550kV隔离开关的电场仿真分析

Electric Field Simulation Analysis of 550kV Isolation Switch

为研究气体隔离开关内部电场分布情况,建立了550kV混合气体隔离开关的二维轴对称有限元模型,利用ANSYS APDL软件对其灭弧室内部进行电场仿真计算分析,得到了在额定开距状态下两触头之间最大电势差时的电压与电场分布,并分别加载正向或反向电压观察其电场分布.仿真结果表明:无论动静触头加载正向或反向电压,动静触头间隙电压分布较均匀且按等势线趋势由高电压向低电压处扩散,且电场分布无较明显不同.动静触头之间电场分布均匀,有利于电弧的开断,静弧触头端点处电场强度较大且局部电场变化梯度大,易产生电击穿现象,在以后的设计中加以改善.

A two-dimensional axisymmetric finite element model of a 550kV mixed gas isolating switch was established in order to understand the electric field distribution inside the gas isolation switch.The electric field simulation calculation and analysis of the interior of the arc extinguishing chamber is carried out by using engineering design and analysis software ANSYS APDL.The voltage and electric field distributions of the maximum potential difference between the two contacts in the rated open distance state were obtained,and the electric field distribution was observed by loading the forward or reverse voltage respectively.The results show that regardless of whether the moving contact is loaded with forward or reverse voltage,the dynamic and static contact gap voltage distributions are relatively uniform and spreads from high voltage to low voltage according to the trend of the equipotential line,and the electric field distribution is not significantly different.The electric field distribution between the moving and static contacts is uniform,which is beneficial to the arc breaking.The electric field strength at the end of the static arc contact is large with great local electric field change gradient,which is easy to produce electric breakdown and it needs to be improved in later design.