Comparison of phase angle errors of current shunts between NMIA and NIM

This paper describes a comparison of current shunt phase angle error measurement between NMIA and NIM at frequencies from 1 kHz to 100 kHz. A set of cage design shunts has been developed at NMIA and their phase angle errors determined with Thermal Power Converter (TPC) and step-up method. A set of Inductive Current Dividers (ICDs) with ratio of 2:1, 5:1 and 10:1 have also been developed to measure the phase angle errors of shunts at NIM. Based on two totally different methods, the current shunts at range from 0.5 A to 10 A have been compared at frequencies up to 100 kHz. The phase angle error values measured by two different methods show excellent agreement, within 30 μrad at frequencies up to 100 kHz and currents from 0.5 A to 10 A.