高压断路器液压操动机构油缸缓冲过程仿真与试验

Cushion Process of the Hydraulic Cylinder of Hydraulic Operating Mechanism for High Voltage Circuit Breaker

对550 kV超高压断路器液压操动机构中高速油缸的台阶型内缓冲结构进行仿真分析与试验研究,提出了通过判别雷诺数来选择缓冲过程中节流损失方程的建模方法,结合CFD流场分析对其缓冲节流过程进行了分阶段建模。仿真分析了油缸缓冲过程的压力、速度、位移等动态特性,并与试验测试结果进行了对比。结果表明,仿真分析结果与试验测试结果吻合较好,证明了建模方法的有效性与仿真模型的准确性,揭示了高速油缸缓冲过程的运动机理,指出了现有缓冲结构峰值压力和末速度过高的原因,可指导台阶型内缓冲结构的优化。

Cushion structure of high-speed cylinder of the 550kV high voltage circuit breakers was analyzed.The flow characteristics of the cushion structure were estimated by Reynolds number and a simulation model was built with the results of CFD analysis.Pressure,velocity and displacement characteristics of the cylinder were simulated.The simulation results and the test results were compared.It indicated that the simulation method was effective and the simulation model was accurate.Dynamic characteristics of the cushion process of high speed hydraulic cylinder were revealed,and reasons for high peak pressure and high end-velocity were pointed out.The proposed method could help the optimization of cushion structure.