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Low-voltage line fault positioning method and system based on wavelet transformation

A technology of fault location and wavelet transformation, which is applied to fault locations, information technology support systems, and fault detection according to conductor types, etc., can solve the problems of reduced positioning accuracy and positioning errors, and achieve stable operation, improve fault location accuracy, and improve Effect of Line Fault Location Accuracy

Pending Publication Date: 2022-03-01
YUNNAN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fault analysis method is a positioning method that solves the voltage balance equation by detecting electrical quantities. In principle, the influence of transition resistance can be eliminated, but it is easy to cause positioning errors in data synchronization and uneven line transposition.
The traveling wave method has high positioning accuracy and simple calculation principle, and is not affected by line parameters, fault resistance and fault type, but it is easy to reduce the positioning accuracy in detecting the time when the fault traveling wave arrives at the detection point and the uncertainty of the traveling wave velocity

Method used

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  • Low-voltage line fault positioning method and system based on wavelet transformation
  • Low-voltage line fault positioning method and system based on wavelet transformation
  • Low-voltage line fault positioning method and system based on wavelet transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A low-voltage line fault location method based on wavelet transform, comprising the following steps:

[0051] S1: Collect the phase currents of A, B, and C phases when the line fails, and obtain the phase current fault component I A , I B , I C ;

[0052] S2: Perform phase-to-mode transformation on the fault component of the phase current to obtain the phase current I A , I B , I C The mode fault component traveling wave signal of ;

[0053] S3: Use db4 wavelet to conduct wavelet analysis on the α-mode fault component to obtain the maximum value of the mode;

[0054] S4: According to the obtained modulus maximum value, determine the modulus maximum point, which is the moment when the traveling wave head reaches the M terminal and N terminal, and then use the traveling wave ranging method to locate the fault.

Embodiment 2

[0056] A low-voltage line fault location method based on wavelet transform, comprising the following steps:

[0057] S1: Collect the phase currents of A, B, and C phases when the line fails, and obtain the phase current fault component I A , I B , I C ;

[0058] S2: Perform phase-to-mode transformation on the fault component of the phase current to obtain the phase current I A , I B , I C The mode fault component traveling wave signal of ;

[0059] S3: Use db4 wavelet to conduct wavelet analysis on the α-mode fault component to obtain the maximum value of the mode;

[0060] S4: According to the obtained modulus maximum value, determine the modulus maximum point, which is the moment when the traveling wave head reaches the M terminal and N terminal, and then use the traveling wave ranging method to locate the fault.

[0061] The specific method of the step S2 is:

[0062] Phase current fault component I A , I B , I C Perform Clarke phase-mode transformation decouplin...

Embodiment 3

[0081] like image 3 As shown, the low-voltage line fault location system based on wavelet transform includes:

[0082] The phase current collection module 101 is used to collect the phase currents of the A, B, and C three-phase phases when a fault occurs in the line, and obtain the phase current fault component I A , I B , I c ;

[0083] The first processing module 102 is used to perform phase-to-mode transformation on the fault component of the phase current to obtain the phase current I A , I B , I C The mode fault component traveling wave signal of ;

[0084] The second processing module 103 is used to use the db4 wavelet to perform wavelet analysis on the α-mode fault component to obtain the maximum value of the mode;

[0085] The fault location module 104 is used to determine the modulus maximum point according to the obtained modulus maximum value, which is the moment when the traveling wave head reaches the M terminal and the N terminal, and then uses the travel...

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Abstract

The invention relates to a low-voltage line fault positioning method and system based on wavelet transform, and belongs to the technical field of fault positioning. The method comprises the following steps: collecting phase currents of A, B and C phases when a line has a fault; performing phase-mode transformation on a phase current fault component to obtain a mode fault component traveling wave signal of the phase current; s3, performing wavelet analysis on the modulus fault component by using a db4 wavelet to obtain a modulus maximum value; and S4, according to the obtained modulus maxima, a modulus maxima point is determined, the point is the moment when the traveling wave head arrives at the M end and the N end, and then fault location is carried out by adopting a traveling wave distance measurement method. By introducing methods such as Clarke phase-mode transformation, wavelet analysis and traveling wave distance measurement, the influence of factors such as transition resistance, traveling wave velocity and line parameters on the line fault positioning precision is eliminated, the line fault positioning precision is effectively improved, the fault positioning error is reduced to be within 1%, stable operation of a power grid is guaranteed, and the method is easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of fault location, and in particular relates to a low-voltage line fault location method and system based on wavelet transform. Background technique [0002] The low-voltage distribution network is an important part of the power system. Whether the low-voltage distribution network can operate safely will have a direct impact on the life, work and production of users. It is the key to ensure the safe and orderly operation of the low-voltage distribution network to find out the faults in the low-voltage distribution network in time and carry out fault location and maintenance. [0003] At present, the location of faults in the low-voltage distribution network is mainly through manual investigation. This method requires electric power maintenance personnel to spend a lot of time going back and forth between various stations, and often cannot locate the fault in time, which directly affects the production and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 余恒洁林聪何兆磊朱梦梦王景孙黎敏
Owner YUNNAN POWER GRID
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