A Circular Loop Time Constant Standard

Martin  Dadić; Monika  Sandelić; Hrvoje  Hegeduš; Goran  Petrović

doi:10.37798/201867184

Authors

Martin Dadić University of Zagreb, Faculty of Electrical Engineering and Computing / FER, Zagreb, Croatia
Monika Sandelić Aalborg University, Department of Energy Technology, Aalborg, Denmark
Hrvoje Hegeduš University of Zagreb, Faculty of Electrical Engineering and Computing / FER, Zagreb, Croatia
Goran Petrović University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval, Architecture, Split, Croatia

DOI:

https://doi.org/10.37798/201867184

Keywords:

time constant standard, circular loop, phase angle measurement, thermostat, Finite Element Method (FEM)

Abstract

A time constant standard, developed for the phase angle measurement of precision current shunts is developed and described, and its time constant has been determined. Based on a single circular loop placed in an air thermostat, its construction is very simple and it gives accurate results in the frequency band of interest, e.g. for frequencies between 50 Hz and 100 kHz. The influence of the shielding is calculated using numerical Finite Element Analysis (FEA). The thermostatic stability is analyzed, and the time-constant of the thermostat is determined using temperature measurement and Butterworth filtering.