Oil paper insulation thermal aging life assessment method based on time temperature water superposition method

A superimposition method and technology of oil-paper insulation, applied in instruments, measuring devices, measuring electricity, etc., can solve the problems of accelerating the aging of transformer paper insulation

Inactive Publication Date: 2015-03-11
STATE GRID CORP OF CHINA +3
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Problems solved by technology

However, studies at home and abroad have shown that moisture has a great impact on the aging rate and life of transformers. Both moisture and oxygen in paper insulation cellulose will accelerate the aging of transformer paper insulation, and the moisture content is proportional to the aging rate.

Method used

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  • Oil paper insulation thermal aging life assessment method based on time temperature water superposition method
  • Oil paper insulation thermal aging life assessment method based on time temperature water superposition method
  • Oil paper insulation thermal aging life assessment method based on time temperature water superposition method

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Embodiment Construction

[0046] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] Such as figure 1 As shown, the method comprises the following steps: 1) after the insulating paper is pretreated, select and control test samples with different initial moisture contents to carry out accelerated thermal aging test, and measure the degree of polymerization value after sampling according to a certain time interval during the aging process; 2 ) follow the assumptions of the time-temperature superposition method and the kinetic equation of the cumulative loss of cellulose polymerization degree, draw the performance parameter change curves at different temperatures, and obtain the main curve and temperature translation factor α T , to obtain the activation energy of the Arrhenius equation and establish an extrapolated life model at any thermal aging temperature; 3) follow the method of time-temperature superposition, draw...

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Abstract

The invention discloses an oil paper insulation thermal aging life assessment method based on a time temperature water superposition method, and belongs to the technical field of transformer oil paper insulation thermal aging life assessment. When extrapolation is performed on high temperature accelerated aging data by the method, influence of water content and the collaborative acceleration effect of water and temperature are fully considered, and the accelerated aging data under high temperature high initial water content are extrapolated to data under the operation condition of low temperature low water content so that defects in a conventional time temperature superposition model are overcome, and thus the more accuracy and comprehensive life assessment method aiming at transformer oil paper insulation thermal aging is provided.

Description

technical field [0001] The invention belongs to the technical field of thermal aging life evaluation of transformer oil-paper insulation, and relates to a method for evaluating the thermal aging life of oil-paper insulation based on a time-temperature-water superposition method. Background technique [0002] Due to differences in operating load and ambient temperature, the remaining life of transformers that have been in operation for more than 20 years in my country varies greatly. Some transformers are still in good insulation condition and have the ability to continue to serve, while some transformers are in poor insulation condition and need to be repaired or replaced in time. . In order to avoid economic losses caused by blind maintenance to power companies and provide technical support for transformer condition maintenance, it is necessary to use modern technical means to evaluate the remaining life of transformers in service, so as to ensure the maximum extension of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 杨丽君廖瑞金李金忠王季宇张镱议汪可黄加佳程焕超赵学童
Owner STATE GRID CORP OF CHINA
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