BAUER, J., et al. Demagnetization of Current Transformers Using PWM Burden. IEEE Transactions on Magnetics. 2015, 51(1), ISSN 0018-9464. DOI 10.1109/TMAG.2014.2356574.
Current transformers (CTs) show large errors when they are magnetized by dc current. This error can be reduced after proper demagnetization. One of the methods to demagnetize the CT is to increase the core flux by increasing its burden. The burden should be adjusted according to the measured ac current. In this paper, we show that pulsewidth modulation switchable resistor
can be used as variable burden for this application. This method enables to restore the nominal precision of the heavily magnetized CT from 2.5% back to 0.2% without interruption of the CT operation.
eng
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
IEEE
dc.relation.ispartof
IEEE Transactions on Magnetics
dc.subject
Current transformer (CT)
eng
dc.subject
lock-in amplifier
eng
dc.subject
pulsewidth modulation (PWM)
eng
dc.title
Demagnetization of Current Transformers Using PWM Burden