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Transmission line fault locating method based on reclosure

A transmission line and fault location technology, applied in fault locations, information technology support systems, etc., can solve problems such as sampling rate limitation, short existence time of traveling waves, and difficulty in identifying traveling wave wave heads, so as to avoid too short duration and improve accuracy. Effect

Inactive Publication Date: 2013-07-17
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traveling wave exists for a short time, and the difficulty of identifying the head of the traveling wave and the improvement of the sampling rate have greatly limited the application of the traveling wave method.

Method used

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  • Transmission line fault locating method based on reclosure
  • Transmission line fault locating method based on reclosure
  • Transmission line fault locating method based on reclosure

Examples

Experimental program
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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] When a fault occurs on the transmission line, a series of fault transient high-frequency components will be generated. In the fault arc stage, the fault nature is different, resulting in a small difference in the transient components. If the duration of the arc process is too short, the identification of the fault nature and the location of the fault will be difficult. bring great difficulty. After the circuit breaker trips, due to the reliable discharge of the permanent fault to the ground, the arc is extinguished relatively quickly, and the fault phase does not contain high-frequency inherent components. The existing automatic reclosing is a reclosing with a fixed time limit. In view of this, the present invention uses the transient information after the first closing of the circuit breaker to locate the fault. The main frequency f ...

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Abstract

The invention discloses a transmission line fault locating method based on a reclosure. The method includes the following steps that (1) when a transmission line breaks down, and a circuit breaker is switched on for the first time, fault phase current is collected and pre-processed, a frequency spectrum is calculated by using a Prony algorithm, and inherent frequency dominant frequency f0 is extracted; (2) after the fault phase current i(t) is pre-processed through the step (1), the frequency spectrum of the fault phase current i(t) is calculated through the Prony algorithm, and the inherent frequency dominant frequency f0 of the fault phase current i(t) is obtained; and (3) a distance between a measuring end and a fault point is calculated, and locating of the fault point is achieved. On the basis of the existing fault distance location, fault location reconfirmation can be achieved effectively. By means of the transmission line fault locating method, correct seeking of the fault point is achieved, and reliable guarantee is provided for permanent fault property identification of the reclosure.

Description

technical field [0001] The invention belongs to the technical field of relay protection for power system transmission lines, and relates to a fault location method for transmission lines based on reclosing. Background technique [0002] High-voltage transmission lines are an important part of power systems. With the increasing scale of power systems, the interconnection of power networks increases the possibility of failures on transmission lines. The rapid and accurate positioning of overhead transmission lines after faults is conducive to the rapid response and quick handling of faults by operation and maintenance personnel, thereby reducing the outage time; rapid and accurate fault positioning of long-distance and large-capacity transmission lines across regions is particularly important. [0003] At present, the fault location methods of transmission lines mainly include impedance method, fault analysis method, traveling wave method and high frequency transient method. ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 邵文权南树功
Owner XI'AN POLYTECHNIC UNIVERSITY
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