[1]尹桂来,陈 田,姜海燕,等.液体硅橡胶的吸水特性及其对电气性能的影响[J].电瓷避雷器,2020,(03):219-224.[doi:10.16188/j.isa.1003-8337.2020.03.034]
 YIN Guilai,CHEN Tian,JIANG Haiyan,et al.Moisture Diffusion Property and Moisture-Induced Electrical Performances of Liquid Silicone Rubber[J].,2020,(03):219-224.[doi:10.16188/j.isa.1003-8337.2020.03.034]
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液体硅橡胶的吸水特性及其对电气性能的影响()
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《电瓷避雷器》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2020年03期
页码:
219-224
栏目:
绝缘子
出版日期:
2020-06-25

文章信息/Info

Title:
Moisture Diffusion Property and Moisture-Induced Electrical Performances of Liquid Silicone Rubber
作者:
尹桂来1 陈 田1 姜海燕2 于钦学2 陶贺香2 晏年平1
(1.国网江西省电力有限公司电力科学研究院,南昌 330096; 2.西安交通大学,西安 710049)
Author(s):
YIN Guilai1 CHEN Tian1 JIANG Haiyan2 YU Qinxue2 TAO Hexiang2 YAN Nianping1
(1.State Grid Jiangxi Electric Power Research Institute, Nanchang 330096, China; 2.Xi'an Jiaotong University, Xi'an 710049, China)
关键词:
液体硅橡胶 电缆附件 扩散模型 温度依赖性 电学性能
Keywords:
liquid silicon rubber(LSR) cable accessories diffusion model temperature dependence electrical properties
DOI:
10.16188/j.isa.1003-8337.2020.03.034
摘要:
液体硅橡胶作为电缆附件的组成材料,其密封受潮是电缆发生故障的重要原因之一,因此研究其吸水特性及其对电气性能的影响意义重大。研究了水分子在液体硅橡胶中的扩散模型,温度对水分子扩散过程的影响以及吸水对液体硅橡胶电学性能的影响。结果表明,水分子在液体硅橡胶中扩散过程符合Langmuir扩散模型,而不符合经典的Fick扩散模型,即水分子以 “自由态”和“结合态”两种状态存在于在液体硅橡胶中; 温度会同时影响水分子扩散进液体硅橡胶和液体硅橡胶中小分子硅氧烷和填料溶解两个过程,所以液体硅橡胶饱和吸水率随温度升高先增大再减小; 水的长时间扩散会导致液体硅橡胶损耗角正切增大,电导率增大,工频交流击穿场强降低, 相对介电常数增大。
Abstract:
Liquid silicon rubber(LSR)is a vital component of cable accessories and its dampness is one of the most important reasons for cable faults. Therefore, the study on moisture diffusion property and moisture-induced electrical performances of liquid silicone rubber is of great significance. In this paper, the diffusion model of water molecules in LSR and the influence of temperature on the diffusion process of water molecules were studied; and the effect of water absorption on the electrical properties of liquid silicone rubber was investigated. The results indicate that the diffusion process conforms to Langmuir diffusion model, rather than the classical Fick diffusion model, which means that water exists in LSR in “free” state and “bound” state. Besides, the temperature affects the diffusion process of water molecule and the dissolution process of low-molecular-weight siloxane and filler particles in some extent, for which the saturated water absorption rate increases first and then decreases with increasing temperature. In addition,the water absorbed by LSR will lead to the decrease the volume resistivity and AC breakdown strength of LSR, and the dielectric constant and loss tangent of LSR will increase.

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备注/Memo

备注/Memo:
收稿日期:2018-08-13 作者简介:尹桂来(1983—), 男,高级工程师,博士,主要研究方向电力电缆故障诊断分析技术。 基金项目:电力电缆运行状态诊断研究(编号:52182016001M)。
更新日期/Last Update: 2020-07-07