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Fault location method using three primary colours to represent travel waves of single-phase earth fault current of transmission line

A single-phase ground fault, traveling wave three-primary color technology, applied to fault locations, emergency protection circuit devices, electrical components, etc., can solve the problem of high cost

Active Publication Date: 2012-07-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The double-ended method requires accurate time synchronization and information transmission channels at both ends of the line, and the cost of the device is higher than that of the single-ended method

Method used

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  • Fault location method using three primary colours to represent travel waves of single-phase earth fault current of transmission line
  • Fault location method using three primary colours to represent travel waves of single-phase earth fault current of transmission line
  • Fault location method using three primary colours to represent travel waves of single-phase earth fault current of transmission line

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Embodiment Construction

[0053] by figure 1 Taking the AC system as an example, a phase A ground fault occurs at a distance of 75km from the M terminal of the busbar on the MN line of length L=175km, the grounding resistance is 5Ω, the fault angle is 90°, and the sampling frequency is 1MHz. The specific implementation steps are as follows:

[0054] 1) When the mutation value of any phase current at protection 1 |i(n+1)-i(n)|-|i(n)-i(n-1)| is greater than the set value, record the time corresponding to n as At the time of the fault, the current traveling waves of the first protection point of the fault line and the reference line protection point 2 are extracted respectively, 10 ms before the fault and 1 ms after the fault, where n is the nth sampling point, and i(n) is any three-phase current The current sampling value of the nth sampling point of a phase;

[0055] 2) Extract the fault current components of protection 1 and protection 2 according to formula (1) by half cycle addition method;

[005...

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Abstract

The invention relates to a fault location method using three primary colours to represent travel waves of single-phase earth fault current of an AC transmission line. In the method, the travel waves in the direction of the fault current of the AC transmission line are represented by the three primary colours so as to realize single end fault location under the three primary colour mode and to achieve more intuitive fault location at the same time of ensuring the accuracy of the fault location. The method is carried out as follows: utilizing the travel waves in the construction direction of the current aerial model component in the case of single phase earth fault, mapping the travel waves in the fault current direction and zero model component of the fault current to the three primary colour mode, selecting former two mutation positions in which a red (R) channel and a green (G) channel have consistent colour mutation directions so as to correspond to former two wave heads coming froma fault point, and comparing the mutation direction at the second colour mutation positions of the red (R) channel and the green (G) channel; if the mutation directions are the same, the second colour mutation positions correspond to reflection waves of the fault point, otherwise, the second colour mutation positions correspond to reflection waves of an end bus. Through the method, single end fault location is finally realized.

Description

technical field [0001] The invention relates to a fault distance measurement method represented by three primary colors of traveling waves for single-phase grounding fault current of an AC transmission line, and belongs to the technical field of electric system relay protection. Background technique [0002] The three primary colors refer to the three colors of red (R), green (G), and blue (B). They are superimposed on each other to obtain a variety of colors. The three-primary color standard is one of the most widely used color systems at present. [1] . [0003] fault location [2-8] It has always been highly concerned by power workers. Single-phase ground faults on transmission lines account for about 70%-90% of the total line faults. Accurate fault location can greatly shorten line inspection time and speed up power supply restoration. Safe and economical operation is of great importance. Traveling wave fault location is a fault location method based on traveling wave ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 束洪春张敏彭仕欣
Owner KUNMING UNIV OF SCI & TECH
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