The utility model discloses a control unit that is used for transformer intelligence to transship to ally oneself with and cut device, including the host processing ware, quantity of state input interface, quantity of state output interface to and the AD converting circuit and the memory cell that link to each other with the host processing ware, the quantity of state input interface passes through input optical coupling isolation circuit and links to each other with AD converting circuit, and the quantity of state output interface passes through output optical coupling isolation circuit and links to each other with the host processing ware, the input of quantity of state input interface links to each other with NULL transform module, temperature measurement module respectively, the output of quantity of state output interface and the outlet relay that the device was cut to transformer intelligence overload antithetical couplet link to each other. The control unit except that control transformer high -pressure side overcurrent minute wheel is surely loaded, can also differentiate the overload situation of transformer according to transformer top oil temperature and hot -spot temperature to the cross state of loading of load excision in order to eliminate the transformer is selected to the minute wheel, with the safety and stability operation level that improves electric power system.