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A method for diagnosing the state of oil-paper insulation based on the mixed characteristic quantities of recovery voltage and depolarization current

A technology of recovering voltage and mixed characteristics, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of staying in qualitative analysis, the accuracy of qualitative analysis results is difficult to guarantee, and the diagnosis and analysis of a single transformer cannot be achieved. The effect of quantitative assessment

Active Publication Date: 2021-07-27
FUZHOU UNIV
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Problems solved by technology

But so far, most researchers have only stayed in qualitative analysis when applying dielectric characteristic parameter analysis to evaluate the state of oil-paper insulation, and cannot make a powerful diagnostic analysis for a single transformer. Two or more power transformers need to be actually tested. Diagnosis results can only be obtained by comparative analysis of data
This aging assessment method not only requires a cumbersome detection process, but also the accuracy of qualitative analysis results is difficult to guarantee

Method used

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  • A method for diagnosing the state of oil-paper insulation based on the mixed characteristic quantities of recovery voltage and depolarization current
  • A method for diagnosing the state of oil-paper insulation based on the mixed characteristic quantities of recovery voltage and depolarization current
  • A method for diagnosing the state of oil-paper insulation based on the mixed characteristic quantities of recovery voltage and depolarization current

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with embodiment.

[0056] First, the transformer insulation state is divided into N j (j=1,2,...,m), according to the already known insulation status and insulation classification of t transformers, establish the classic domain and node domain of various insulation state levels of transformers, and the classic domain and node domain It can be used to characterize the state level of the transformer, calculate the correlation degree of the transformer to be diagnosed with each state level of the transformer through the correlation function, and make a one-to-one reference correlation between the transformer to be diagnosed and each state level of the established transformer, so as to determine the state of the transformer grade.

[0057] Specifically, this embodiment provides a method for diagnosing the state of oil-paper insulation with mixed characteristic quantities of recovery voltage and depolariza...

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Abstract

The invention relates to a method for diagnosing the state of oil-paper insulation based on mixed characteristic quantities of recovery voltage and depolarization current. Based on the time-domain dielectric spectrum data obtained from on-site testing of multiple oil-paper insulating transformers, the method is established based on different characteristic quantities that can reflect the insulation state. Matter-element model of the transformer; using the extension analysis method to determine the weight coefficients of the indicators of each layer of the transformer; then, based on a large number of measured data and the results of calculation and analysis, the classical domain and node domain of the four insulation states of the transformer are determined; finally, The correlation function values ​​of the four insulation states of the transformer to be diagnosed are determined through the correlation function, so as to determine the insulation level of the transformer to be diagnosed. The invention can more effectively realize the quantitative diagnosis of the oil-paper insulation state, deeply study the insulation aging and the like.

Description

technical field [0001] The invention relates to the research field of oil-paper insulation aging diagnosis, in particular to a method for diagnosing the state of oil-paper insulation based on mixed characteristic quantities of recovery voltage and depolarization current. Background technique [0002] At present, in the research field of oil-paper insulation aging diagnosis, there has been some research on the analysis of oil-paper insulation state by means of dielectric response characteristic parameters. Now it has got the attention of experts and has been widely used. However, so far, most researchers have only stayed in qualitative analysis when applying dielectric characteristic parameter analysis to evaluate the state of oil-paper insulation, and cannot make a powerful diagnostic analysis for a single transformer. Two or more power transformers need to be actually tested. Diagnosis results can only be obtained by comparing and analyzing the data. This aging assessment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06F17/16G06F17/18G01R31/12
CPCG01R31/1263G06F17/16G06F17/18G06Q10/0639
Inventor 宋福根陈俊鸿傅泽坤
Owner FUZHOU UNIV
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