assessment
- Lightweight portable unit in a single carry case
Applications
- ›Post-short-circuit assessment before returning a transformer to service
- ›Pre- and post-transportation fingerprinting for new and repaired transformers
- ›Routine asset condition assessment for transformer life management
- ›Post-seismic event verification
- ›Ranking transformers for prioritised refurbishment or replacement
Technical Specifications
| Frequency Range | 20 Hz to 2 MHz |
| Dynamic Range | Up to 100 dB |
| Test Time | < 1 minute per terminal pair |
| Standards | IEC 60076-18, CIGRE TB342, IEEE C57.149 |
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