The Leakage Fault Section Location In Coal Mine

It is easy to accumulate dust and gas in the coal mine, and if there has an electricleakage, it will not only cause personal electric shock but also easily occur the malignantaccident such as coal dust and gas explosion. The coal mine system generally adopts theneutral non-grounding mode, when there has an electric leakage fault, the leakage faultcurrent of this ground connection mode is small but easy to be interference. Therefore theproblem of the distinguish of mine power grid leakage fault problem has not been solvedvery well.The simulation model of mine power supply system was established in Matlab, thenanalysis and simulated different leakage fault situation. Using the method of parameteridentification principle to judge whether the circuit line has electric leakage fault,because of the rich information and bootstrap of the parameter identification principle,we don’t need to compare each branch, so it can reliably identify whether the line has anelectric leakage by using parameter identification principle.The coal mine power always use single power radial arteries type network, whichhas many branches, and which supervisor is composed of several short cable, cascaderelationship more closely. When the leakage fault occurs in lower line, the leakageprotection device of superior lines will detect the fault circuit breaker tripping. Thisrequests us to fix the location in the section accurately, and minimize the power outagerange to improve the power supply reliability.After judging the leakage fault lines, communicate between devices with theGOOSE message, realize the interconnection between each device. Accurately locate theleakage section of line, so as to realize the extent of down hole leakage fault location.