PORTABLE TESTER AND RELATED METHOD FOR DETERMINING THE PRIMARY WINDING TO SECONDARY WINDING CURRENT RATIO OF AN IN-SERVICE CURRENT TRANSFORMER

摘要

A portable controller for determining the transformation ratio between the primary winding (18) and the secondary winding (22) of a current transformer (16) in operation and comprising a current probe (40) having a slotted core located around the active power line (14) supplying the current to the transformer, a converter (44) of alternating current into direct current for converting the AC output of said probe into a first DC signal, a second converter (56) of alternating current to direct current converter for converting the secondary output of the current transformer under the control of a second DC signal, and a meter quotient (46) for converting the first and second DC signals a visual display of the relationship between these signals. The present invention also comprises a device (42) designed to ensure the exact positioning of the decimal point in the quotient meter. Control of polarity and expenses is made.