Power distribution network fault point positioning method and system and electronic equipment

A technology of distribution network fault and location method, applied in fault location, information technology support system, fault detection by conductor type, etc., can solve problems such as difficulty in fault location location

Inactive Publication Date: 2019-02-01
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a method, system and electronic equipment for locating distribution network fault points, which improves the automation of distribution network fault diagnosis and solves the problems that exist when complex distribution network fails. Difficult point positioning problem

Method used

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  • Power distribution network fault point positioning method and system and electronic equipment
  • Power distribution network fault point positioning method and system and electronic equipment
  • Power distribution network fault point positioning method and system and electronic equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] see figure 1 The flow chart of the method for locating the fault point of the distribution network is shown, and the method includes the following steps:

[0054] Segmentation step S100: Divide the transmission line into multiple sections, obtain the length, unit impedance, and system impedance of each section, and calculate the terminal short-circuit current of each section. For details, see figure 2 The block-by-step flowchart shown includes the following steps:

[0055] S110. Divide the transmission line into multiple sections. According to the type of transmission line, the transmission line is segmented. Generally, there are two types of transmission lines: overhead transmission line and cable transmission line. , grounding device and other parts; the cable transmission line is a transmission system composed of communication cables and ancillary equipment. The properties and parameters of two different types of transmission lines are also different, so the seg...

Embodiment 2

[0083] Taking the specific data of the L line in a station A in a certain place as an example, the process of the method for locating the fault point of the distribution network is described in detail.

[0084] The L line in a station A in a certain place is a 10kV line, the input voltage of the transmission line is U=10500kV, the system impedance of the A station is 4.209969207Ω, the L line is composed of 4 sections, the first section is a 0.221km overhead line, and the second section is 4.854km cable line, the third section is 2.063km overhead line, and the fourth section is 5.307km cable line. Therefore, according to the segmentation steps in the location method of distribution network fault points, the transmission line is divided into 4 sections, and the length and unit impedance of each section are shown in the following table:

[0085]

length

unit impedance

Section 1

0.221km

0.4Ω / km

Section 2

4.854km

0.12Ω / km

Section...

Embodiment 3

[0103] The embodiment of the present invention also provides a positioning system for distribution network fault points, such as Figure 4 As shown, the system includes the following units:

[0104] A segmentation unit 410, configured to divide the transmission line into multiple sections, obtain the length, unit impedance, and system impedance of each section, and calculate the terminal short-circuit current of each section;

[0105] The judging unit 420 is used to judge the section where the fault point is located according to the terminal short-circuit current and the actual fault current of each section of the pre-determined set-point line;

[0106] The positioning unit 430 is configured to calculate the specific location of the fault point in the section where the fault point is located according to the line impedance, unit impedance and the actual fault current of the section where the fault point is located.

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Abstract

The invention provides a power distribution network fault point positioning method and system and electronic equipment, and relates to the field of power distribution network fault diagnosis; the method comprises the steps of a segmenting step: segmenting a power transmission line into a plurality of sections, obtaining the length, unit impedance and system impedance of each section, and calculating the tail-end short-circuit current of each section; a judgment step: according to the pre-determined tail-end short-circuit current and the actual fault current of each section of the set point circuit, judging the section where the fault point is located; and a positioning step: according to the line impedance, unit impedance and the actual fault current of the section where the fault point islocated, calculating the specific position of the fault point in the section where the fault point is located. According to the method, the system and the electronic equipment, the automation degreeof fault diagnosis of the power distribution network is improved, and the problem that fault points are difficult to locate when a complex power distribution network breaks down is solved.

Description

technical field [0001] The invention relates to the field of distribution network fault diagnosis, in particular to a method, system and electronic equipment for locating distribution network fault points. Background technique [0002] The safe and reliable operation of the distribution network is directly related to the development of society. Once the distribution network line fails, it will bring great inconvenience to people's life. It is necessary to use the distribution network fault diagnosis technology for fast and accurate diagnosis. Efficient distribution network fault diagnosis technology can quickly locate the fault location, analyze the cause of the fault, propose a fault recovery plan, shorten the power outage time as much as possible, speed up the power supply recovery speed of the line, and reduce the economic loss caused by the power outage. [0003] The distribution network in some areas lacks fault location methods, the level of automation is low, and it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086Y04S10/52
Inventor 黄伟洁林江明陈楠张颖
Owner GUANGDONG POWER GRID CO LTD
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