Excitation system cooling blower power return circuit

The utility model discloses an excitation system cooling blower power return circuit, it contains: first via power, second way power, third way power, fourth way power, a power supply switching circuit, first via power and second way power respectively through a power supply switching circuit with a cooling blower connect, the 2nd power supply switching circuit, first via power and third way power respectively through the 2nd power supply switching circuit with the 2nd cooling blower connect, the 3rd power supply switching circuit, second way power and fourth way power respectively through the 3rd power supply switching circuit with the 3rd cooling blower connect, fourth power supply switching circuit, third way power and fourth way power respectively through fourth power supply switching circuit with fourth cooling blower connect. Its advantage is: the switching of dual supply in the rectification cabinet has been realized all through alternately it all has two way powers to get the electricity to every rectification cabinet cooling blower's power, and the reliability is higher.