Development of 800 kV spiral air-cored transformer with high turn ratio

The basic theory and some key technologies of the air-cored transformer in design are introduced, and a helical line air-cored transformer with high turn ratio is designed. The primary winding is a 3-turn copper sheet, and the secondary winding is a conical winding with 1 800 turns. The output voltage of the transformer is simulated by Pspice, and then the experiment is done. The results of testing show that, the output voltage of the air-cored transformer is up to 900 kV, when the charge voltage of the primary capacitor is 2 400 V.