INSTRUMENT FOR MEASURING TAN DELTA WITHOUT ANY INFLUENCE OF OUTSIDE INDUCED VOLTAGE

摘要

PROBLEM TO BE SOLVED: To provide an instrument for measuring tanδ wherein tanδ of various electric devices connected to a single phase cable or a three-phase cable can be accurately measured in a hot line state or a non hot line state. ;SOLUTION: Accurate tanδ is found without any influence of an alternating component as a voltage signal e_i proportional to leakage current I of an electric device to be measured H, direct current component output ED having multiplied a signal e_v proportional to applied voltage of the device H and other direct current component output EDT obtained to multiply a signal eVT in which the signals e_i and e_v are 90-degree phase-shifted are made an input signal of a division circuit 14.;COPYRIGHT: (C)1997,JPO