Coal mine grid system insulation state monitoring method

A high-voltage power grid, insulation state technology, applied in the direction of measuring electricity, measuring devices, short-circuit testing, etc., can solve the problems of feasibility discount, poor effect, etc., and achieve the effect of low cost, simple online monitoring device, and elimination of stray current
CN103135031AActive Publication Date: 2013-06-05CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Publication Date
2013-06-05

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Abstract

The invention provides a coal mine grid system insulation state monitoring method and belongs to an electrical power system feed line insulation state monitoring method. A feed line branch circuit is selected for doing single-phase longitude metal grounding experiment, zero sequence voltage of a bus and zero sequence current of a non-malfunction branch circuit are tested, zero sequence impedance of the non-malfunction branch circuit is obtained, namely, insulation resistance and ground capacitance, for obtaining insulation parameters of all circuits, another branch circuit is reselected to do a single-phase connection low resistance ground experiment or the next circuit with the non-branch-circuit number 1 is waited for generating single-phase ground malfunction, the experiment is repeated, insulation parameters of a first experiment malfunction circuit are obtained, and the insulation parameters of all feed line branch circuits are obtained by synthesizing results of the two experiments. The coal mine grid system insulation state monitoring method has the advantages that insulation degradation degree of the circuits is analyzed from state change of the bus zero sequence voltage and an arc suppression coil, the zero sequence voltage changes to a certain extent, switching-in situations of damping resistance change, and the degradation degree of circuit insulation is forecasted by monitoring change of transient states of a plurality of feature quantities.
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Description

technical field

[0001] The invention relates to a method for monitoring the insulation state of a power system feeder, in particular to a method for monitoring the insulation state of a high-voltage power grid in a coal mine. Background technique

[0002] More than 80% of the accidents in the high-voltage power system are insulation accidents. With the development of power supply and scientific progress, higher requirements are put forward for the reliability and safety of the power supply system. The traditional method of insulation detection in the original power failure test It has been increasingly unable to meet the actual production needs, and it is an inevitable development trend to use insulation on-line monitoring technology for grid insulation diagnosis. In recent years, my country has done a lot of research on cable insulation on-line monitoring, and achieved certain results, but the measurement errors are relatively large. Among the original measurement methods,...

Claims

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