대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 2001년도 하계학술대회 논문집 A
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- Pages.249-251
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- 2001
차분을 이용한 변류기 포화 검출 알고리즘의 저역통과 필터의 영향 분석
Performance Analysis on a Low Pass Filter of a CT Saturation Detecting Algorithm Using Difference of the Secondary Current
- Kang, Young-Cheol (Chonbuk National University) ;
- Ok, Seung-Hun (Chonbuk National University) ;
- Yun, Jae-Sung (Chonbuk National University) ;
- Kim, Dae-Sung (Chonbuk National University)
- 발행 : 2001.07.18
초록
This paper presents performance analysis on a low pass filter of a CT saturation detecting algorithm using difference. At the instants of beginning/end of saturation, the shapes of the secondary current are changed significantly though secondary currents are continuous. At the instants, the second-order or third-order difference of the secondary current has big values because of discontinuity of the first order difference. Thus, the third difference of the current is used to detect the beginning/end of CT saturation. An antialiasing low pass filter removes high frequency components and causes phase lag. A CT saturation detecting algorithm using difference of CT secondary currents is affected by the low pass filter. The algorithm is tested with cutoff frequencies of the filter for the two sampling rates of 64[S/C] and 32 [S/C]. The results of various test cases indicate satisfactory performance of the algorithm.
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