Finite element method (FEM) was used to partition the area of buried cables with outer heat sources and calculate the temperature field with given cable load. Bin-search method was used to calculate the cable load until the temperature of conductor is equal to the long endurable temperature of insulation and obtain the ampacity of buried cables with outer heat source and variation of temperature of air. The result gives out the relationship of the ampacity with the distance between outside of cables and out...
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