Original scientific paper

A CIRCULAR LOOP TIME CONSTANT STANDARD

Martin Dadić orcid.org/0000-0001-7446-0024 ; Faculty of Electrical Engineering and Computing / FER, Zagreb, Croatia
Monika Sandelić ; Petrović
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

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. The power coefficient of the standard is determined, and limits of errors are discussed.

Keywords

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

Hrčak ID:

211704

URI

https://hrcak.srce.hr/211704

Publication date:

1.5.2018.

Visits: 1.049 *