Compact Design of 550 kV Basin-Type Spacer in Gas Insulated Switchgear (Part I) —— Structure Optimization
Wang Chao1, Li Wendong1, Chen Tairan2, Li Wenqiang3, Gong Ruilei3, Zhang Guanjun1
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China; 2. Tai’an Power Supply Company State Grid Shandong Electric Power Company Tai’an 271000 China; 3. Shandong Taikai High Voltage Switchgear Co. Ltd Tai’an 271000 China
Abstract：In the context of guaranteeing good electrical strength of gas insulated metal enclosed switchgear (GIS), to reduce the consumption of SF6 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 SF6 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.
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2022, Vol. 37 
