一种采用开关阀实现断路器速度调节的方法

An Approach to Changing the Breaking Velocity Characteristic of a Circuit Breaker

针对现有断路器分闸速度特性不可调节的现状 ,通过对断路器分闸运动方程中力参数的分析 ,从理论上得出通过调节回油路压力损失系数改变断路器液压机构的出力特性 ,从而改变断路器的分闸速度特性 .根据液压原理提出在回油路加装快速开关阀控制模块 ,通过控制快速开关阀的状态实现断路器多种分闸速度特性的方案 .从理论上建立了采用这种方案断路器的运动方程 ,并通过仿真分析验证了这种方案可有效实现多种速度特性 ,在正常开断时可以降低液压机构的冲击和操作功 。

At present,the breaking velocity characteristic of a circuit breaker is unchangeable.The authors put forward an approach to solving this problem.After the motion equation of the circuit breaker with direct acting hydraulic mechanism was analyzed,it is held that the breaking velocity characteristic of the circuit breaker can be changed by changing the pressure loss coefficient of oil return circuit. A quick electricmagnetic on off valve and a choke valve are added in the hydraulic mechanism,two breaking velocity characteristics can be obtained by changing the “on”and “off”states of the on off valve.More on off values are added,more breaking velocity characteristics can be obtaimed. The “on” and “off” states are controlled by the signal given by electric netword.The motion equation of the circuit breaker with improved the hydraulic mechanism was established.The approach is proved to be effective by simulation analysis.The service life of the circuit breaker can be increased because of the little impact force and operating work of the improved hydraulic mechanism.