Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2002.11b
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- Pages.274-276
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- 2002
A Current Differential Relaying Algorithm for Power Transformers Using the Difference of a Differential Current
차전류의 차분을 이용한 변압기 보호용 전류차동 계전방식
- Kang, Y.C. (Chonbuk National University, NPT Center) ;
- Kim, D.S. (Chonbuk National University, NPT Center) ;
- Lee, B.E. (Chonbuk National University, NPT Center) ;
- Kim, E.S. (Chonbuk National University, NPT Center) ;
- Won, S.H. (Chonbuk National University, NPT Center)
- 강용철 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
- 김대성 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
- 이병은 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
- 김은숙 (전북대학교 전자정보 공학부, 차세대전력기술연구센터) ;
- 원성호 (전북대학교 전자정보 공학부, 차세대전력기술연구센터)
- Published : 2002.11.15
Abstract
This paper proposes a current differential relaying algorithm for power transformers using the third difference function of a differential current. The algorithm observes the instants when the wave-shape of the differential current is changed due to the change of the magnetization inductance. If the value of the third difference is bigger than the threshold, the output of a current differential relay is blocked for a cycle. In the cases of magnetic inrush and overexcitation, the blocking signal is maintained: however, for internal faults, reset in a cycle. The test results clearly show that the algorithm successfully distinguishes internal faults from magnetizing inrush.
Keywords