电机操动机构断路器触头过冲与反弹的抑制

Suppression of Overshoot and Rebound of Circuit Breaker Contacts Driven by Motor Operating Mechanism

为了抑制断路器合闸操作过程中的触头过冲与反弹现象,改善电机操动机构输出特性,文中通过分析电机操动机构断路器触头合闸运动过程,计算得到断路器动触头行程与驱动电机负载转矩之间数学关系,利用分段控制策略对电机操动机构驱动电机输出转矩进行调节,实现触头过冲与反弹的有效抑制。研制以数字信号处理器(DSP)为核心的控制装置,开展126 kV真空断路器电机操动机构合闸操作实验,对实验过程中的触头行程多组数据进行对比分析。结果表明:驱动电机在转动0°~10°,10°~36°,36°~64°角度时分别采用调制占空比1,0.4,0.8能有效抑制触头过冲与弹跳,且电机操动机构响应时间短,保证了电机操动机构合闸操作可靠性,提高了合闸能力。

In order to suppress the overshoot and rebound of the contact during the closing operation of the circuit breaker and improve the output characteristics of the motor operating mechanism,the paper analyzes the closing movement process of the circuit breaker contact of the motor operating mechanism.The mathematical relationship between the moving contact stroke of the circuit breaker and the load torque of the driving motor is obtained.The closedloop segmentation control strategy is used to adjust the output torque of the motor operating mechanism drive motor to achieve effective suppression of contact overshoot and rebound.The control device with digital signal processor(DSP) as the core is developed,and the closing operation experiment of the 126 kV vacuum circuit breaker motor operating mechanism was carried out.The data of the contact strokes in the experimental process are compared and analyzed.The results show that when the driving motor rotates at 0°~10°,10°~36°,360°~64° respectively,the duty cycle of 1,0.4 and 0.8 can effectively restrain the overshoot and rebound of the contact,and the response time of the motor control mechanism is short,which ensures the reliability of the permanent magnet mechanism closing operation,improved the ability to close.