机-热协同作用下绝缘纸机械性能的劣化机理

doi:10.19595/j.cnki.1000-6753.tces.171607

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Abstract The iron core of converter transformer vibrates severely with the effect of DC bias, which affects the mechanical properties degradation of its insulation paper. Based on the purposely designed mechanical-thermal ageing oven, a series of accelerated ageing experiments were carried out at temperature 130℃, frequency 10 Hz and the amplitude 0 mm, 1.99 mm and 2.64 mm respectively. The tensile strength (TS) and degree of polymerization (DP) of the specimen were measured, and the microscopic structures of the specimen before and after ageing were compared with the X-ray diffraction (XRD) analysis method and scanning electron microscopy (SEM) photos. Connected with test data, the relations between the vibration amplitude and the percentage TS loss and percent DP loss are researched. It indicates that there exists both chemical reaction of free radical chain and physical reactions including fibre drawing and internal force attenuation in the cellulose degradation process, which makes the reaction rate is much quickly than that of pure thermal ageing experiments. With XRD and SEM analysis, it can be found that the mechanical-thermal synergy does not change the microcrystal type of the cellulose, while the relative crystallinity and grain size of the cellulose fiber become smaller. Meanwhile, mechanical vibration accelerates degradation in two ways, the refinement, bifurcation and breakage of fiber and appearance, increase and development of holes, which promotes the deterioration of the insulation paper mechanical properties. The study provides a reference for the research of deterioration mechanism of converter transformer insulation paper under the complex effect of mechanical-thermal-electrical and for the exploration of the accordingly suppression methods.

Key words： Converter transformer mechanical-thermal synergy percentage of tensile strength loss reaction rate microscopic structure

Received: 22 November 2017 Published: 12 November 2018

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TM855

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	Li Changyun
	Wang Zheng

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Li Changyun,Wang Zheng. The Degradation Mechanism of Insulation Paper Mechanical Properties with Mechanical-Thermal Synergy[J]. Transactions of China Electrotechnical Society, 2018, 33(21): 5090-5097.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.171607 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I21/5090

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