1100 kV特高压油气套管主绝缘及其金具附件结构校核计算  

Main Inner Insulation of 1 100 kV UHVAC Oil-gas Bushing and Structure Optimization Design of Its Fittings

作　　者：张施令 胡伟[2] 彭宗仁[2] ZHANG Shiling;HU Wei;PENG Zongren(State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute,Chongqing 401123,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网重庆市电力公司电力科学研究院,重庆401123 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高电压技术》2021年第6期2062-2072,共11页High Voltage Engineering

摘　　要：针对1 100 kV交流特高压电压等级油–气套管的研制尚属首次,需解决套管主绝缘芯体材料研制、芯体主绝缘设计及优化、套管大电流导体载流结构设计等关键技术。该研究侧重于1 100 kV特高压油–气套管主绝缘结构优化设计分析计算,确保在高电压作用下电场分布合理,且承载大电流而不存在局部过热区域。基于此,建立了特高压油–气套管三维有限元工装配件仿真计算模型,优化设计了套管芯体主绝缘结构使其轴向场强约为0.715 kV/mm,径向场强最大值为4.25 kV/mm,均能满足控制要求。合理设计了套管中心载流结构及两端部均压装置的拓扑结构,且中心载流导体涡流损耗修正系数为1.822。依据优化设计结构研制了油–气套管样机及配套工装结构,顺利通过各项型式试验。该结构设计兼顾变压器出线结构与高压组合电器GIS电气连接配套工装的加工安装,模拟特高压油–气套管全电压、全电流实验布置环境且可对其进行长时性能评估试验,具有良好的工程应用指导价值。At present,it is the first time to develop and manufacture oil-gas bushings for 1 100 kV AC extra high voltage level is. It is necessary to solve the problems in the material development of main insulation core of bushing, in the design and optimization of main insulation of core, and in the design of the current carrying capacity of large current conductor of bushing structural design and other key technologies. This paper focuses on the analysis and calculation of the optimization design of main insulation structure of 1 100 kV UHV oil-gas bushing to ensure that the electric field distribution is reasonable under the action of high voltage, and that it carries large current without local overheating areas. Based on this, a three-dimensional finite element simulation model of tool and assembly for UHV oil-gas bushing is established, and the main insulation structure of bushing core is optimized, so that the axial field strength is about 0.715 k V/mm and the maximum radial field strength is 4.25 kV/mm, which can meet the control requirements. The current carrying structure in the center of the bushing and the topological structure of the voltage sharing device at both ends are designed reasonably, and the correction coefficient of the eddy current loss of the current carrying conductor in the center is 1.822. The prototype and supporting tooling structure of the oil-gas casing are developed according to the optimized design structure, and are verified in various bushing type tests. In this paper, the main insulation structure of UHV oil-gas bushing is designed to compromise and simulate the actual operation environment of the UHV oil-gas bushing with full voltage and full current, and the long-term performance evaluation test is verified, which has good engineering application guidance value.

关 键 词：油–气套管 有限元 高压组合电器 配套工装 结构参数优化 

分 类 号：TM216.5[一般工业技术—材料科学与工程]