复合羊角间隙与避雷器并联的变压器中性点保护  

Transformer Neutral Protection Method of Composite Horn Gap Parallel to Surge Arrester

作　　者：杨鑫[1] 戴何笠 石海鹏 杨江涛[1] 王俏[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南省长沙市410004 [2]国网内蒙古东部电力有限公司电力科学研究院,内蒙古自治区呼和浩特市010000

出　　处：《电网技术》2016年第2期620-625,共6页Power System Technology

基　　金：国家自然科学基金面上项目(51277063);青年基金项目资助(51407013)~~

摘　　要：避雷器与放电间隙相并联的方法常用来保护变压器中性点绝缘,但由于间隙放电电压分散性较大,常导致间隙和避雷器无法按预期正常配合。提出使用复合羊角间隙与避雷器并联来保护变压器中性点绝缘,该装置既能保证在雷电过电压下放电稳定,同时在发生工频放电时避免了间隙电极被烧损,提高了间隙放电的稳定性。继而提出了运用基于Weibull概率分布的方法,来确定复合羊角间隙的距离。通过实例对110k V变压器中性点保护装置运用Weibull概率分布的方法,来确定复合羊角间隙的距离。根据实验验证结果,证明了基于Weibull概率分布的间隙距离确定方法是准确、可靠的。Parallel connection of surge arrester and discharge gap is often used in transformer neutral protection. Because of large dispersion of gap discharge voltage, the gap and the surge arrester cannot work as expected.In this paper, composite horn gap parallel to arrester protecting transformer neutral insulation is proposed. The device can guarantee discharge stability under lightning overvoltage. At the same time electrode gap burning lose can be avoided at power frequency breakdown, thus improving gap discharge stability. Then a new method is proposed based on Weibull probability distribution for determining composite horn gap distance. In a study example, the method uses Weibull distribution of 110 k V transformer neutral protection device to set gap distance of composite horn. Test results proves that this gap distance determination method is accurate and reliable.

关 键 词：变压器中性点 复合羊角间隙 氧化锌避雷器 绝缘配合 WEIBULL分布 

分 类 号：TM86[电气工程—高电压与绝缘技术]