1. When the working power supply of section I and II of the cooler is lost, the signal of “#1, #2 power supply failure” is sent out, and the main transformer cooler full stop trip circuit is connected. It should be reported to the dispatcher immediately, and the set of protection should be deactivated.

2. When the switching of the working power supply of stage I and II fails during operation, the “cooler full stop” is on, and the main transformer cooler full stop trip circuit is connected at this time. It should be reported immediately to the dispatcher to disable this set of protection, and the manual operation should be carried out quickly. Switching, such as KM1, KM2 failure, can not be strong excitation.

3. When any one of the cooler circuits fails, isolate the faulty cooler circuit.