一种考虑复合材料降解的复合绝缘子伞裙护套中水分扩散的改进朗缪尔模型

A Modified Langmuir Model for Moisture Diffusion in UGFRE of Composite Insulator Considering the Composite Degradation.

作者信息

Yuan Zhikang, Wang Cheng, Jin Lijun, Tu Youping, Zhang Yingyao, An Zhenlian, Zhao Yongfei

机构信息

Department of Electrical Engineering, College of Electronic and Information Engineering, Tongji University, Shanghai 201804, China.

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China.

出版信息

Polymers (Basel). 2022 Jul 19;14(14):2922. doi: 10.3390/polym14142922.

DOI:10.3390/polym14142922

PMID:35890697

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9324177/

Abstract

Water invasion induced aging and degradation of the unidirectional glass fiber reinforced epoxy resin (UGFRE) rod is inferred as the primary reason for the decay-like fracture of the composite insulator. In this paper, the moisture diffusion processes in the UGFRE from different directions at various test humidities and temperatures are studied. The moisture diffusion of the UGFRE sample obeys the Langmuir diffusion law under the humidity conditions of 53%, 82% and 100% at 40 °C. In deionized water, the moisture diffusion of the UGFRE sample also obeys the Langmuir diffusion law when the invading direction is vertical to the glass fiber. However, when the water invades the UGFRE sample, parallel with the glass fiber, the weight loss caused by composite degradation should not be neglected. A modified Langmuir model, taking Arrhenius Theory and the nonlinear aging characteristic of the composite into consideration, is proposed and can successfully describe the moisture diffusion process. Both the glass fibers and epoxy resin will degrade in the deionized water. The glass fibers show better resistance to degradation than the epoxy resin. The epoxy resin degrades from the glass fiber/epoxy resin interface and become fragments. For composite insulators, the water invasion through the ends should be avoided as far as possible, or the degradation of the UGFRE rod will result in decay-like fracture.

摘要

水分侵入导致单向玻璃纤维增强环氧树脂（UGFRE）棒材老化和降解，被推断为复合绝缘子出现类似腐烂断裂的主要原因。本文研究了在不同测试湿度和温度下，UGFRE中不同方向的水分扩散过程。在40℃、湿度为53%、82%和100%的条件下，UGFRE样品的水分扩散遵循朗缪尔扩散定律。在去离子水中，当侵入方向垂直于玻璃纤维时，UGFRE样品的水分扩散也遵循朗缪尔扩散定律。然而，当水平行于玻璃纤维侵入UGFRE样品时，复合材料降解引起的重量损失不可忽视。提出了一种考虑阿伦尼乌斯理论和复合材料非线性老化特性的修正朗缪尔模型，该模型能够成功描述水分扩散过程。玻璃纤维和环氧树脂在去离子水中都会降解。玻璃纤维比环氧树脂表现出更好的抗降解性能。环氧树脂从玻璃纤维/环氧树脂界面开始降解并变成碎片。对于复合绝缘子，应尽可能避免水分从端部侵入，否则UGFRE棒材的降解将导致类似腐烂的断裂。