Improvement of Frequency Response for a Zero-Flux Current Measuring System
Paper i 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

zero-flux

current transformer

measurement technique

frequency response

AC current

Författare

Maria Hammarqvist

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

Jörgen Blennow

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

Stanislaw Gubanski

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

Alf-Peter Elg

PM Special Measuring Systems

Jörgen Blennow

Chalmers University of Technology

Henrik Hillborg

Chalmers University of Technology

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

Styrkeområden

Energi

Materialvetenskap

Ämneskategorier

Annan elektroteknik och elektronik

DOI

10.1109/CPEM.2014.6898537

ISBN

978-1-4799-5205-2