机械应力对油浸绝缘纸板局部放电影响

doi:10.19595/j.cnki.1000-6753.tces.191720

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摘要变压器中油纸绝缘材料在运行时承担着热、电、机等应力并在其作用下不断老化,然而关于机械应力下油纸绝缘材料的老化尚未引起足够重视。为研究机械应力下油纸绝缘材料性能演变规律,该文对油浸绝缘纸板进行不同机械应力下的老化实验,并对老化后的绝缘纸板进行力学性能测试、局部放电实验以及表面形态观测。研究结果表明,力学性能对绝缘纸板性能的影响以20MPa为界分为两部分。当机械应力低于20MPa时,纸板的弹性模量及剩余形变均较小,随着机械应力的升高,纸板绝缘性能有所提升;当机械应力高于20MPa时,纸板的弹性模量及剩余形变显著增大,随着机械应力的升高,纸板绝缘性能快速下降,纸板电极下局部放电模式也发生了变化。共聚焦显微镜观测结果表明,当机械应力高于20MPa后,绝缘纸板中的纤维由弹性变形转为塑性变形,纤维出现分岔、空洞及断裂,导致纸板的绝缘性能降低。该文研究结果为变压器中油纸绝缘材料在机械应力作用下老化规律的研究提供了基础,并有效地提升了判别变压器内部绝缘状态的能力。

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	崔彦捷
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	李熙宁

关键词 ：油浸绝缘纸板, 机械应力, 弹性模量, 局部放电, 表面形态观测

Abstract：Oil-paper insulation materials in transformer bear thermal, electrical and mechanical stresses during operation and continues to age under these stresses. Nevertheless, the aging of the oil-paper insulation material under mechanical stress has not received enough attention. In order to study the evolution of oil-paper insulation materials under mechanical stress, the aging test of oil-impregnated insulation paper under different mechanical stresses was carried out. Then, the mechanical performance test, partial discharge test and surface morphology observation on the aged insulation cardboard were carried out. The results show that the influence of mechanical properties on the performance of insulating paperboard is divided into two parts with 20MPa as the boundary. When the mechanical stress is lower than 20MPa, the elastic modulus and residual deformation of the paperboard are small, and the insulation performance of the paperboard is improved with the increase of the mechanical stress. When the mechanical stress is higher than 20MPa, the elastic modulus and residual deformation of the paperboard increase remarkably. With the increase of the mechanical stress, the insulation performance of the paperboard decreases rapidly, and the partial discharge mode under the plate electrode also changes. The results of confocal-microscopy show that when the mechanical stress is higher than 20MPa, the fibers in the insulating paperboard change from elastic deformation to plastic deformation, and the fibers appear tiller, void and fracture, resulting in the decrease of the insulation performance of the paperboard.

Key words： Oil-immersed pressboard mechanical stress elastic modulus partial discharge surface morphology observation

收稿日期: 2019-12-08

PACS:

TM211

基金资助:国家自然科学基金-智能电网联合基金重大集成资助项目（U1866603）

通讯作者: 汲胜昌, 男,1976年生,教授,博士生导师,研究方向为电力设备在线监测。E-mail: jsc@xjtu.edu.cn

作者简介: 崔彦捷,男,1991年生,博士研究生,研究方向为变压器内部局部放电、油纸绝缘老化。E-mail:542824948@qq.com

引用本文:

崔彦捷, 汲胜昌, 祝令瑜, 刘志华, 李熙宁. 机械应力对油浸绝缘纸板局部放电影响[J]. 电工技术学报, 2021, 36(12): 2659-2666. Cui Yanjie, Ji Shengchang, Zhu Lingyu, Liu Zhihua, Li Xining. Effect of Mechanical Stress on Partial Discharge of Oil-Impregnated Pressboard. Transactions of China Electrotechnical Society, 2021, 36(12): 2659-2666.

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