500kV自耦变压器冷却器异常情况的探讨

分析了500 kV丹溪变1号主变压器的冷却器控制原理及出现的异常情况。冷却器电源监视继电器设计采用三相保护继电器,运行经验表明,该类继电器的实际应用意义不大,反而经常误触发冷却器故障信号,还会给正常运行的变压器带来冷却器全停跳闸的安全隐患,应给予更换。

Discussion on Abnormal Situation of 500 kV Autotransformer Cooler

This paper analyses the control principles of the cooler for No.1 500 kV autotransformer in Danxi substation and its abnormal situation. The three-phase protection relay is adopted for power supply monitoring of the cooler. The operation practice indicates that the application of this type of relays is not desirable and the relays would often trigger cooler fault signals by mistake and cause hidden danger of cooler trip. Replace- ment of the three-phase protection relay is recommended.