Small current grounding fault line selection method based on transient traveling wave

A small current grounding, transient traveling wave technology, applied in the fault location, detecting faults according to the conductor type, etc., can solve the problem of low reliability, and achieve the effect of wide application, easy implementation and simple principle.

Inactive Publication Date: 2016-05-04
SHANDONG UNIV OF TECH +1
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Problems solved by technology

[0006] Aiming at the line selection problem of small current grounding faults in distribution network, the present invention proposes a small current grounding fault line selectio

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  • Small current grounding fault line selection method based on transient traveling wave
  • Small current grounding fault line selection method based on transient traveling wave
  • Small current grounding fault line selection method based on transient traveling wave

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[0031] In order to clearly illustrate the technical features of the solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted from the present invention to avoid unneces...

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Abstract

The present invention discloses a small current grounding fault line selection method based on a transient traveling wave. The method comprises a step of using a working frequency zero-sequence voltage signal to determine the grounding fault of a system, a step of selecting a fault phase for any outlet in a same bus, a step of calculating the polarity relationship between a transient traveling wave current signal and a transient traveling wave voltage signal for any outlet in the same bus, and a step of determining the outlets in the same bus is a failed line or not according to the polarity relationship. According to the method, through comparing the dyadic wavelet transform maximum value of each outlet three-phase transient traveling wave current, the largest phase of each outlet transient traveling wave current is selected, then a fault line is selected according to the polarity relationship between the transient traveling wave current and transient traveling wave voltage, the principle is simple, the range of application is wide, the method is not influenced by the factors of the magnitude of transition resistance, a neutral point grounding mode, and the existence of a branch line and has a high engineering practical value.

Description

technical field [0001] The invention relates to a fault line selection method, in particular to a small current ground fault line selection method based on transient traveling waves, and belongs to the technical field of protection and control of distribution networks. Background technique [0002] The neutral point ineffective grounding method is widely used in my country's distribution network. This grounding method has the advantages of high power supply reliability, and its single-phase grounding fault has the highest incidence rate. When a single-phase ground fault occurs, the voltage of the non-faulted phase rises to the original times, in some cases, the grounding capacitor current may cause the arc to fly over the fault point, and an overvoltage 4-5 times larger than the phase voltage appears instantaneously, resulting in insulation breakdown, which further expands into a two-point or multi-point grounding short circuit; the arc at the fault point It can also cause...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 陈平张维锡曾强周正何耀梁凤强马庆玉
Owner SHANDONG UNIV OF TECH
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