Power distribution network line fault positioning method and system

A technology for line faults, location methods, applied in fault locations, information technology support systems, fault detection by conductor type, 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 fault location method and system for a distribution network line to solve the technical problem of accurately determining the location of a fault in a distribution network

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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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Embodiment Construction

[0065] 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 creative efforts shall fall within the protection scope of this application.

[0066] See attached figure 1 , figure 1 A schematic flowchart of a distribution network line fault location method 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 described.

[0067] Suc...

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Abstract

The invention provides a power distribution network line fault positioning method and system. When a single-phase earth fault and a latent fault happen to the power distribution network, a pulse voltage signal is generated, a partial discharge detection sensor closest to a fault point o detects the pulse voltage signal at first, the moment tx when the pulse signal is firstly detected and the corresponding position x are then analyzed, the detection positions y and z on two sides of the position x, and the moment ty when a first pulse voltage signal relative to the power frequency voltage signal is detected at the position y, and the moment tz when the first pulse voltage signal relative to the power frequency voltage signal is detected at the position z are found out, and then whether thefault point o is located between the position x and the position y or between the position x and the position z is determined, and finally the specific position of the fault point o away from the position x is respectively calculated, and thereby positioning of the fault is completed. The method is advantaged in that online distance measurement and fault positioning can be rapidly and accurately realized, and power supply reliability of a power grid is effectively improved.

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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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/12
CPCG01R31/086G01R31/088G01R31/1272Y04S10/52
Inventor 刘红文赵现平张春丽王科
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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