CT26型断路器操动机构动力学仿真及拐臂疲劳寿命分析Mechanical Simulation on Operating Mechanism and Fatigue Life Analysis on Crank Arm of CT26 Circuit Breaker
王增彬,张拓,姚聪伟,孙帅,王立军
WANG Zengbin,ZHANG Tuo,YAO Congwei,SUN Shuai,WANG Lijun
摘要(Abstract)：
机构缺陷是高压断路器运维过程中的常见问题之一,开展断路器操动机构机械特性研究对提高其运行可靠性有着重要意义。针对高压断路器CT26-252型弹簧操动机构分别建立多刚体动力学模型和刚柔混合动力学模型,对断路器操动机构在分合闸过程中的运动情况进行仿真研究,对比了2种模型的差异,并用实验数据验证了模型的准确性,最后计算得出机构拐臂的机械应力和应变分布,进行了疲劳寿命分析。结果表明:针对CT26-252型弹簧操动机构建立的动力学模型可以较准确地模拟断路器操动机构的实际运动情况,并且由于机构零件应变量小,多刚体动力学模型与刚柔混合动力学模型计算结果差异小,拐臂上下通孔载荷谱存在明显差异,拐臂疲劳寿命受限于其上下通孔,疲劳寿命可达6万次。
Operating mechanism defects are commonly seen in high-voltage circuit breaker maintenance.Therefore, the research on mechanical characteristics of circuit breaker is of significance to reliability improvement. A multi-rigid-body mechanical model and a rigid-flexible mechanical model are built following the CT26-252 spring operating mechanism to simulate the movement of the operating mechanism during opening and closing. The differences between the models are compared, and the precision of the models are verified by experimental data. Finally, mechanical stress and strain distribution of the crank arm are calculated for fatigue life analysis. The results show that the mechanical model for the CT26-252 spring operating mechanism can accurately simulate the actual operation of the operating mechanism of the circuit breaker, and due to the small strain of the mechanism parts, the calculation results of the multi-rigid-body mechanical model and the rigid-flexible model are the same; there are evident differences between load spectrums of upper and lower plating through holes that set a limit on the crank arm fatigue life of 60 thousand times.
关键词(KeyWords)：
断路器;弹簧机构;动力学仿真;疲劳寿命
circuit breaker;spring mechanism;mechanical simulation;fatigue life
基金项目(Foundation): 中国南方电网有限责任公司科技项目（GDKJXM20180154）
作者(Author):
王增彬,张拓,姚聪伟,孙帅,王立军
WANG Zengbin,ZHANG Tuo,YAO Congwei,SUN Shuai,WANG Lijun
DOI: 10.19585/j.zjdl.202105014
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