摘要
复合绝缘子具有优异憎水性和憎水迁移性,有效遏制了电网污闪事故的发生,被广泛用于高压输电线路。复合绝缘子中小分子硅氧烷对其憎水性能具有重要影响,为此利用气相色谱–质谱联用技术（GC-MS）对新出厂和运行复合绝缘子伞裙中小分子种类和含量进行研究。GC-MS测试结果表明：伞裙中的小分子主要为低聚环硅氧烷Dn（n为聚合度）,新出厂和运行复合绝缘子均存在D3—D21小分子。相比于新出厂复合绝缘子,运行复合绝缘子小分子总含量明显偏少;从小分子种类来说,运行复合绝缘子D10及以下小分子含量显著减少,表明D10及以下小分子在憎水迁移性中起主要作用。测试结果发现运行复合绝缘子伞裙中小分子硅氧烷浓度受其位置影响,高压端和中间段伞裙小分子硅氧烷浓度明显小于低压端伞裙。
Silicone rubber composite insulators are replacing conventional porcelain or glass insulators and widely employed in high voltage power grids. Small molecule siloxanes in silicone rubber are thought to play an important role in the hydrophobic recovery for the composite insulators. We used gas chromatography-mass spectroscopy（GC-MS） to study the kinds and contents of small molecule weight siloxanes in the composite insulator sheds. For the running composite insulators, the silicone rubber sheds close to the low-potential side,high-potential side and middle part were chosen. The virgin samples were bought from the same supplied company. GC-MS results show that all small molecule siloxanes are the small cyclic siloxanes Dn（n is the degree of polymerization）. Compared with the virgin composite insulator, the amount of small molecule siloxanes in the running one decreases sharply, while the amount of Dn in the sheds close to the high voltage end and middle part is much less than that in the shed close to the grounded end.
作者
黄振
彭向阳
汪政
陈龙
方鹏飞
HUANG Zhen;PENG Xiangyang;WANG Zheng;CHEN Long;FANG Pengfei(Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China;College of Physics and Technology,Wuhan University,Wuhan 430072,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第9期2822-2827,共6页
High Voltage Engineering
基金
南方电网公司科技项目(K-GD2014-185)
国家自然科学基金(21174108)~~
关键词
复合绝缘子
硅橡胶伞裙
气相色谱–质谱联用
小分子硅氧烷
憎水性能
composite insulator
silicone rubber shed
GC-MS technology
low molecular weight siloxane
hydrophobic property
