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지중관로에서의 실제 허용전류 산출을 위한 도체온도 계산 알고리즘 개선에 관한 연구
이향범(Hyang-Beom Lee),이병철(Byung-Chul Lee),김정훈(Jung-Hoon Kim),남용현(Yong-Hyun Nam),강지원(Ji-Won Kang) 대한전기학회 2018 전기학회논문지 Vol.67 No.3
In this paper, the improvement of the conductor temperature calculation algorithm is studied. The allowable current of the underground transmission line is determined by the conductor temperature limit. Usually to calculate the allowable current limit, the conductor temperature is assumed in the most worst environment condition. It is possible to increase the transmission capacity if the actual burial environment is considered. Therefore, in this paper an algorithm is proposed to calculate the conductor temperature by distinguishing two area of a underground transmission line condition - the manhole where the temperature sensor can be installed and the underground transmission line in which the temperature sensor can not be installed easily. When calculating the conductor temperature by the underground line in the pipeline, the existing standard describes each environment as a single soil heat resistance and one ambient temperature. In order to compensate this situation, thermal resistance model that can take into consideration the ground surface temperature and under ground temperature is proposed. It is shown that the accuracy of the proposed model is increased compared with the existing standard calculation result.