1000kV特高压避雷器抗弯性能试验与仿真研究

Experimental and Simulation Study on Flexural Performance of 1000 kV UHV Arrester

针对1 000 kV特高压整柱避雷器进行了抗弯耐受试验和破坏试验,分析了设备在受弯过程中的应力、应变及弹性模量等力学性能参数变化规律,对试验过程中设备受拉侧和受压侧应变产生区别的原因和影响因素进行了剖析,验证了特高压避雷器整柱设备耐受荷载的能力;同时,通过破坏试验,得到了整柱避雷器设备的破坏模式和破坏应力,提出了在进行动态或静态力学试验时设备应力的估算依据和方法;通过数值仿真与试验结果的对比,验证了仿真模型参数取值的合理性,提出了仿真模型中材料弹性模量取值原则和范围;理论计算和试验及仿真的对比分析表明,一端固定的电气设备在自由端荷载作用下的变形与悬臂梁结构存在本质区别,实际位移计算时不能将其简化为悬臂梁结构;本研究得到的相关数据可为电气设备的结构设计改进、变电站回路系统的抗震设计和力学性能评估提供依据。

The variation of mechanical properties such as the stress.strain and elastic modulus were analyzed through bending tolerance test and destruction test against 1000kV UHV arrester. The reason that tensile strain and compressive strain was different during the test was given and the tolerance load of the UHV arrester was verified. Meanwhile, through destruction test, the failure mode and failure stress of the whole UHV arrester were obtained and estimation method of equipment stress in mechanical tests was proposed. After comparing the test results with the simulation results, the correctness of the simulation model was also verified, and the scope and principles of the elastic modulus value of simulation model was proposed. The comparing results of theoretical arithmetic.test and simulation showed that the deformation under the free end of the load between electrical equipment Fixed at one end was different from an over hand beam, so the electrical equipment could not predigest an over hand beam. Data obtained in this paper could provide the basis for electrical equipment structure design and seismic design as well as mechanical properties evaluation of substation loop system.