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

Abstract

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 $30 \mu\text{rad}$ at frequencies up to 100 kHz and currents from 0.5 A to 10 A.