Monitoring circuit of converter transformer cooling system

The utility model discloses a monitoring circuit for a cooling system of a convertor transformer, belonging to the power transmission and distribution technical field. The circuit is used for solving the problem of cooling the convertor transformer. The utility model adopts the technical proposal that the circuit consists of a switching signal input circuit, a simulating signal input circuit, a programmable controller and an executive circuit. Output ends of the switching signal input circuit and the simulating signal input circuit are connected with the input end of the programmable controller. The executive circuit consists of a cooler control contactor. Control coils of the contactor are connected with the output end of the programmable controller. Contacts of each contractor are connected with a blower or an oil pump in the cooler. Compared with the control circuit of the prior convertor transformer cooling system, the circuit is complete in control function, high in operational reliability, and can meet the requirement of the direct current transformer for the cooling system.