一种合闸线圈寄生回路监测装置

A Device for Monitoring Closing Coil Parasitic Circuit

针对因合闸回路异常引发的高压断路器误动、拒动及控制回路损坏等问题,提出利用监测合闸线圈两端压降变化来判定合闸线圈状态的方法.根据该方法设计一种合闸线圈寄生回路监测装置,判断合闸线圈是否存在寄生回路并及时发出告警信号.经试验证明,该装置能有效监视合闸线圈的状态,保证控制回路维持良好的工作状态.

To address the problems with high voltage circuit breaker malfunction, rejection and control circuit damage caused by abnormal closing circuit, this paper proposes a new method which determines the state of closing coil by monitoring the changes of the pressure drop across the closing coil. According to this method, a device for monitoring closing coil parasitic circuit is designed to decide whether there is a parasitic loop in the brake coil and can send alarm signals. The experiments show that the device can effectively monitor the closing coil state and thus can make sure that the control loop works in good conditions.