Power distribution network line fault positioning method and system

A technique for line faults, location methods, applied in fault locations, fault detection by conductor type, electrical measurements, etc.

Active Publication Date: 2020-05-19
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a distribution network line fault location method and system to solve

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  • Power distribution network line fault positioning method and system
  • Power distribution network line fault positioning method and system
  • Power distribution network line fault positioning 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

The invention provides a power distribution network line fault positioning method and system. When a power distribution network fails, a pulse voltage signal is generated. The apparent discharge capacity detected by a partial discharge detection sensor closest to a fault point o is maximum, the detected maximum apparent discharge capacity qx and the corresponding position x are then analyzed, detection positions y and z on two sides of the position x, the apparent discharge capacity qy which is detected at the position y, and the apparent discharge capacity qz which is detected at the positionz are found out, whether the fault point o is located between the position x and the position y or between the position x and the position z is judged according to QX, QY, QZ, a distance between theposition x and the position y of prestored pulse voltage signals and an attenuation coefficient between the position x and position z ofin the propagation process;, a distance from the fault point o to the position x is calculated according to the pre-stored distance between the position x and the position y and the distance between the position x and the position z, and positioning of the fault is completed. The method is advantaged in that online distance measurement and fault positioning can be rapidly and accurately realized.

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...

Claims

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Application Information

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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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