大容量发电机保护断路器用弧触头系统动力学研究

Study on Dynamics of Arc Contact System for Large Capacity Generator Protection Circuit Breaker

大容量发电机保护断路器是大型发电机组重要的保护装置,其灭弧室内采用主、弧触头异速的运动装置,弧触头系统采用了新型的五连杆机构,文中分析了该运动装置的弧触头系统的受力特性。针对大容量发电机断路器用弧触头系统高速运动、大动力传动且通过分段连续轨道实现异速的特点,首先采用向量和矩阵相结合的解析法计入惯性力;然后研究各段曲线轨道对滚子作用力的共性关系,建立了计入惯性力的通用矩阵模型;最后采用数值分析的迭代法计入摩擦力,获得了异速弧触头系统的动力学特性。文中介绍的动力学研究模型及分析方法可为大容量发电机断路器系列产品用弧触头系统的受力分析提供理论依据,适用于大容量发电机断路器用弧触头系统的设计及优化。

Large capacity generator protection circuit breaker is an important protection device for large generator sets,a motion device with different velocities of main and arc contact is adopted in its interrupter.The arc contact system adopts a new five-link mechanism and the stress characteristics of arc contact system of the motion device are analyzed in this paper.In view of such characteristics of the arc contact system for large capacity generator circuit breaker as high-speed motion,large power transmission and different velocities achieved by segmented continuous track,the inertial force is calculated firstly by means of dynamic force analysis combined with vector and matrix.Then,the common relation of the forces of each curve track on the roller is studied,thus a universal matrix model including inertial force is derived.Finally,the friction force is calculated by numerical iteration method,thereby the dynamical characteristics of the arc contact system with different-velocity are obtained.The dynamical research model and analysis method introduced in this paper can provide a theoretical basis for the force characteristics of the arc contact system for large capacity generator circuit breaker series products,and are suitable for the design and optimization of arc contact system for large capacity generator circuit breakers.