极大似然估计在小电流接地选线中的应用

 本文将极大似然估计原理引入小电流接地故障选线。建立故障选线零序网络模型，利用极大似然估计良好的辨识特性识别线路参数，通过比较故障线路和非故障线路中的电容参数是否符合模型选出故障线路。仿真结果表明，该方法简单、可靠，能有效地选出故障线路，且不受过渡电阻、消弧线圈和间歇性电弧的影响。

Application of Maximum Likelihood Estimation on Fault Line Selection in Non-Solid Earthed Network

The maximum likelihood estimation was introduced to the ground fault line selection in non-solid earthed network. In this paper, the zero-sequence network model was established. And the good identification feature of maximum likelihood estimation was used to identify the line parameters. Then, the fault line was selected by comparing whether or not the capacitances of the fault line and the non-fault line accord with the anterior model. Simulation results show that the method is simple and reliable, and it is independent of transition resistance, arc suppression coil and the intermittent arc.