燃机发电机过激磁保护动作跳闸事故分析及处理

Gas turbine excitation protection action tripping accident analysis and processing

对一起燃气轮机发电机过激磁保护误动案例进行分析,找到保护误动作原因,并通过增加消谐小PT的改造方法消除了隐患,解决了问题。为防止保护误动作提供可靠的防范措施,完善了保护功能。提出的方案可为因机端PT一次侧不接地运行方式导致二次侧电压畸变进而产生后续问题的解决提供参考。

The maloperation case of a gas turbine over-excitation protection was analyzed to find out the cause of the protection maloperation. The hidden danger was eliminated by adding a harmonic elimination low-voltage potential transformer( PT).Countermeasures are proposed to prevent malfunction protection and improve the protecting function. Countermeasures can provide reference for the subsequent problems of the secondary side voltage distortion caused by the ungrounded operation mode of the primary side of the PT.