Abstract:

For the spring actuator of 12kV,12.5kA vacuum circuit breaker,a mathematical model calculating the breaking and closing velocity based on mechanism analysis was given.The design for spring actuator of vacuum circuit breaker based on robust optimization was presented.The lengths of the connecting rods and the stiffness coefficient of breaking and closing spring of the spring actuator were chosen as the optimization variables.The effect of the factors, as processing errors,assembly error,ageing and fatigue,was considered as the tolerance of design variables.The functions,which were used to minimize the error of the breaking and closing velocity of vacuum circuit breaker and to minimize the maximal variation of these velocity when the design variables varied within the acceptable tolerances,were chosen as the objective function.So a robust optimization mathematical model with multi-target and two-level optimization for the spring actuator was given.A series of optimization strategy were presented,and the algorithm was tested  by using a classical standard test function.The performance of 12kV,12.5kA vacuum circuit breaker is improved by robust optimization.The numerical example shows the effectiveness of the method.

Key words: spring actuator, robustness, optimization, stiffness coefficient, test function

摘要：

在分析10kV/12.5kA真空断路器弹簧操动机构基础上,建立了分合闸速度的计算模型。在此断路器的数学模型基础上，将稳健设计思想和优化设计思想相结合,将弹簧操动机构中各杆件的长度和分合闸弹簧的刚度系数作为设计变量,将加工误差、装配误差、老化、疲劳等因素引起的影响考虑在设计变量的容差
之中，以真空断路器的分合闸速度的方差最小化，且当设计变量在其容差内变化时分合闸速度的最大波动量最小化为优化目标，建立了具有多目标、两级优化的弹簧操动机构稳健优化设计数学模型。提出了一系列求解该数学模型的优化策略，运用经典的测试函数验证了所提出算法的可行性和收敛性。对此弹簧操动机构进行稳健优化,改善了真空断路器的分合闸速度特性。给出的数值算例显示了方法的有效性。

关键词: 弹簧操动机构, 稳健, 优化, 刚度系数, 测试函数