Method for judging and positioning distributed traveling wave fault of power transmission line

A technique for traveling wave faults, transmission lines, applied to fault location, fault detection by conductor type, measurement of electricity, etc.

Inactive Publication Date: 2016-02-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to propose an improved distributed traveling wave fault judgment and location method based on the combination of dichotomous SVD theory and wavelet transform to solve the problems in the system at any time when a fault occurs. Reliable location of line faults

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  • Method for judging and positioning distributed traveling wave fault of power transmission line
  • Method for judging and positioning distributed traveling wave fault of power transmission line
  • Method for judging and positioning distributed traveling wave fault of power transmission line

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Embodiment Construction

[0041] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0042] like Figure 4 As shown, taking the ground fault of phase A as an example, the total length of the transmission line is 120km, and 4 sets of detection devices are installed on it, and each set of detection devices is separated by 30km. Faults occurred when the closing angle was 0° (the voltage crossed zero) and 10° (the voltage did not cross zero), and the sampling frequency was 1MHz.

[0043] Step 1: Detect and read the fault current information of 4 sets of detection devices.

[0044] Step 2: Use the T matrix to perform phase-mode transformation on the fault data.

[0045] Step 3: Select 2 1 The scaled wavelet performs zero-crossing detection on the fault data, and K is selected according to the line parameters w =0.07, K=0.05. The identification results of different fault points are shown in Table 1.

[0046] Step 4: Select the cubi...

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Abstract

The invention discloses a method for judging and positioning a distributed traveling wave fault of a power transmission line, and relates to the technical field of power transmission line fault positioning. The method comprises the following steps: S1, arranging n groups of detection devices on M and N buses of a transformer substation and on an overhead transmission line; S2, detecting and reading the current information of each group of detection devices; S3, carrying out the phase-mode conversion of a three-phase fault current traveling wave; S4, carrying out the zero-crossing recognition of the voltage of a fault point at a fault moment; S5, selecting a wavelet transformation algorithm or a bisection SVD algorithm according to the results of step S4; S6, determining a fault section and calculating the speed of the traveling wave and a fault distance according to the header information of the fault traveling wave. The method solves problems that the fault distance cannot be accurately determined under the condition that a fault happens nearby a voltage zero-crossing point when a system independently employs the wavelet transformation algorithm, the data processing efficiency is low and the operational amount is large when the system independently employs the bisection SVD algorithm.

Description

technical field [0001] The invention relates to the technical field of transmission line fault location. Background technique [0002] Electricity is the lifeblood of the national economy. Transmission lines shoulder the heavy responsibility of transmitting electric energy and are an important part of the power system. It is important to improve the safe and stable operation of the power system, reduce operation and maintenance costs, improve economic benefits, and provide users with high-quality electric energy. Basic tasks of electrical work. Due to the wide distribution of transmission lines, they are usually erected in unattended fields, passing through various terrains such as mountains, hills, and rivers. In addition, the climate environment is complex, and they will encounter meteorological conditions such as thunderstorms, icing, and strong winds. One of the electrical equipment that failed. Fast, reliable and accurate fault location, timely detection and treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 宋永端杨峰夏成龙李瑞张冬晴
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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