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변전소 접지설계를 위한 대지저항율 측정시 전극간 최대간격이 접지해석에 미치는 영향
정길조,곽희로,최종기 대한전기학회 2001 전기학회논문지C Vol.51 No.3
Presently, typical maximum probe spacing of soil resistivity survey(Wenners 4 pin method) is 20 m in case of 154 K substation grounding design of KEPCO. This paper examined the effects of maximum probe spacing of wenner method on the equivalent soil modeling and the accuracy of grounding resistance measurement by comparing the calculated FOP(Fall-of-Potential) curves of various soil models with the measured one at 154kV H substation. The comparison results showed that the inaccurate estimation of deep soil resistivity, which is caused from the short probe spacing of soil resistivity survey, can produce large errors on measurement of grounding resistance. In this paper a quantitative analysis of FOP at H substation has been presented.
765KV 변전설비 운전중 상태감시 및 진단을 위한 전문가시스템 개발
정길조,최인혁,김광화,곽희로,Jeong, Gil-Jo,Choe, In-Hyeok,Kim, Gwang-Hwa,Gwak, Hui-Ro 대한전기학회 2001 전기학회논문지C Vol.50 No.11
In this paper, we described the export system to monitor and diagnose 765KV power apparatus. To develop this expert system, we studied the knowledge bases and data bases for 765KV transformer and GIS. In order to make the reliable inference of knowledge base and the good MMI(Man Machine Interface), the data bases were consisted of the tables of power apparatus information, limit level value, measured input data, inference result and diagnosis result. The knowledge base had various rules to infer the conditions of transformer and GIS. We applied both the forward chaining and backward chaining methods to these rules of system for good inferences. This paper describes the applied methods for expert system. Also, this developed system was tested with dissolved gas analyzing result and the result was shown.