550kV GIL盆式绝缘子及其组件结构优化设计

Optimization Design on Insulating Spacer and Its Assembly Structure of 550 kV GIL

为均匀气体绝缘金属封闭输电线路(gas insulated metal enclosed tranmission line,GIL)内盆式绝缘子附近气体区域及绝缘子沿面的场强分布,提高GIL整体的工作性能及运行可靠性,采用非均匀有理B样条曲线拟合方法,重构盆式绝缘子结构形状,利用有限元分析方法,进行电场及应力场的仿真计算,利用智能优化算法对盆式绝缘子、高压屏蔽罩及中心连接件的形状进行了优化,优化后结构与初始结构相比,盆式绝缘子附近气体区域的电场最大值下降了13.6%,凸面切向电场最大值下降了10.3%,改善了GIL内部电场局部过大的问题;在盆式绝缘子凹、凸面分别加气压时,盆式绝缘子沿面及连接件接触面最大应力分别下降了7.4%、7.0%和14.9%、18.6%,提升了盆式绝缘子的机械性能。文中研究成果可为各种高压电器结构优化设计提供参考。

For homogeneous field strength distribution near the gas area and surface of insulating spacer of gas insulated metal-enclosed transmission lines(GIL)and also for improving both integral operation performance and reliability of GIL,the uneven rational B-spline curve fitting method is used to reconfigure structure shape of the insulating spacer.The calculation of electrical field and stress field is performed by the finite element analysis method.The shape of the insulating spacer,high voltage shield and the center connector is optimized by the use of intelligent optimization algorithm.With the shape being compared before and after the optimization,the maximum electric field near the gas area of the insulating spacer is decreases by 13.6%,and the maximum electric field in the tangential direction of the convex surface is decreased by 10.3%,which improves the problem of excessive partial electric field in the GIL.In case of applying gas pressure on both concave and convex surfaces of the insulating spacer,the maximum stress along the surface of the insulating spacer and the contact surface of the connectors is decreased by 7.4%,7.0%and 14.9%,18.6%respectively,which improves the mechanical properties of the insulating spacer.The study result in this paper can provide reference for the optimization design of structure of various high voltage apparatus.