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Kil, Gyung-Suk;Song, Jae-Yong
- Journal of Sensor Science and Technology
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- v.7 no.4
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- pp.293-299
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- 1998
An objective of this study is to develop a voltage measuring device that uses a gas-filled switch (GS) on 22.9 kV-y extra-high voltage distribution lines. The voltage measuring device proposed in this paper is a kind of capacitive divider which consists of a detecting electrode attached outside of the bushing of GS, an impedance matching circuit, and a voltage buffer. It can be easily installed in an established GS without changing the structure. For the calibration and application investigations, the voltage measuring device was set up in the 25.8 kV 400 A GS, and a step pulse generator having 5 ns rise time is used. As a result, it was found that the frequency bandwidth of the voltage measuring device ranges from 1.35 Hz to about 13 MHz. The error of voltage dividing ratio which is evaluated by the commercial frequency voltage of 60 Hz was less than 0.2%. In addition, voltage dividing ratio in the commercial frequency voltage and in a non-oscillating impulse voltage were compared, and their deviation were less than 0.7%.
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Lee, H.C.;Park, K.S.;Yoon, D.H.;Lee, S.H.;Kim, K.C.;Lee, K.S.
- Proceedings of the KIEE Conference
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- 2003.10a
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- pp.189-190
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- 2003
현장에서 많이 사용되고 있는 GIS에 결함이 발생하면 치명적인 사고로 진전될 수가 있다. 본 논문은 모의 GIS내 도전성 파티클 존재시 발생되는 부분방전 신호를 절연 진단 방법중 하나인 UHF법을 이용해 부분방전시 방사되는 방사전자파의 스펙트럼을 분석해 부분방전 진전과정을 판단하였다. 이러한 연구는 현장 GIS 및 $SF_6$ 가스절연 전력설비의 전기적 신뢰성 확보를 위해 UHF 법을 이용한 절연진단 시스템 개발에 중요한 역할을 할 것으로 사료된다.
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