基于高斯-赛德尔迭代法的电缆接地电流计算方法

基于经典的电缆金属护套接地电流计算模型,对原有的经典计算模型进行了改进.在接地电流计算中考虑了感应电压和电缆电容电流对实际测量数值的影响,推导出了高斯-赛德尔（Gauss-Seidel）迭代法求解接地电流计算的步骤,使计算结果更接近实际.应用计算机编程计算了南宁供电局某110 kV电缆线路的接地电流,并将计算结果与实际测量数据进行对比.分析结果显示,计算得出的数据与实际测量得到的数据大小和变化规律基本一致.此方法可作为电缆运行单位计算电缆接地电流等数据时参考.

Cable Grounding Current Calculation Method Based on Gauss-Seidel Iterative Method

Based on the classical grounding current calculation model of metal sheathed cable, the original classical calculation model is modified. The influence of the induced voltage and the capacitance current of the cable to the actual measurement value is considered in the grounding current calculation, which makes the calculation results is closer to actual value. The computer program is applied to calculate the grounding current of a certain 110 kV cable in Nanning power supply bureau, and the calculation result is compared with the actual measurement data. Analysis results show that the value and changing rules of the calculation result are basically consistent to those of the actual measurement data. The proposed method can be regarded as a reference to the cable operation department in the calculation of cable grounding current.