Distributed line fault detection and positioning system and method

A line fault and positioning system technology, which is applied in the radio wave measurement system, fault location, positioning, etc., can solve the problem of low fault identification and positioning accuracy, ineffective positioning of arc faults on transmission and distribution lines, and high investment costs for monitoring faults, etc. question

Active Publication Date: 2021-02-12
CHONGQING UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a distributed line fault detection and positioning system and method to solve the problem of insufficient effectiveness in the prior art for arc fault positioning of power transmission and distribution lines, low fault identification and positioning accuracy, and high investment costs for monitoring faults. The need for power outage installation brings inconvenience to installation and maintenance

Method used

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Embodiment approach

[0076] An optional implementation manner, the signal acquisition module also includes:

[0077] a filtering unit, configured to filter the collected electromagnetic radiation signal;

[0078] an amplifying unit, configured to amplify the filtered electromagnetic radiation signal;

[0079] The data acquisition unit is used to collect the amplified electromagnetic radiation signal.

[0080] In an optional implementation manner, the filtering unit adopts a band-pass filter with a bandwidth of 30-120 MHz, and the amplifying unit adopts an amplifier with a gain of 15 dB.

[0081] In an optional implementation manner, the signal collection module further includes a GPS time synchronization unit, configured to control the sampling frequency of the data collection unit for collecting electromagnetic radiation signals. Using the GPS time synchronization unit set at each site to control the sampling frequency of the site’s data acquisition unit can realize the synchronization of multi...

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Abstract

The invention discloses a distributed line fault detection and positioning system which is mounted at each of a plurality of stations, wherein the system comprises a signal acquisition module, a signal analysis module and a fault positioning module; the signal acquisition module is used for acquiring electromagnetic radiation signals generated by electric arc faults generated by lines in an area to be detected; the signal analysis module is used for analyzing the frequency spectrum characteristics of the collected electromagnetic radiation signals, extracting characteristic parameters, comparing the extracted characteristic parameters with a preset characteristic threshold value respectively, and judging whether an electric arc fault occurs in the line or not; and the fault positioning module is used for determining the position of the electric arc fault based on the time difference of arrival positioning principle when judging that the electric arc fault occurs in the line. The invention discloses a distributed line fault detection and positioning method. According to the invention, the electric arc fault can be effectively detected by using the electromagnetic radiation signals generated by the electric arc fault, and the fault can be accurately positioned.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution lines in electric power systems, in particular to a distributed line fault detection and location system and method. Background technique [0002] The transmission and distribution lines of the power system are an important part of the power grid. With the continuous expansion of the scale of the power grid, especially the medium-voltage overhead lines, there are many branches and complex feeder structures. Therefore, the intelligent fault detection and location of power transmission and distribution lines put forward higher requirements. Timely and accurate positioning of power system faults can greatly improve the safety and stability of power grid operation. The existing transmission and distribution line fault location technology mainly collects electrical quantities such as voltage and current, and performs inversion in combination with the line model. However, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/12G01S5/06
CPCG01R31/085G01R31/088G01R31/1272G01S5/06Y04S10/52
Inventor 杨庆韦思宇周桐罗曼丹
Owner CHONGQING UNIV
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