Abstract: The electrical analysis and mechanical analysis on structure of insulator for ITER magnetic systems are made by finite element method. The results show that the composite insulation breaks can withstand 56kV high voltage, 4MPa inner gas pressure, 2000N tensile force, 1000Nm bending moment and 100Nm torsion. The results of thermal stress analysis indicate that thermal stress is a key factor comparing with influence of outer mechanical leads.

Key words: ITER, Insulator, Thermal stress, Fiber Reinforced plastic (FRP) composite

摘要： 用有限元法对ITER装置磁体系统的高性能氦气密复合材料绝缘子的结构设计进行电场分析和力学性能分析。分析结果表明，绝缘子能够承受耐电压56kV、耐气压4MPa、耐拉力2000N、耐弯矩1000Nm、耐扭矩100Nm的技术参数要求；同时热应力分析结果表明，与外力作用的影响相比，热应力是影响绝缘子性能的关键因素；绝缘子在拉力、弯矩和扭矩受力下发生变形的是金属部分，外力对绝缘部分的影响不大。

关键词: ITER, 绝缘子, 热应力, 纤维增强环氧树脂(FRP)复合材料