550k V GIS盆式绝缘子小型化设计(一)——几何形状优化

Compact Design of 550 kV Basin-Type Spacer in Gas Insulated Switchgear(Part Ⅰ)——Structure Optimization

在保证气体绝缘开关设备(GIS)绝缘强度的基础上,为减少SF_(6)气体使用量、缩小设备体积,基于有限元仿真及数值优化方法开展了针对工程实际中的550kV盆式绝缘子小型化设计研究。在中心导杆与密封罐体之间距离缩小10%的条件下,通过对盆体凸面、凹面轮廓以及两端厚度的形状优化,可使得沿面电场分布更加均匀,盆体中心导体侧及低压法兰处的机械应力集中现象得到大幅缓解。相较于原始结构,经几何形状优化后的盆式绝缘子显著提升了的电气性能和力学性能。优化后的小型化绝缘子凹面沿面最大电场强度及最大形变量可分别降低25.4%和29.9%,并可减少盆式绝缘子6.1%的环氧复合材料使用量以及GIS密封罐体内约15%的SF_(6)气体使用量。该文提出的GIS小型化改造方案兼顾了电气和力学性能,具有较高的制造可行性和应用前景,能够为紧凑型、环境友好型GIS设备的研制提供参考。

In the context of guaranteeing good electrical strength of gas insulated metal enclosed switchgear(GIS),to reduce the consumption of SF_(6) gas and downsize equipment’s volume,compact design of a 550 kV basin-type spacer used in real projects was conducted based on the finite element method and numerical optimization method.In the condition of reducing 10%insulation distance between central conductor and sealed tank,by optimizing basin-type spacer’s profile and thickness at two terminal regions,surface electric field of spacer is well-distributed and local concentrated mechanical stresses at the central conductor or sealed tank are much relieved.Comparing with original insulation system,structure of spacer obtained by structure optimization exhibits significantly improved electrical and mechanical properties.The maximum electric field along the concave and the maximum deformation of spacer could decrease by 25.4%and 29.9%,respectively.Moreover,optimized structure after compact design shows approximately a 15%decrease of SF_(6) usage and a 6.1%reduction of epoxy composite weight.We believe that the proposed performance improvement strategy for GIS insulation system taking both electrical and mechanical properties into account,thus exhibits good manufacturing feasibility and application potential,which can provide reference for the development of compact and eco-friendly GIS equipment.