Overhead power distribution line single-phase grounding fault positioning method

A technology for single-phase ground faults, power distribution lines, applied in the direction of fault location, measurement of electricity, measurement of electrical variables, etc.

Inactive Publication Date: 2013-06-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Overhead power distribution line single-phase grounding fault positioning method
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  • Overhead power distribution line single-phase grounding fault positioning method

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[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0036] A method for locating a single-phase ground fault of an overhead power distribution line, the method comprising the steps of:

[0037] (1) Place the fault indicator:

[0038] According to the requirements, make the fault indicator into a square coil of 15cm*15cm. The coil is wound on a ferrite with a relative magnetic permeability of 2000, and the number of winding turns is 500 turns. By analyzing the characteristics of the spatial magnetic field direction around the line after the fault, the suspension position and placement direction of the fault indicator can be obtained.

[0039]In the overhead power distribution line, when the line erected on the tower has no angle change, when the fault indicator is...

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Abstract

The invention relates to an overhead power distribution line single-phase grounding fault positioning method based on space magnetic field waveform characteristics, and belongs to the technical field of faults of an electric power system. The method includes arranging fault indicators and positioning faults by a time-difference-of-arrival method through a mobile measurement device. When a power distribution line is in heavy-current (>/=7A) fault, the fault indicators act to realize positioning of faults correctly; and when the power distribution line is in low-current (<7A) fault, the fault indicators do no actions, fault branches are cut off from branch points, and single-peak pulse signals are injected into a transformer substation. The method has high accuracy and can be used for solving the problem about positioning of overhead power distribution line single-phase grounding faults, and has important application in the technical field of fault detection of the electric power system.

Description

technical field [0001] The invention relates to a method for locating a single-phase ground fault of an overhead power distribution line, in particular to a method for locating a single-phase ground fault of an overhead power distribution line based on the waveform characteristics of a space magnetic field, and belongs to the technical field of power system faults. Background technique [0002] During the operation of the power system, failures often occur. The unplanned power supply interruption caused by the failure will stop production, cause chaos in life, and even endanger the safety of people and equipment, resulting in very serious consequences. The statistics of the power system show that most of the faults during the operation of the distribution network are short-circuit faults, and more than 90% of them are single-phase ground faults. The main cause of short circuit is that the phase-to-phase insulation or phase-to-ground insulation of the current-carrying part of...

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Application Information

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IPC IPC(8): G01R31/02G01R31/08
CPCY04S10/52
Inventor 赵志斌姜晨王芳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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