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Lightning stroke fault identifying method with transient volume protection

A lightning strike fault and identification method technology, which is applied in the direction of protection against overvoltage, etc., can solve problems such as difficulty in distinguishing, small energy ratio of high-frequency components and low-frequency components of traveling wave signals, etc.

Inactive Publication Date: 2008-06-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when lightning strikes the conductor (shielding) on ​​the line and does not cause a fault, the energy ratio of the high-frequency component to the low-frequency component in the traveling wave signal may also be relatively small, which will be difficult to distinguish from the situation during the fault

Method used

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  • Lightning stroke fault identifying method with transient volume protection
  • Lightning stroke fault identifying method with transient volume protection
  • Lightning stroke fault identifying method with transient volume protection

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Embodiment Construction

[0039] The concrete steps of this method are as follows:

[0040] (1) When the transmission line fails or is struck by lightning, and a relatively large traveling wave is detected at the protection installation, the traveling wave protection or transient protection starts and records the traveling wave process with a time of 3ms;

[0041] (2) Through the modulus transformation matrix T = 1 1 1 1 - 1 0 0 1 - 1 - 1 0 1 ...

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Abstract

The method is according to the different feature between the waveform of the failure and non-failure to process the linear fitting of the failed traveling wave with a straight line, according to the error of fitting to define the coefficient of the waveform homogeneity, by reading the value of the coefficient of the waveform homogeneity to determine the traveling wave of the failure and non-failure.

Description

Technical field: [0001] The invention relates to a lightning strike fault identification method for transient quantity protection, which belongs to the technical field of electric power system relay protection. Background technique: [0002] For more than ten years, with the development of microelectronics technology, the protection principle based on the transient quantity caused by line faults has attracted the attention of electric power workers at home and abroad, which has set off a research climax on traveling wave protection and transient protection. Obtained gratifying research results (References 1-4). The biggest feature of these protection principles is that the rich high-frequency components contained in the transient signal generated by the fault can be used to quickly identify the fault and achieve the purpose of quickly removing the fault. But at the same time, traveling wave protection and transient protection will also face more high-frequency interference,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/22
Inventor 束洪春司大军刘志坚邱革非孙向飞唐岚
Owner KUNMING UNIV OF SCI & TECH
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