Simple evaluation method for thermal ageing condition of oil paper insulation
A technology for oil-paper insulation and thermal aging, which is applied in the direction of instruments, dielectric strength testing, and measuring devices, and can solve the problems of less attention paid to changes in the composition of insulating paper and the inability to reliably reflect insulation conditions, etc.
Active Publication Date: 2018-11-27
CHONGQING UNIV
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Problems solved by technology
However, due to the influence of various factors such as oil filtering in the middle of the transformer, the test results of oil chemical parameters cannot reliably reflect the insulation condition
The degree of polymerization of insulating paper can truly reflect the aging degree of oil-paper insulation. The change of its degree of polymerization is mainly due to the deterioration of fiber paper caused by the change of its chemical composition and microstructure during the aging process of oil-paper insulation. Less attention has been paid to changes in the composition of insulating paper itself
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0024] join Figure 1-5 , first find out the variation law of hydrogen-oxygen bond, carbon-hydrogen bond, carbon-oxygen bond and surface potential attenuation characteristics with aging conditions through experiments, including the following steps:
[0025] 1) After the insulating oil and insulating paper are dried and oil-immersed, the accelerated thermal aging test is carried out without temperature and time. Specifically, the completely dry insulating oil and insulating paper are fully impregnated according to the mass ratio of (10-20): 1, and then placed in a vacuum aging box. The time is 7-60 days.
[0026] The insulating oil in this example uses Karamay 25# transformer oil...
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The invention discloses a simple evaluation method for the thermal ageing condition of oil paper insulation. The simple evaluation method includes the following steps: 1) measuring the Fourier infrared spectrum of insulating paper; 2) measuring the surface potential attenuation characteristics of the insulating paper; 3) according to measurement results of the steps 1) and 2), evaluating the thermal ageing condition of the oil paper insulation. The simple evaluation method has the advantages that chemical compositions and the potential attenuation property of the insulating paper are tested after thermal ageing of the oil paper insulation, chemical bond breakage and formation as well as the charge accumulation characteristics of the insulating paper in the ageing process are analyzed, andthe ageing condition of an oil paper insulation system is reflected indirectly. The simple evaluation method is applicable to rough evaluation of the thermal ageing condition of the oil paper insulation in large-scale power transformers, test methods and devices applied are simple to implement, and high practicability is realized.
Description
technical field [0001] The invention belongs to the technical field of evaluating the aging state of oil-paper insulation, in particular to a simple evaluation method for the thermal aging state of oil-paper insulation. Background technique [0002] The power transformer is the core of energy conversion and transmission in the power grid, and its oil-paper insulation performance has a major impact on the normal operation of the transformer. The oil-paper insulation system of transformers in long-term operation will age due to the influence of temperature, electric field and moisture, among which thermal aging is the main aging form. The evaluation of the aging state of the oil-paper insulation system is of great significance to the safe operation of the power grid. [0003] At present, the internationally recognized methods for diagnosing the aging state of oil-paper insulation mainly include dissolved gas analysis, furfural content test in oil and polymerization degree tes...
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IPC IPC(8): G01R31/12G01N21/3563G01N27/00
CPCG01N21/3563G01N27/00G01R31/1263
Inventor 王飞鹏万春香李剑黄正勇王有元陈伟根杜林周湶文刚赵琦杨力
Owner CHONGQING UNIV