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Ranging method for overhead line power distribution network single-phase earth fault

A single-phase ground fault, distance measurement technology, applied in the fault location, information technology support system and other directions, can solve the problem of large distance error of the fault point, and achieve the effect of small error and reduced error

Inactive Publication Date: 2015-09-02
SICHUAN UNIV
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  • Description
  • Claims
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Problems solved by technology

[0005] What the present invention aims to solve is the problem that the distance error of the fault point obtained by multiplying time and speed by three-phase injection is large

Method used

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  • Ranging method for overhead line power distribution network single-phase earth fault
  • Ranging method for overhead line power distribution network single-phase earth fault
  • Ranging method for overhead line power distribution network single-phase earth fault

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Embodiment Construction

[0029] As described in the background technology, during three-phase injection, when a traveling wave of a certain modulus reaches the fault point, it will not only be reflected, but also transmitted to other moduli. Let the characteristic impedance matrix of the uniform transmission line be Z c , the phase-mode transformation matrix is ​​diagonalized to obtain the mode impedance Z=diag[Z 0 Z 1 Z 2 ], where Z 0 is the 0-mode wave impedance, Z 1 is the 1-mode wave impedance, Z 2 is the 2-mode wave impedance. figure 1 It is a schematic diagram of the structure of a single-phase ground fault in the overhead line distribution network. Taking the ground fault of the A-phase transmission line in the three-phase transmission line as an example, R is the transition resistance after the ground fault occurs. The wave impedance of the rear end of the fault point is equivalent to the wave impedance of the parallel connection between the refraction end and the grounding end, so tha...

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Abstract

Provided is a ranging method for overhead line power distribution network single-phase earth faults. The method comprises: using an off line method to inject three-phase symmetric high-voltage pulse to an overhead line power distribution network on a bus end, and sampling zero-module voltage in a preset time window from zero time, to obtain a zero-module voltage waveform; performing energy normalizing processing on the zero-module voltage waveform to obtain an energy normalizing waveform; extracting fault point reflected wave arrival time, front time, front steepness, and wave front energy from the energy normalizing waveform; using the arrival time, front time, front steepness, and wave front energy as input variables of a neural network, and using fault distances as output of the neural network to establish a ranging model. The errors of fault distances obtained by the ranging method for overhead line power distribution network single-phase earth faults are low.

Description

technical field [0001] The invention relates to the technical field of fault location of an overhead line distribution network, in particular to a distance measuring method for a single-phase grounding fault in an overhead line distribution network. Background technique [0002] my country's overhead line distribution network generally operates in a small current grounding mode, and its structure is mostly a closed-loop design and a tree-shaped radial structure of open-loop operation. Due to the complex operating environment of the overhead line distribution network, the probability of single-phase ground fault is high, which affects the safe and reliable operation of the overhead line distribution network. After a single-phase ground fault occurs, the traditional processing method is to find the fault point through manual line inspection, which is time-consuming and laborious. It is of great significance to study the accurate and effective distance measurement method of si...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 舒勤任琴钟俊吴成恩
Owner SICHUAN UNIV
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