配电线路变压器参数偏差对故障定位的影响

Influence of distribute line transformer parameter difference on location of fault

配电线路单端测试故障定位要求线路模型及参数准确，但由于线路终端所接变压器参数难以一一测试，在离线状态下，对实际系统进行故障定位时，终端变压器空载参数难免存在偏差．从理论上分析了配电线路终端变压器参数偏差对线路输入端口阻抗的影响以及输入端口阻抗随线长变化的关系．分析结果说明线路终端变压器参数偏差对单端测试故障定位的影响不大．计算机仿真结果证明了所得结论的正确性．

Location of fault for radial distribution network using one terminal measurement method requires the model and the parameters of network be accurate, but the parameters of transformer are difficult to measure one by one. When locating the fault off line, there are often differences in the terminal transformer parameters. It is analyzed that the differences in terminal transformer′s parameters which have their effect on fault location using one terminal measurement method.