The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Improvement of the Conductor Temperature Calculation Algorithm for Calculating the Allowable Current in the Underground Channel

지중관로에서의 실제 허용전류 산출을 위한 도체온도 계산 알고리즘 개선에 관한 연구

  • Lee, Hyang-Beom (School of Electrical Engineering, Soongsil University) ;
  • Lee, Byung-Chul (School of Electrical Engineering, Soongsil University) ;
  • Kim, Jung-Hoon (School of Electrical Engineering, Hongik University) ;
  • Nam, Yong-Hyun (School of Electrical Engineering, Hongik University) ;
  • Kang, Ji-Won (Dept. of Power Transmission Laboratory, KEPRI)
  • Received : 2018.01.30
  • Accepted : 2018.02.08
  • Published : 2018.03.01
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Abstract

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.

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References

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