包覆绝缘护套对220kV输电线路鸟粪闪络特性的影响  

Influence of Coating Insulation Sheath on Flashover Characteristics of 220kV Transmission Line

作　　者：张清文 ZHANG Qingwen(Yangjiang Power Supply Bureau of Guangdong Power Grid Co.,Yangjing 529500)

机构地区：[1]广东电网有限责任公司阳江供电局,阳江529500

出　　处：《计算机与数字工程》2020年第7期1804-1809,共6页Computer & Digital Engineering

摘　　要：鸟粪闪络是造成电网故障的重要原因之一,其发生频度一直居高不下。论文以220kV输电线路为研究对象,首先模拟了不同下落方式下鸟粪闪络过程,以及不同运行电压下鸟粪下落时间隙放电特性,对比了包覆绝缘护套前后放电特性差异,最后搭建了三维有限元仿真模型,对包覆护套前后以及不同鸟粪下落时刻进行了电场分析。研究表明,随着运行电压升高,鸟粪下落时间隙放电呈现逐渐增强趋势,当电压超过112kV时间隙发生闪络;包覆护套情况下,由于护套承担了35kV^50kV左右电压,使得高压端金具电位远低于实际运行电压,鸟粪下落时绝缘护套表面容易产生剧烈放电现象,而鸟粪端部与金具之间只能形成局部电弧因而无法发生闪络。Flashover is one of the important causes of power failures,witch occurrence remains very high.The paper takes the220 kV transmission line as the research object,firstly simulated flashover process of different dropping mode and gap discharge characteristics under different operating voltage when guano falls,then compared the difference of the discharge characteristics before and after coating insulation sheath.Finally,a three-dimensional finite element simulation model is built,in which electric field distribution before and after coating insulation sheath and in different time of bird droppings fall.Research shows that with the operating voltage increases,bird droppings fall time gap discharge showed a gradual increasing trend,and when voltage applied is more than 112 kV,there will occur flashover.Due to the fact that insulation sheath takes about 35~50 kV,the high-voltage end fitting potential is much lower than the actual operating voltage,as a result,the sheath surface is prone to violent discharge phenomenon when bird streamer drops,while local arc discharge instead of flashover may happen in the air gap between bird streamer and fittings.

关 键 词：鸟粪闪络 绝缘护套 三维模型 有限元仿真 电场分布 

分 类 号：TM85[电气工程—高电压与绝缘技术]