预埋管地下电缆温度场和载流量的数值计算

Numerical Computation of Temperature Field and Campacity of Underground Cables in the Pipe Covered up Beforhand

采用有限差分法,用坐标组合的方法对土壤区域,电缆区域分别进行计算,最终确定了任意敷设方式下电缆允许的载流量,通过当量导热系数的方法,解决了由于预埋管与电缆的偏心夹层带来的计算上的不便,由于土壤的导热系数对电缆的载流量有很大影响,为此特别搭建土壤导热系数实验台,用于精确的测量土壤的导热系数。

The paper uses the finite difference method, and both areas of cables and soil are incorporated in the program with combinatorial coordinates and it can finally demine the allowing capacity of cables under all varieties of laying modes. The inconvenience caused by the eccentric interlayer of the cable pipe and cable is settled by the way of equivalent coefficient of thermal conductivity. As the coefficient of heat conductivity of soil greatly influence the ampacity of cables, an experiment platform is specially manufactured. The coefficient can be accurately measured by it.