Analysis and Improvement of Completely Shut Down Circuit of Nuclear Power Main Transformer Cooler

When the cooler of the main transformer of the nuclear power plant is completely shut down, the temperature of the winding and the oil will rise, which will accelerate the deterioration of the insulation of the winding, and then affect the service life of the main transformer. By analyzing the control and alarm loop of the cooler of the nuclear power plant, it is found that cooling will occur under special circumstances. The device is completely shut down, and there is no alarm information in the control room. In view of this situation, this paper proposes a corresponding improvement method and conducts field verification.