Analysis of evaluating methods for transformer chopped impulse tests
Power transformers must be tested under high voltage impulse tests with full-length and chopped wave- forms. This paper compares different evaluation methods used for lighting impulse chopped tests, showing the advantages and drawbacks of them. The evaluation technique compares voltage and current w...
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| Main Author: | |
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| Other Authors: | , |
| Format: | article |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | https://hdl.handle.net/20.500.12008/42658 |
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| Summary: | Power transformers must be tested under high voltage impulse tests with full-length and chopped wave- forms. This paper compares different evaluation methods used for lighting impulse chopped tests, showing the advantages and drawbacks of them. The evaluation technique compares voltage and current wave- forms corresponding to reduced-level and full-level voltages. Any difference between the waveforms may correspond to a failure in the transformer under test. However, with chopped waveforms, impulse genera- tors may have significant differences in the time of chopping, so that low-level and full-level waveforms are different, making difficult to get a conclusion on the test result. Typical evaluating methods and a new recently proposed algorithm are compared using different power transformers and chopping times. |
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