摘要
以某高海拔地区500 k V地线绝缘化线路为例,分析其结构特征、绝缘化前后保护角的变化情况;通过直流试验、雷电冲击试验,并且考虑了海拔修正条件,验证了绝缘化地线并联间隙的绝缘配合性能;最后,利用ATP_EMTP软件仿真了在雷击情况下,地线绝缘化线路的耐雷性能变化情况以及不同间隙长度对防雷性能的影响效果。结果表明,在地线绝缘化线路中,在满足可靠绝缘、直流融冰的前提下,间隙长度对防雷性能的影响很小。
A 500 k V transmission line of ground insulation wire is taken as an example, its structure characteristics and the change of insulation protection angle before and after insulation are analyzed;According to DC test, lightning impulse test, considering the altitude correction conditions, the insulation coordination performance of shunt gap for insulated ground wire is verified; finally, the influence of the length of shunt gap on lightning protection characteristics and the change of lightning withstand performance of the ground wire insulation line under lightning strike are simulated by using the simulation software ATP-EMTP. The results show that the length of shunt gap has little influence on lightning protection on the premise of safe insulation and DC de-icing.
出处
《电瓷避雷器》
CAS
北大核心
2016年第3期42-47,共6页
Insulators and Surge Arresters
基金
国家电网公司科技项目"交直流架空输电线路雷击闪络限制技术完善研究"
关键词
地线绝缘化
并联间隙
绝缘配合
耐雷水平
ground wire insulation
shunt gap
insulation coordination
lightning withstand level
