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

摘要

ABSTRACT OF THE INVENTIONA portable tester for determining the primary winding tosecondary winding current ratio of a current transformer whilethat transformer is in service, including a current probe havinga split core positionable around an active power line supplyingcurrent to the transformer, an AC to DC converter to convert theAC output of that probe to a first DC signal, another AC to DCconverter for converting the secondary output of the currenttransformer under test to a second DC signal, and a ratio meterfor converting the first and second DC signal into a visual dis-play of the ratio of those signals. A mechanism is provided forassuring proper location of the decimal point on the ratio meter.Polarity and burden testing is also provided.