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A method for fast identification of transmission line faults

A technology of transmission lines and discrimination methods, which is applied in the direction of fault location, fault detection according to conductor type, and electrical measurement. It can solve problems that cannot meet the needs of the development of modern power grids, and achieve the effect of improving safety and stability margins and increasing operating speed.

Active Publication Date: 2020-03-27
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Traditional relay protection generally relies on power frequency phasors, and its action speed generally requires several power frequency cycles, which can no longer meet the needs of modern power grid development

Method used

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  • A method for fast identification of transmission line faults
  • A method for fast identification of transmission line faults
  • A method for fast identification of transmission line faults

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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] The present invention proposes a method for quickly discriminating faults of the transmission line aiming at the requirement of the current high-voltage AC transmission line on the protection action speed.

[0029] In the embodiment of the present invention, when a short-circuit fault occurs on the line, the three-phase measured voltage and current and the memory voltage at the protection installation are first subjected to the same low-pass filtering pr...

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Abstract

The invention discloses a rapid judgment method for faults of transmission lines. The rapid judgment method comprises the following steps: carrying out same low-pass filtering on a three-phase measuring voltage and current and a memory voltage at a protective mounting site; calculating a set-point voltage by combining with the measuring voltage and current at the protective mounting site after low-pass filtering based on a line model; detecting whether the measuring voltage at the faulted protective mounting site is lower than a threshold value, if not, carrying out comparison on the polarityof the set-point voltage in a short time window after the fault and the polarity of the measuring voltage at the protective mounting site, if the polarities are the same, determining the fault as an external fault, and if the polarities are opposite, determining the fault as internal fault; and if the measuring voltage at the faulted protective mounting site is lower than the threshold value, carrying out comparison on the polarity of the memory voltage at the protective mounting site and the polarity of the set-point voltage, if the polarities are the same, determining the fault as a reversefault and omitting the operation, and if the polarities are opposite, determining the fault as a positive direction fault. According to the rapid judgment method, the faults of the transmission linescan be rapidly judged, and the problems in the judgment of three-phase fault direction judgment of an outlet can be effectively solved.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a method for quickly distinguishing transmission line faults. Background technique [0002] The action speed of transmission line relay protection is of great significance to ensure the safe and stable operation of the power grid. As the voltage level of transmission lines increases and the transmission capacity further increases, high-speed fault discrimination methods are of great significance for further improving the safe and stable operation of the power grid. [0003] Traditional relay protection generally relies on power frequency phasors, and its action speed generally requires several power frequency cycles, which can no longer meet the needs of modern power grid development. Therefore, how to further improve the transmission line fault discrimination speed is a problem that those skilled in the art need to solve at present. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 胡列翔裘愉涛文明浩陆承宇王松戚宣威汪冬辉方芳杨涛阮黎翔吴栋萁陈明陈玉蔡宜君
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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