DC bias elimination and integrated magnetic technology in power transformer

This paper studies the DC bias phenomenon of power transformer and integrated magnetic. A new transformer with function of DC bias elimination is designed based on nano-composite magnetic material and a controllable reactor is integrated into the transformer via integrated magnetic technology. Mathematical model of hysteresis of the magnetic material is established and the correspondence relationship between coercivity and remanence of this material is determined; DC magnetic potential in transformer core can be eliminated directionally using the conversion of coercivity and remanence. The integrated controllable reactor has the notable characteristics of decoupling with other windings, high linearity, less extra covering area, and energy saving^[1]. It also can be used for power system reactive power compensation which verifies the correctness and feasibility of the design.