Testing transformers while they are enclosed in a tank containing insulating oil can be a hassle. To untank a transformer takes several people, resulting in higher labor costs and much longer test time and effort. With the advancement of technology, now testing transformers for mechanical failure, electrical shorts and winding deformation without untanking is possible.
A Sweep Frequency Response Analyzer is used to test transformers without having to remove them from their tank. The analyzers work by sending out a test signal and evaluating the frequencies generated. The RLC components of the transformer resonate when the test signal is applied. The frequencies generated serve as the “fingerprint” of the transformer. Changes in the physical configuration of the transformer will cause a change in the RLC values and the generated frequencies.
One such analyzer available today is the Doble M5400 Sweep Frequency Response Analyzer. The unit has a frequency response of 10 Hertz to 25 MegaHertz. It also features easy setup and automated testing for quick and convenient diagnostics.
The Doble M5400 Sweep Frequency Response Analyzer allows for deviations identification and the confirmation of internal mechanical problems, such as:
- Core movement
- Winding deformation and displacement
- Faulty core grounds
- Partial winding collapse
- Hoop buckling
- Broken or loosened clamping structures
- Shorted turns and open windings