Distribution network line fault location method and system

A technology of line fault and location method, which is applied in the direction of fault location, fault detection according to conductor type, and electrical measurement, so as to improve the reliability and intelligence level of power supply, reduce the burden of operation and maintenance, and shorten the time for troubleshooting

Active Publication Date: 2022-04-12
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] This application provides a distribution network line fault location method and system to solve the technical problem of accurately determining the location of the fault in the distribution network

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  • Distribution network line fault location method and system
  • Distribution network line fault location method and system
  • Distribution network line fault location method and system

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[0066] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application.

[0067] See attached figure 1 , figure 1 A schematic flowchart of a method for locating a distribution network line fault provided by an embodiment of the present invention is shown. Attached below figure 1 The method for locating a distribution network line fault provided by the embodiment of the present application will be describe...

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Abstract

In the distribution network line fault location method and system provided by this application, when a fault occurs in the distribution network, a pulse voltage signal will be generated, and the partial discharge detection sensor closest to the fault point o will detect the largest apparent discharge, and then analyze the Detected maximum apparent discharge capacity q x And the corresponding position x, find out the detection positions y, z on both sides of the position x, and the apparent discharge quantity q detected at the position y y , Apparent discharge q detected at position z z , and then according to q x ,q y ,q z and the attenuation coefficient of the pre-stored pulse voltage signal in the distance between position x and position y and the propagation process between position x and position z to judge that the fault point o is located in the interval between position x and position y or between position x and position z; according to the pre-stored position Calculate the distance between x and position y and the distance between position x and position z to calculate the distance from fault point o to position x, and then complete the fault location. The technical solution can quickly and accurately realize online distance measurement and fault location.

Description

technical field [0001] The present application relates to the technical field of power grid fault detection, in particular to a fault location method and system for distribution network lines. Background technique [0002] As a supply-demand link connecting the transmission network and power users, the distribution network has the characteristics of many changes in line structure and complex fault conditions. Line faults will seriously affect the safe and stable operation of the power grid. The most common faults in distribution lines are single-phase ground faults and For latent faults, accurate fault location is the key technology to reduce power outage time and speed up power supply restoration. How to improve the fault location speed and reduce the difficulty of fault location is an urgent problem to be solved by those skilled in the art. [0003] At present, the commonly used fault location methods are: The first method: use the recording signal and fault briefing infor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/12
CPCG01R31/086G01R31/088G01R31/1272
Inventor 刘红文张春丽柴晨超王科
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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