대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 1995년도 하계학술대회 논문집 B
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- Pages.628-630
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- 1995
철심 변류기 2차 전류 보상 알고리즘
A Compensating Algorithm for the Secondary Current of Iron-cored Current Transformers
- Kang, Yong-Cheol (Seoul National University) ;
- Park, Jong-Keun (Seoul National University) ;
- Kang, Sang-Hee (Myong-Ji University)
- 발행 : 1995.07.20
초록
CT saturation may cause protective relays to malfunction. The conventional method to deal with the problem is overdimensioning of the core so that CTs can carry up to 20 times the rated current without exceeding 10 % ratio correction. However, this not only reduces the sensitivity of relays, but also increases the CT core size. This paper presents a technique of estimating the secondary current corresponding to the CT ratio under CT saturation using the magnetization curve. The proposed algorithm can improve the sensitivity of relays to low level faults and minimize the instability of relays for external faults.
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