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송전선로 거리표정치에 대한 실 고장거리의 확률적 예측방안
이용희(Y.H Lee),백두현(D.H Back),장석한(S.H Jang) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The fault location is obtained from the distance relay that detects the fault of the transmission line. In this time, transmission line crews track down the fault location and the reasons. However, because of having error at the fault location of the distance relay, there is a discordance between real and obtained fault location. As this reason, the inspection time for finding fault location can be longer. In this paper, we proposed the statistical (regression)analysis method based on each type of relay's the historical fault location data and the real fault distance data to improve the problems. With finding the regression equation based on the regression analysis, and putting the relay fault location into that equation, the real fault distance is calculated. As a result of the prediction fault location, the inspection time of transmission line can be reduced.
설비의 고장을 데이터를 이용한 변전소 신뢰도 분석 연구
이용희(Y.H Lee),백두현(D.H Baek),장석한(S.H Jang) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The most crucial requirement of a power system is to supply quality electric energy to customers without interrution, this problem is directly related to reliability of power system. Reliability assessment of power system has been an important topic for the past several decades. This paper deals with reliability assessment of a 154㎸ power substation in KEPCO. In this paper, exponential distribution is used to calculate reliablity index. The failure rate data that are utilited for reliablity index based on the realistic system. Also, FTA(Fault Tree Analysis) is used to compute substation reliablity