Method for evaluating service life of oil-paper insulation inside high-voltage current transformer

An oil-paper insulation, high-voltage current technology, used in instruments, measuring electricity, measuring electrical variables, etc.

Active Publication Date: 2018-11-23
JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There is no report on the life evaluation of insulating paperboard with different initial moisture content in the unaged state, so a new technical solution is urgently needed in the existing technology to solve this problem

Method used

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  • Method for evaluating service life of oil-paper insulation inside high-voltage current transformer
  • Method for evaluating service life of oil-paper insulation inside high-voltage current transformer
  • Method for evaluating service life of oil-paper insulation inside high-voltage current transformer

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Experimental program
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Effect test

Embodiment

[0121] The evaluation process of the oil-paper insulation life inside the high-voltage current transformer is as follows:

[0122] Under laboratory conditions, ordinary insulating cardboard and 45# naphthenic transformer mineral insulating oil were used to make oiled paper, and the cardboard was allowed to absorb moisture naturally, and subsequent tests were carried out at different moisture contents (0.17%, 1.2%, 2.7%, 3.2%) ;

[0123] Use the test instrument to test the frequency domain dielectric loss curves of the above-mentioned oil paper with different moisture content at temperatures of 40°C, 60°C, 80°C, and 100°C. The test curve of oil paper with a moisture content of 1.2% is now selected as figure 2 As shown; with 40°C as the translation reference temperature, the dielectric loss curves of 60°C, 80°C, and 100°C are respectively shifted and calculated to obtain the translation factor at the corresponding test temperature. According to the relationship between the tran...

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Abstract

The invention relates to a method for evaluating the service life of oil-paper insulation inside a high-voltage current transformer. The invention provides the effective numerical calculation method for evaluating the service life of the oil-paper insulation inside the high-voltage current transformer, and the method comprises the steps: carrying out the translation reduction through the oil-paperinsulation dielectric loss factor curves tested at different temperature values to obtain a temperature translation factor; obtaining a corresponding moisture content oil-immersed paper board activation energy according to the calculated temperature translation factor; repeatedly performing the calculation process of the oil-immersed paper board activation energy, and building the relation between the oil-immersed paper board activation energy and the moisture content; and accurately evaluating the aging state of the oil-paper insulation inside the high-voltage current transformer through combining a reaction kinetic model of cellulose aging in the oil-paper insulation. The method achieves the prediction of the service life of oil paper with different test temperatures and moisture contents.

Description

technical field [0001] The invention belongs to the field of life evaluation of oil-paper insulation, in particular to a method for evaluating the life of oil-paper insulation inside a high-voltage current transformer. Background technique [0002] The high-voltage current transformer is an important link in the operation of the power grid. However, due to the influence of the complex operating environment (moisture content, aging temperature, etc.), the oil-paper insulation inside the high-voltage current transformer will be severely aged, and its insulation performance will be greatly reduced. Seriously affect the stability of the power grid, so the service life of the high-voltage current transformer depends on the aging degree of the internal oil-paper insulation. It is of great significance to study the aging life evaluation algorithm of the internal insulation of the high-voltage current transformer. [0003] For oil-paper insulation equipment, the degree of reduction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R35/02
CPCG01R31/1263G01R35/02
Inventor 杨代勇于群英敖明赵春明林海丹张益云孙友群王朔刘赫列剑平矫立新刘俊博
Owner JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD
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