OIL TEMPERATURE DETECTION DEVICE FOR OIL-IMPREGNATED ELECTRIC EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To prevent generation of temperature measurement errors by a structure including a tank housing an electric equipment and charged with an insulating oil, a flange protruding outward from a wall of the tank and forming a recess inside, a plate-like member closing the flange, and a plurality of temperature detection elements mounted on the plate-like member for detecting the temperature of the insulating oil in the recess. SOLUTION: An insulating oil 29 having its temperature raised by cooling a transformer body 25 raises the temperature of insulating oils 42-44 to substantially the same temperature as the insulating oil 29 via protection tubes 39-41. The temperature of the insulating oils 42-44 is detected by each of temperature detection elements 33-35. The temperature detected by the temperature detection element 33 is verified with the temperature of a winding by a resistance thermometer 46. The temperature detected by the temperature detection element 34 is measured as the temperature of the insulating oil 29 by a dial thermometer 47. When the temperature detected by the temperature detection element 35 is not lower than a predetermined temperature, an oil temperature relay 48 is actuated. Thus, the temperature detection elements 33-35 may be concentrated in one place, and generation of temperature measurement errors may be prevented.