A New Potential Transformer Using Orthogonal-Flux-Type Amorphous Core

Commercially available amorphous magnetic tape was used to construct a four-legged orthogonal core, and used in a three-phase transformer. A tuning capacitance Cs was connected to both ends of the detection winding Nv to obtain the output voltage ev. The bus frequency component output voltage could be obtained by adjusting Cs. Without Cs, the effective output voltage Ev increase with increasing unbalanced voltage E1, but with Cs connected and a balanced voltage, the output reached a minimum, V-shape output characteristics suitable for unbalanced voltage detection were obtained, and detection of unbalanced voltage and zero-phase voltage without a neutral point was possible.