The cores are wound by automatic core winding machine with a continuous silicon steel strip and are annealed in high vacuum furnace under protection atmosphere or in continuous tunnel furnace. The impregnation is done in vacuum impregnating equipment. The advanced manufacturing process makes full use of grain orientation of silicon steels, so that the core enjoys advantages such as compact volume, light, low magnetic leakage and humming, high efficiency, stable quality etc. Specifications: Toroidal core A series may be supplied: 1. Uncut, not impregnated 2. Uncut, edge bonded 3. Uncut, impregnated 4. Uncut, epoxy coated 5. Cut, impregnated Applications: Power transformer, current transducer, instrument transformer, inductor, ballast, AF transformer, magnetic amplifier, voltage stabilizer and regulator, etc