What are the methods of transformer drying treatment?
1 、 induction heating method
The method is to place the device in the tank, and the coil of the outer winding is connected with the power frequency current to dry by the heat of eddy current loss in the oil tank wall. The temperature of the box wall shall not exceed 115~120 degrees centigrade, and the temperature of the body shall not exceed 90~95 degrees centigrade. In order to winding the convenience, as much as possible to make the coil less turns or less current, the general current selected 150A, wire can be used 35~50mm2 wire. A plurality of tampons can be placed on the wall of the tank, and the wires are wound around the asbestos strip.
2. Hot air drying method
The method is to put the dryer in a dry room and dry through the hot air. The temperature of the imported hot air should rise gradually. The maximum temperature shall not exceed 95 degrees, and filters shall be installed at the hot air inlet to prevent the entry of sparks and dust into the human body. Hot air blowing device not directly, as uniform as possible from the body of the wind in all directions, so that the moisture released by the box cover hole.
Products comply with VI), E0550, IEC439, JB5555, GB5226 and other international and national standards.