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Method for removing single-terminal traveling wave fault location dead area of high-voltage power grid in coal mine

A high-voltage power grid, single-ended traveling wave technology, applied in the fault location, using the pulse reflection method to detect faults, electrical components and other directions, can solve the problems of difficulty in distinguishing fault traveling wave characteristics, insufficient judgment of dead zone, etc., to improve adaptability, The effect of enhancing the degree of resolution

Active Publication Date: 2013-09-11
CHINA UNIV OF MINING & TECH
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for eliminating the dead zone of single-ended traveling wave fault location in coal mine high-voltage power grid, and to solve the problem that the existing single-ended traveling wave fault location is difficult to distinguish due to fault traveling wave characteristics, and if the fault location matches the basic characteristics of the line , there is a problem of insufficient judgment of the dead zone

Method used

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  • Method for removing single-terminal traveling wave fault location dead area of high-voltage power grid in coal mine
  • Method for removing single-terminal traveling wave fault location dead area of high-voltage power grid in coal mine
  • Method for removing single-terminal traveling wave fault location dead area of high-voltage power grid in coal mine

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Embodiment 1

[0027] Embodiment 1: The method compares the calculated value and the measured value of the known structure of the topology parameters of the line, eliminates the wave head reflected by the non-faulty line, and finds the reflected wave head of the busbar at the opposite end of the faulty line and the reflected wave head of the fault point, that is, the special wave head ; Further classify and calculate the special wave head, eliminate the positioning dead zone, and realize accurate fault positioning;

[0028] 1. Define the instantaneous power of traveling wave:

[0029] The characteristic frequency band of traveling wave is f=10~100kHz, that is, in the above frequency band, the energy of traveling wave is the largest. Before the traveling wave signal is introduced into the data acquisition device through CT or PT, the signal needs to be band-pass filtered to suppress the very high frequency signal in the power system and avoid the superposition of the traveling wave signal on ...

Embodiment 2

[0045] Embodiment 2: The present invention has high positioning accuracy and high adaptability in complex distribution networks, and the present invention can satisfy systems of different scales or changes in system scale. Now take a model as an example:

[0046] exist figure 2 Among them, Frequency Dependent (Phase) Model is used for overhead lines and cables, which can better reflect the transient state and harmonic characteristics of the line. Among them, the 10kV network has 6 outgoing lines, 3 overhead lines, 2 cable lines, and 1 cable mixed line (the bold line is the cable). The parameters of the overhead line are: zero sequence impedance 0.3E-03+j0.1E-02Ω / m, positive sequence impedance 0.3E-04+j0.4E-03Ω / m; zero sequence admittance is 0.1E-10+j0. 2E-08S / m, the positive sequence admittance is 0.1E-10+j0.3E-08S / m. The parameters of the cable are: the zero sequence impedance is 0.2E-03+j0.2E-02Ω / m, the positive sequence impedance is 0.3E-04+j0.2E-03Ω / m; the zero sequenc...

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Abstract

The invention provides a method for removing a single-terminal traveling wave fault location dead area of a high-voltage power grid in a coal mine, and belongs to a method for single-terminal traveling wave fault location of the high-voltage power grid in the coal mine. A traveling wave instant power is defined; a fault feature wave tip is identified by means of a method that special wave tips are mutually verified, and a location dead area problem is solved; a calculation value of a circuit topological parameter known structure is compared with a measurement value, wave tips reflected by non-fault circuits are removed, and a reflection wave tip of a bus at the opposite end of a fault circuit and fault point reflection wave tips, namely the special wave tips are searched; by means of further classification calculation of the special wave tips, the function of removing the location dead area is achieved, meanwhile fault precise location is achieved, and the location errors are within 100 meters by means of large quantities of simulation and on-site data tests. The method has the advantages that the distinguishing degree of the traveling wave tips is improved under high noise in the practical power grid; in the power grid of the coal mine, by means of the method that the two special wave tips with faults are mutually verified, the problems that in circuits with mixed cables, the wave velocity is not consistent, and the wave tips are difficult to identify are solved.

Description

technical field [0001] The invention relates to a method for locating a single-end traveling wave fault of a coal mine high-voltage power grid, in particular to a method for eliminating a dead zone for locating a single-end traveling wave fault of a coal mine high-voltage power grid. Background technique: [0002] Most of the high-voltage power grids for coal mine power supply in my country are single-ended radial power grids, and the common voltage levels are mostly 10kV or 6kV single-bus or double-bus power supply. According to statistics, more than 80% of coal mine power grids are single-phase ground faults. [0003] At present, there are mainly two methods of distance measurement based on fault transient traveling wave analysis: single-ended method and double-ended method. The single-ended method calculates the fault based on the time difference between the traveling wave head arriving at the detection end and the refracted wave head arriving at the detection end again. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/11
CPCG01R31/11H02H7/265
Inventor 梁睿王崇林崔连华周希伦刘建华高列庞乐乐
Owner CHINA UNIV OF MINING & TECH
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