대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 2008년도 추계학술대회 논문집 전력기술부문
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- Pages.12-15
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- 2008
CT와 CCVT의 오차를 고려한 거리 계전기의 응동 분석
Analysis of the response of a distance relay considering the errors of CT and CCVT
-
강용철
(전북대학교 전자정보 공학부)
;
- 정태영 (전북대학교 전자정보 공학부) ;
- 최재선 (전북대학교 전자정보 공학부) ;
- 강해권 (전북대학교 전자정보 공학부) ;
- 김광무 (전북대학교 전자정보 공학부) ;
- 장성일 (전북대학교 전자정보 공학부) ;
- 김용균 (한국 아이이디 이엔지)
-
Kang, Yong-Cheol
(Chonbuk National University)
;
- Zhang, Tai-Ying (Chonbuk National University) ;
- Choi, Jae-Sun (Chonbuk National University) ;
- Kang, Hae-Gweon (Chonbuk National University) ;
- Kim, Kwang-Moo (Chonbuk National University) ;
- Jang, Sung-Il (Chonbuk National University) ;
- Kim, Yong-Gyun (Hankook IED ENG. Inc.)
- 발행 : 2008.11.07
초록
A distance relay has been widely used for transmission line protection. The distance relay detects a fault based on the calculated impedance i.e. the ratio of the voltage to the current measured from a current transformer (CT) and a coupling capacitor voltage transformer (CCVT), respectively. When a fault occurs and a CT saturates due to the magnitude of fault current, dc component, primary time constant, and the remanent flux of the iron core, the secondary current of a CT is distorted On the other hand, non-fundamental components generated during a fault can increase the error of a CCVT, particularly when a fault distance is short. The distortion of the current and voltage can cause mal-operation or the operating time delay of a distance relay. This paper describes the response of a distance relay considering the errors of a CT and a CCVT. The results indicate that the severe distortion of a CT and a CCVT have noticeable effect to a distance relay.
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