These transformers are designed to generate two different current and tension waves to enable the operation of either 6 or 12 pulses drives or rectifiers. They are designed taking into account the effects of on-load high harmonic charges and the overloads generated by them. In addition, electrostatic shields are provided to minimize the on-load harmonic effects over the primary circuit. These types of transformers are usually used in electrolytic processes, electroplating, and other industrial processes where direct current is applied.