Full scale lightning surge tests of distribution transformers and secondary systems
| Autor: | R.C. Dugan, L.D. Rowe, G.L. Goedde |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Engineering
business.industry Full scale Energy Engineering and Power Technology Structural engineering Lightning arrester Distribution transformer law.invention Lightning strike law Overvoltage Forensic engineering Electrical and Electronic Engineering Power-system protection business Transformer Failure mode and effects analysis |
| Zdroj: | Proceedings of the 1991 IEEE Power Engineering Society Transmission and Distribution Conference. |
| DOI: | 10.1109/tdc.1991.169581 |
| Popis: | Low-side surges are known to cause failures of distribution transformers. They also subject load devices to overvoltages. A full-scale model of a residential service has been set up in a laboratory and subjected to impulses approximating lightning strokes. The tests were made to determine the impulse characteristics of the secondary system and to test the validity of previous analyses. Among the variables investigated were stroke location, the balance of the surges in the service cable, and the effectiveness of arrester protection. Low-side surges were found to consist of two basic components: the natural frequency of the system and the inductive response of the system to the stroke current. The latter component is responsible for transformer failures while the former may be responsible for discharge spots often found around secondary bushings. Arresters at the service entrance are effective in diverting most of the energy from a lightning strike, but may not protect sensitive loads. Additional local protection is also needed. The tests affirmed previous simulations and uncovered additional phenomena as well. > |
| Databáze: | OpenAIRE |
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