Research On Technique Of Grounding Fault Branch Judgment Of High-voltage Distribution Power System In Mineral Well

The earth leakage protection of high voltage fence in coal mine plays a very important role in mine well's safety in production. So it has special meaning to promote the high voltage fence's earth leakage protection system's reliability and security.In this article, we spend in-depth study and analysis on mathematical model of high voltage fence. Compare different kinds of earth leakage protection theory of high voltage fence and make sure of the best earth leakage protection mode. After the analysis of the selective earth leakage protection's theory in detail. Integrate with the high voltage fence's earth leakage protection system's problem and limitation in existence. We get the key technological parameter of selective earth leakage protection of high voltage fence. After a good study with the high voltage fence's earth leakage protection system's proving method of earlier time, we put forward a new way of proving method, which simulate high voltage with low voltage to test high voltage fence's earth leakage protection system.The proving method of simulate high voltage with low voltage to test high voltage fence's earth leakage protection system mentioned in this article, is based on the considering of the difference of phase angle of zero sequence current transformer, the dynamic high voltage fence in coal mine earth leakage parameter and the false operation factor of high voltage fence's earth leakage protection system. The new proving method can simulate the real earth leakage state. It set a high degree to the result's scientificaalness and reliability. The new proving method was brought forward for first time in domestic, and it is the first class method in coal industry in domestic.The theory put forward through test validation and data analysis, it has been proved that it possess of high correctness and feasibility.