Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 1999.07e
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- Pages.2305-2307
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- 1999
Ultrasonic Noises in Power Transformer
전력용 변압기에서의 초음파 노이즈
- Kweon, D.J. (KEPRI) ;
- Jung, G.J. (KEPRI) ;
- Choi, I.H. (KEPRI)
- Published : 1999.07.19
Abstract
Partial discharge measurement using a ultrasonic technique allows us to detect degradation of the electrical insulation in a power transformer. However, The ultrasonic measurement studies don't offer a good solution in operating conditions. In this paper, we investigated characteristics of ultrasonic noise caused by a 345kV power transformer under operating conditions. The ultrasonic noises generated by corona in air, vibration of core, pump and fan, etc. An ultrasonic frequency caused by corona in air was appeared 9 and 18[MHz] at the outside wall of the transformer. And a spectra of core vibration was detected below 2.5[kHz]. These spectrum were compared with 20
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