Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)
- 2007.11a
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- Pages.349-350
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- 2007
Film Thickness Dependences of Ac High Field Dissipation Current Waveform for LDPE
저밀도 폴리에틸렌에 있어서 전압 파형의 두께 의존성
- Yun, Ju-Ho (Department of Electrical Engineering, Dongshin University) ;
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Choi, Yong-Sung
(Department of Electrical Engineering, Dongshin University) ;
- Moon, Jong-Dae (Department of Electrical Engineering, Dongshin University) ;
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Lee, Kyung-Sup
(Department of Electrical Engineering, Dongshin University)
- Published : 2007.11.01
Abstract
Polyethylene is widely used as the insulator for power cable. To investigate the conduction mechanism for power cable insulation under ac high field, it is very important to acquire the dissipation current under actual running field. Recently, we have developed the unique system, which make possible to observe the nonlinear dissipation current waveform. In this system, to observe the nonlinear properties with high accuracy, capacitive current component is canceled by using inverse capacitive current signal instead of using the bridge circuit for canceling it. As the results of these estimations, it was found that the dissipation current will depend on not only the instantaneous value of electric field but also the time differential of applied electric field due to taking a balance between applied field and internal field. Furthermore, two large peaks of dissipation current for each half cycle were observed under certain condition. In this paper, to clarify the reason why it shows two peaks for each half cycle, the film thickness dependences of dissipation current waveforms were observed by using the three different thickness LDPE films.