表面生长苔藓对500kV交流输电线路玻璃绝缘子的影响  

Effect of Surface Moss on Glass Insulator of 500 kV AC Transmission Line

作　　者：宋磊[1] 张福增 罗凌[1] 梁曦东[1] 廖一帆 

机构地区：[1]清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点试验室,北京100084 [2]南方电网科学研究院有限责任公司,广州510080

出　　处：《高电压技术》2014年第4期1038-1044,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011CB209406);特高压工程技术(昆明;广州)国家工程试验室开放基金(NEL201202)~~

摘　　要：为研究表面生长苔藓的玻璃绝缘子的电气特性和机械特性,以21片500 kV表面生长苔藓的玻璃绝缘子作为试品进行了研究。测量了21片试品的污秽度和绝缘电阻,并进行污闪试验和拉力试验。在此基础上,对苔藓易生长的位置、生长原因和处理方法进行了讨论。结果表明,当玻璃绝缘子耐张串悬挂时,苔藓在绝缘子上表面的分布远不如在下表面的分布密集,且其在下表面主要分布于上侧棱外沿和下侧棱内沿。表面生长苔藓的玻璃绝缘子的单片污闪电压为42.5 kV,其电气特性和机械特性仍然满足线路运行要求。然而,由于玻璃绝缘子生长苔藓部位的盐密(ESDD)和灰密(NSDD)明显大于未生长苔藓部位,随着时间的推移,苔藓部位的盐密和灰密进一步增大,会对绝缘子的安全运行造成隐患,因此需要重点关注并定期进行清扫。In order to investigate the electrical characteristic and mechanical characteristic of moss-covered glass insulator, we experimentally studied 21 units of 500 kV glass insulators in the presence of moss on their surface. We carried out mechanical test and pollution test measured on these glass insulators after measuring their pollution grade and resistance value. In the meantime, we also discussed the cause, position, and treatment of the moss growth. The results show that, the moss is less intensive on the insulators＇ upper surface than on the lower surface, where the moss mainly grows on the upper side of outer edge and the lower side of inner edge. Each single insulating strip of the glass insulators has the pollu- tion flashover voltage about 42.5 kV, while their electrical characteristics and mechanical characteristics still meet the operational requirements of transmission lines. However, since the areas with moss growth have obviously higher equiva- lent salt deposit density （ESDD） and non-soluble deposit density（NSDD） than other areas on the insulators, and the ESDD and NSDD will escalate with the passage of time, the operation of insulators will eventually get jeopardized. Hence we should pay attention to the moss growth and clean glass insulators regularly.

关 键 词：玻璃绝缘子 苔藓 污秽闪络 机械特性 绝缘电阻 自爆 

分 类 号：TM216[一般工业技术—材料科学与工程]