Improvement of Frequency Response for a Zero-Flux Current Measuring System
Paper in proceedings, 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

Conference Digest. 29th Conference on Precision Electromagnetic Measurements, CPEM 2014; Rio de Janeiro; Brazil; 24 August 2014 through 29 August 2014

0589-1485 (ISSN)

618-619

Areas of Advance

Energy

Materials Science

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/CPEM.2014.6898537

More information

Latest update

11/30/2018