Method for evaluating insulation state of electrical equipment

A technology for electrical equipment and insulation state, which is applied in the field of electrical equipment insulation state assessment based on matrix beam algorithm, and can solve problems such as damage, low accuracy and low efficiency.

Active Publication Date: 2019-03-22
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the methods for diagnosing the insulation state of electrical equipment are not mature enough, and most insulation state diagnosis methods have shortcomings such as low efficiency, low accuracy, and damage.

Method used

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  • Method for evaluating insulation state of electrical equipment
  • Method for evaluating insulation state of electrical equipment
  • Method for evaluating insulation state of electrical equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Such as figure 1 As shown, a method for evaluating the insulation state of electrical equipment, the steps are as follows:

[0070] S1. The polarization and depolarization currents of electrical equipment are measured according to time-domain dielectric spectroscopy;

[0071] S2, constructing a Hankel matrix with the depolarization current as a parameter;

[0072] S3, performing singular value decomposition on the Hankel matrix, judging the signal subspace and the noise subspace according to the magnitude of the singular value in the singular value curve, and determining the number of relaxation branches and relaxation parameters of the extended Debye model;

[0073] S4. Construct an extended Debye model of electrical equipment insulation by using the determined relaxation branch, and calculate insulation state parameters such as dielectric loss based on this model.

[0074] During implementation, the polarization and depolarization current test method using time-doma...

Embodiment 2

[0104] A device for evaluating the insulation state of electrical equipment, comprising

[0105] The depolarization current collection unit is used to collect the depolarization current of the electrical equipment under test;

[0106] The Hankel matrix construction unit constructs the Hankel matrix Y according to the depolarization current as a parameter;

[0107] The parameter calculation unit is used to perform singular value decomposition on the Hankel matrix Y, determine the effective signal subspace and noise subspace according to the size of the singular value, filter out the noise subspace, and determine the number of relaxation branches p of the extended Debye model according to the effective signal subspace , the coefficient A of the exponential component of each branch i and attenuation coefficient τ i ;

[0108] The Debye model construction unit is used to determine the number of relaxation branches p and the coefficient A of each branch index component according...

Embodiment 3

[0110] A device for evaluating the insulation state of electrical equipment, including a processor, a memory, and one or more modules, the one or more modules are stored in the memory and configured to be executed by the one or more processors , the one or more modules include instructions for executing each step in the method described in Embodiment 1.

[0111] Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

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Abstract

The invention discloses a method for evaluating the insulation state of electrical equipment. A matrix beam algorithm is utilized to identify equivalent circuit parameters of an expanded Debye model of the electrical equipment according to polarization and depolarization current for time-domain dielectric response of the electrical equipment, and then insulation state parameters such as a dielectric loss are calculated to evaluate the insulation state of the electrical equipment. The method comprises the following steps of firstly, measuring the polarization and depolarization current of the electrical equipment and then constructing a Hankel matrix by using the depolarization current as parameters; secondly, carrying out singular value decomposition on the Hankel matrix and judging a signal subspace and a noise subspace according to a singular value in a singular value curve in order to determine the number of relaxation branches and relaxation parameters of the expanded Dubai model;finally, using the determined relaxation branches for constructing the insulation-expanded Debye model of the electrical equipment and calculating the insulation state parameters such as the dielectric loss according to the model. Therefore, an accurate and reliable diagnosis method is provided for evaluating the insulation state of the electrical equipment.

Description

technical field [0001] The invention relates to a method for evaluating the insulation state of electrical equipment, in particular to a method for evaluating the insulation state of electrical equipment based on a matrix beam algorithm. Background technique [0002] With the rapid development of my country's social economy, my country's power infrastructure has also been rapidly developed. The increase in consumption has made the capacity of the power grid continue to expand, and the operating voltage level has gradually increased. The safe and reliable operation of the power system has become an important task for the power industry. Bring huge impact, affect people's daily life. [0003] In recent years, accidents of power grid transmission system outage due to electrical equipment failures have occurred frequently. Electrical equipment tends to deteriorate with the increase of the age of its insulation. From the analysis of the causes of various accidents, the failure...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 张晨萌王鑫谢施君张榆曹树屏刘凡姜南希
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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