The invention relates to an oil surface thermograph for a
transformer, which is used for detecting and controlling
oil temperature of the
transformer and comprises a casing 1, a thermograph control module 2, terminals 3, a
mechanical counter 4, a temperature sensor 5 and a synchronous
pulley component 6, wherein the thermograph control module 2, the terminals 3, the
mechanical counter 4, the temperature sensor 5 and the synchronous
pulley component 6 are arranged in the casing 1. The thermograph control module 2 is arranged in a shell 7 and connected with the temperature sensor 5 and the synchronous
pulley component 6 and comprises a temperature
signal regulation and acquisition circuit, a single-
chip microcomputer, a
data transmission circuit, a temperature
signal conversion circuit, a
motor module, a
relay and a watchdog. Complex temperature sensors and elastic transmission parts thereof are omitted, no complex fan control mechanism is adopted, and precision measuring, displaying and
signal transferring of the oil surface temperature of the
transformer and intelligent interaction with a secondary instrument or computer are realized by means of the simple and reliable structure and the mechatronic sensing and control technique. Further, since all control circuits are mounted in the closed casing of an
electromagnetic interference resistant design, the oil surface thermograph is high in
electromagnetic interference resistance and simple in maintenance, reliability is greatly improved while the service life is greatly prolonged, and manufacturing cost is greatly reduced.