OIL-IMMERSED ELECTRIC DEVICE

摘要

Provided is an oil-immersed electric device, in which a coil made of a coil copper wire wound by insulating paper is arranged in a tank filled with insulating oil. A sulfate detecting member, in which a pair of copper wires wound individually by the insulating paper contact at least partially, is made to contact with the insulating oil, thereby to detect a change in the insulating resistance between the paired copper wires. As a result, the detecting member can detect the precipitation of the copper sulfate on the insulating paper winding the coil copper wire of the coil arranged in the insulating oil, thereby to prevent the dielectric breakdown, as might otherwise be caused by the precipitation of the sulfate, between the coil turns.