The Temperature Control lnstrument of JL-BLD series transformer belongs to the new generalion of intelligent-type of product, specially designed for the safe operation of the dry-type of transformer, it adopts the new type of soft ware anti-interference design, and can make corresponding judge according to the condition of the rising temperature of the transformer to control turning on or turening off the cooling wind machine to reduce the transflrmer temperature and improve the transformer load ablity. It also can have a warning function when there happens something special, it is essential, it is essential auxiliary equipment for the dry-type transformer to operate safely. This temperature controller has the display of the temperature of therr-phase roving/Top-phase and can make the mutual swith of the two functions; input the open circuit and fault self-check, display and output overtemperature alarm, the functions of indicating value compensation and storage, the automatic/manual control of the on-off of the blowe, ober-temperature trip display and output,blowe’s timing start amd output function check. For the blowe to control the active output can directly parallel 6 onephase blowers, and can provide RS485/232 serial communication function(communication distance 1200m)according to the requirement of the user, the environment temperature of the macheine room of roadl and control output, or the temperature meawure of iron core of the transformer of poadland alarm output.