Improvement of Frequency Response for a Zero-Flux Current Measuring System
Paper in proceeding, 2014
Magnetic zero-flux current transformers are widely utilized to measure AC and DC electrical currents. To improve the AC characteristics between 10 Hz and 100 kHz, a method is proposed to evaluate adjustments in the circuitry; increase of the amplification in the AC feed-back circuit and introduction of an external coaxial read-out shunt resistor. The method is generally applicable and includes a coaxial current path within the entire reference system and traceability to national standards. The AC working range is extended from about 1 kHz to about 3 kHz. Outside the nominal AC working range, the scale factor variation is reduced from 45 % to 3.5 % and the phase angle error offset changes from ca 5.8 µs to below 0.3 µs.
traceability
AC current
frequency response
measurement technique
current transformer
zero-flux
Author
Maria Hammarqvist
SP Sveriges Tekniska Forskningsinstitut AB
Chalmers, Materials and Manufacturing Technology, High Voltage Engineering
Alf-Peter Elg
SP Sveriges Tekniska Forskningsinstitut AB
Anders E. Bergman
SP Sveriges Tekniska Forskningsinstitut AB
J. Wolbert
PM Special Measuring Systems
Jörgen Blennow
Chalmers, Materials and Manufacturing Technology, High Voltage Engineering
Stanislaw Gubanski
Chalmers, Materials and Manufacturing Technology, High Voltage Engineering
CPEM Digest (Conference on Precision Electromagnetic Measurements)
0589-1485 (ISSN)
618-619Areas of Advance
Energy
Materials Science
Subject Categories
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/CPEM.2014.6898537