Distribution network fault distance measurement method based on fault transient state traveling wave zero-mode and aerial-mode speed difference

A transient traveling wave, fault location technology, applied in the fault location and other directions, can solve the problems of poor timeliness, low accuracy, and small scope of application, and achieve the effect of high accuracy, good timeliness, and large scope of application

Inactive Publication Date: 2014-06-25
STATE GRID CORP OF CHINA +1
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[0006] In the process of realizing the present invention, the inventor found that there are at

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  • Distribution network fault distance measurement method based on fault transient state traveling wave zero-mode and aerial-mode speed difference
  • Distribution network fault distance measurement method based on fault transient state traveling wave zero-mode and aerial-mode speed difference
  • Distribution network fault distance measurement method based on fault transient state traveling wave zero-mode and aerial-mode speed difference

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[0033] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0034] According to the embodiment of the present invention, such as figure 1 , figure 2 with image 3 As shown, a distribution network fault location method based on the zero-mode and linear-mode speed difference of the fault transient traveling wave is provided, that is, it provides a simple operation, can adapt to the characteristics of complex distribution network structure and more branches, and has certain anti-interference A single-ended traveling wave fault location method capable of meeting the positioning accuracy requirements. The distribution network fault location method based on the speed difference between the zero mode and the line mode of the fault transient...

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Abstract

The invention discloses a distribution network fault distance measurement method based on a fault transient state traveling wave zero-mode and aerial-mode speed difference. The method mainly includes the steps that the arrival moment t1 of an aerial-mode wave head and the arrival moment t0 of a zero-mode wave head are marked respectively, and the difference delta t of the time used for a zero-mode traveling wave to arrive at a measurement end and the time used for an aerial-mode traveling wave to arrive at the measurement end is obtained in a calculated mode; a typical fault distance is set to be Sk in a simulation or on-site test, the moment t0k at which the zero-mode wave head arrives at a measurement point is recorded, the speed v0k of the zero-mode traveling wave corresponding to the fault distance Sk is obtained, and a set of data related to the corresponding relationship between fault distances S and zero-mode detection wave speeds are obtained; by means of an obtained analytical expression, an iterative formula of the fault distance is obtained, and the corresponding fault distance is solved. According to the distribution network fault distance measurement method based on the fault transient state traveling wave zero-mode and aerial-mode speed difference, the defects that the application range is small, timeliness is poor and accuracy is low in the prior art can be overcome, and the method has the advantages of being large in application range, good in timeliness and high in accuracy.

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Owner STATE GRID CORP OF CHINA
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