Selects the undercurrent earth system movement method in our country 6 ~ 35KV electrical power system. The single-phase earth fault is the undercurrent earth system has the probability highest breakdown type, approximately composes all breakdowns number of times 80%. Although the regulations after stipulated the single-phase earth fault has the distribution network to be possible to continue to move 2h, but because the single-phase earth fault possibly can go a step further the development is two or the multi- spots breakdown, thus causes trips the power cut accident, therefore promptly determined the breakdown position eliminates the breakdown then to appear abreast in row extremely importantly. In order to after avoid the breakdown the occurrence or the breakdown eliminates the hidden danger as soon as possible, this article has carried on the thorough analysis and the elaboration on the undercurrent earth system single-phase earth fault. First carries on the analysis to various types neutral point earth way division and its the characteristic, when acts according to the single-phase earth fault the breakdown and the non- breakdown voltage, the electric current change characteristic, has designed the system insulation monitoring device, distinguishes the earth fault relatively according to each voltage characteristic the type and the breakdown. In addition also cancelled the arc coil blow-out principle and compensates the electrical network the action mechanism to carry on the explanation. Because the tradition pulled the road method by the line seriously to affect the power supply to be possible * the nature, the people studied proposed the many kinds of route selection plan, here 11 listed, and comprehensively carried on the synopsis and comparative analysis its advantages to these ten kind of breakdowns route selection plan principle. Finally, in order to achieve the accurate range finder the goal, has related in detail various breakdowns range finder principle, and has carried on the comparative analysis to each range finder method, the communication and the computer technology development, the beginnings and ends or in many ways range finder algorithm has provided the possibility.
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