BI-POLARITY POTENTIAL TRANSFORMER FOR MEASURING D-C VOLTAGE

A bipolarity potential transformer for measuring the voltage between a d-c line and a reference point has unidirectionally conducting branches connected in inverse parallel relation between the d-c line and the reference point. Transductor-type d-c current transformers are respectively connected in the two branches for measuring current therethrough. The load circuits of the two transformers are connected together in such a manner that an output signal is obtained in which the component resulting from magnetizing current is at least practically cancelled. Balancing reactors having their secondary windings respectively connected in the load circuits of the current transformers and their primary windings respectively connected in the conductive branches inhibit the formation of certain notches in the wave form of the load circuit current which are attributable to magnetizing current.