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Quantitative evaluation method for internal insulation aging degree of oil-immersed power transformer

A technology for power transformers and aging degree, which is applied in the direction of measuring electrical variables, testing dielectric strength, instruments, etc. It can solve the problems of non-destructive quantitative evaluation of polymerization degree, and inability to conduct on-site transformer oil-paper insulation aging status.

Active Publication Date: 2019-07-12
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The invention provides a quantitative evaluation method for the internal insulation aging degree of an oil-immersed power transformer, which solves the engineering technical problem that the prior art cannot carry out non-destructive quantitative evaluation of the oil-paper insulation aging state and polymerization degree of the transformer on site

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  • Quantitative evaluation method for internal insulation aging degree of oil-immersed power transformer
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  • Quantitative evaluation method for internal insulation aging degree of oil-immersed power transformer

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Embodiment Construction

[0054] In order to further describe the application in detail, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0055] Under laboratory conditions, the method for quantitatively evaluating the internal insulation aging state and polymerization degree of the oil-immersed power transformer of this embodiment includes the following steps:

[0056] Step 1: Obtain the basic data curve of the frequency domain dielectric characteristics of the moisture-free oil-immersed paperboard, specifically:

[0057] 1.1. Use ordinary insulating paperboard and 45# naphthenic transformer mineral insulating oil to make oil-immersed paperboard samples. For pure new moisture-free oil-immersed paperboard, keep the test temperature at 30℃, 50℃ and 70℃ in a thermostat. At different temperatures, use a dielectric response diagnostic analyzer to conduct frequency-domain dielectric response tests to obtain frequency-domain dielec...

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Abstract

The invention discloses a quantitative evaluation method for the internal insulation aging degree of an oil-immersed power transformer, and belongs to the field of oil-paper insulation aging state evaluation. A frequency domain dielectric characteristic basic data curve of an oil-immersed paperboard without moisture and dielectric loss factor basic data curves of the oil-immersed paperboard with different aging degrees are obtained, and the water content, the polymerization degree and the conductivity of the oil-paper are quantitatively evaluated in different frequency bands based on the frequency domain dielectric response curve; accurate assessment of the insulation state of the aged transformer oil paper through the frequency domain dielectric response test of the transformer oil paperinsulation is realized, the time of on-site transformer insulation aging assessment can be effectively reduced, and the method has important significance for assessment of the insulation aging state and the polymerization degree of the oil paper insulation equipment on site.

Description

Technical field [0001] A method for evaluating insulation aging of voltage transformers in a shop belongs to the field of evaluating the aging state of oil-paper insulation, and particularly relates to a method for quantitatively evaluating the degree of internal insulation aging of oil-immersed power transformers. Background technique [0002] The reliable operation of oil-immersed power transformers is very important to ensure the stability of the power grid. During the operation, the transformers are subject to the combined aging of electric-thermal-mechanical factors for a long time, and the internal oil-paper insulation continues to age, which seriously threatens the safe operation of the transformer. [0003] For traditional power transformers, in order to accurately assess the internal insulation aging state and polymerization degree of the transformer, and to maintain or replace the transformer in time, chemical analysis methods are often used, such as taking a paper sample ...

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Application Information

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IPC IPC(8): G06Q10/06G06Q10/00G06F17/11G01R31/12
CPCG06Q10/06395G06Q10/20G06F17/11G01R31/1263Y04S10/50
Inventor 刘骥张明泽贾海峰程炜超聂洪岩朱博魏新劳
Owner HARBIN UNIV OF SCI & TECH
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