Information on heat conduction around an underground power cable system is required for exactly evaluating the allowable current in the system and furthermore for rationalizing its design and operation. A useful method, which is named the heat-source simulation method, is proposed for analyzing the heat conduction phenomena in practical underground power cables. This method is based on the same algorithm as the charge simulation method for electro-static field that is convenient and effective in dealing with composite material and open space. It is successfully applied to the calculation of temperature rise of practical power cables in protection pipes buried in non-uniform soil and then to the evaluation of the allowable current in the cable system.
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