电热老化对干式变压器中环氧树脂特性的影响

doi:10.19595/j.cnki.1000-6753.tces.170942

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摘要为了研究电热老化对干式变压器中环氧树脂的影响规律,将环氧树脂样品进行电热老化试验,定期测试老化样品的质量损失率、交流击穿电压、介电特性以及红外光谱。结果表明,随着电热老化时间的增加,样品质量减少,击穿电压减小,介质损耗增加。相比电、热单因素作用,电热联合老化对材料的质量损失率、击穿场强及介电特性影响更显著,且大于电、热的叠加作用。通过德拜方程拟合介电常数虚部,发现增加电热老化的温度或电场,电导、极化损耗都增加。通过红外光谱可以看出,电老化没有使材料内部产生新的基团。热老化后环氧树脂内部羟基被氧化,碳氢键发生断裂,说明热老化机理明显不同于电老化。电热联合作用也使得更多的羟基被氧化,更多的碳氢键断裂。电、热相互增强老化效果,具有协同效应。

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	王有元
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关键词 ：环氧树脂, 电热老化, 协同效应, 德拜方程

Abstract：In order to study the influence of electrothermal aging on the epoxy resin in dry-type transformers, the epoxy resin samples were subjected to electrothermal aging test. The mass loss rates, ac breakdown voltages, dielectric properties, and infrared spectrum of the aged samples were tested periodically. The results show that with the increase of electrothermal aging time, the mass and breakdown voltage decrease, while the dielectric loss increases. Compared with electrical/ thermal single factor effect, the effects of electrothermal aging on weight loss rate, dielectric loss and breakdown voltage change are greater. Using the Debye equation to fit the dielectric constant imaginary part, it is found that increasing the temperature or electric field of the electrothermal aging leads to the rise of electrical conductivity and polarization loss. Via infrared spectroscopy, it is observed that there are no new groups produced in samples after electrical aging. After thermal aging, hydroxyls are oxidized and hydrocarbon bonds are decomposed inside epoxy resin, which indicates the mechanism of thermal aging is significantly different from that of electrical aging. In addition, more hydroxyls are oxidized and hydrocarbon bonds are decomposed after electrothermal aging. The electricity and heat mutually reinforce aging effect and have a synergistic effect.

Key words： Epoxy resin electrothermal aging synergistic effect Debye equation

收稿日期: 2017-07-01 出版日期: 2018-09-03

PACS:

TM215.1

基金资助:国家自然科学基金资助项目（51637004）

通讯作者: 刘玉女,1993年生,硕士研究生,研究方向为电力设备绝缘特性研究。E-mail: 20151102030t@cqu.edu.cn

作者简介: 王有元男,1971年生,博士,教授,研究方向为电力设备绝缘在线监测及故障诊断技术研究。E-mail: y.wang@cqu.edu.cn

引用本文:

王有元, 刘玉, 王施又, 徐海鹰. 电热老化对干式变压器中环氧树脂特性的影响[J]. 电工技术学报, 2018, 33(16): 3906-3916. Wang Youyuan, Liu Yu, Wang Shiyou, Xu Haiying. The Effect of Electrothermal Aging on the Properties of Epoxy Resin in Dry-Type Transformer. Transactions of China Electrotechnical Society, 2018, 33(16): 3906-3916.

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