摘要
潮湿污秽等微环境极易引发高压开关柜放电或绝缘击穿故障。为提高开关柜设计及运行水平,本研究对高压开关柜微环境下的内部电场分布特性及绝缘净距离进行仿真计算研究。首先基于COMSOL仿真软件建立40.5 kV高压开关柜母线室多物理场有限元仿真模型,获得开关柜母线室中温度、湿度分布。利用数值分析方法研究有无微环境下的电场分布特性,基于空气流注放电起始判据,利用COMSOL与MATLAB软件计算微环境下的绝缘净距离。最后研究微环境下不同绝缘隔板布置参数(厚度和位置)对电场分布和绝缘净距离的影响。结果表明:在高温高湿的环境下,母线室最高温度可达347.15 K,整体温度呈现上高下低的梯度分布;绝缘隔板处于低温高湿度区域,容易积聚湿污;微环境下母排尖端电场和绝缘净距离降低,但绝缘隔板表面电场增大,沿面闪络概率增大。
In humid and dirty environment, it is easy for high voltage switchgear to trigger discharge or insulation breakdown fault. To improve the design and operation level of high voltage switchgear, we simulated the electric filed distribution of high voltage switchgear under micro-environment and calculated the minimum discharge distance. Firstly, a multi-physical field finite element simulation model of bus chamber for 40.5 kV high voltage switchgear was established by COMSOL simulation software, and the temperature and humidity distribution in the bus chamber were obtained. The electric field distribution characteristics in the presence or absence of microenvironment were studied by numerical analysis method. Based on the air streamer discharge initiation criterion,the minimum discharge distance in micro-environment was calculated by COMSOL and MATLAB software.Finally, the influence of different insulation partition layout parameters(thickness, location) on the electric field distribution and minimum discharge distance in micro-environment was studied. The results show that the maximum temperature in the bus bar chamber can reach 347.15 K under high temperature and high humidity environment, and the overall temperature presents a gradient distribution of upper and lower. The insulating partition, which is located in the area of low temperature and high humidity, is easy to accumulate wet dirt. In the micro-environment, the electric field at the bus tip and the minimum discharge distance decrease, but the surface electric field increases, and the flashover probability increases.
作者
陈荣
曹梦
田涛
邢向上
宋晓博
何金
CHEN Rong;CAO Meng;TIAN Tao;XING Xiangshang;SONG Xiaobo;HE Jin(Electric Power Research Institute,State Grid Tianjin Electric Power Company,Tianjin 300384,China;Ninghe Power Supply Branch,State Grid Tianjin Electric Power Company,Tianjin 301500,China)
出处
《绝缘材料》
CAS
北大核心
2021年第8期83-88,共6页
Insulating Materials
基金
国网天津市电力公司科技项目(KJ20-1-40)。
关键词
高压开关柜
微环境
绝缘隔板
电场分布
绝缘净距离
HV switchgear
micro-environment
insulation partition
electric field distribution
discharge distance
