电压并列及切换装置原理与PT常见故障

Introduction of the Voltage Juxtaposition and Switching Devices and Common Faults in Potential Transformer

当母线PT退出运行或者倒闸操作后,如果母线电压不能跟随设备运行方式的调整正确切换,运行过程中可能导致保护装置误动、拒动。为防范因电压切换或PT故障,本文详细分析了电站电压并列及切换装置的原理和PT的常见故障,有助于及时准确判断故障原因。

In case of the busbar potential transformer （PT） is out of service or performing switching operation, malfunction or failure of the protection device may occur if the busbar voltage cannot be switched correctly with the equipment operation mode. Thus, the working principles of the voltage juxtaposition and switching devices and common PT faults are analyzed in detail. It could help to determine the causes of different faults accurately and timely.