The utility model discloses a current conversion station change of current becomes cooler control system, this system increase by the manual on -off switch of emergency power source, throw by force isolator, first group cooler and throw control switch, second group cooler by force and throw control switch, third group cooler by force and throw control switch, fourth group cooler by force and throwfemale the arranging of control switch and third by force and form the volume and throw the switch board by force in the technique of former change of current power converter cooler switch board. Theutility model discloses after a power supply contactor and the equal trouble of the 2nd power supply contactor result in the cooler full cut -off, can and throw isolator by force and insert stand -bypower supply through the manual on -off switch of emergency power source, recover the change of current rapidly and become cooler normal operating, guarantee that the change of current becomes the safety and stability operation.