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

Maria Hammarqvist (Institutionen för material- och tillverkningsteknik) ; Jörgen Blennow (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Stanislaw Gubanski (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Alf-Peter Elg ; Anders Bergman ; Jan Wolbert
Conference Digest. 29th Conference on Precision Electromagnetic Measurements, CPEM 2014; Rio de Janeiro; Brazil; 24 August 2014 through 29 August 2014 (0589-1485). p. 618-619. (2014)
[Konferensbidrag, refereegranskat]

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.

Nyckelord: AC current, current transformer, frequency response, measurement technique, traceability, zero-flux

Article number 6898537

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Denna post skapades 2014-09-30. Senast ändrad 2014-10-28.
CPL Pubid: 203495


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