Title :
Simple absolute method for current transformer calibration
Author :
Corney, Andrew C.
Author_Institution :
Meas. Standards Lab. of New Zealand, Ind. Res. Ltd., Lower Hutt, New Zealand
fDate :
4/1/2001 12:00:00 AM
Abstract :
A simple mains-frequency current transformer ratio build-up scheme has been developed which enables calibration by absolute means of ratios from 5 A:5 A to 500 A:5 A with uncertainties of 0.03 parts in 106 and 0.05 μrad. The build-up is based on series-parallel interchange of primary windings of two-stage transformers with magnetically shielded second stages
Keywords :
calibration; current transformers; electric current measurement; measurement standards; measurement uncertainty; 5 A; 500 A; CT ratio scale; absolute method; comparison circuit; current transformer calibration; current transformer ratio buildup scheme; equivalent circuit; low uncertainty; magnetically shielded second stages; mains-frequency; power standard; primary windings; series-parallel interchange; traceability; two-stage transformers; Calibration; Capacitance; Couplings; Current transformers; Electrical equipment industry; Impedance; Magnetic cores; Measurement standards; Toroidal magnetic fields; Transformer cores;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
