NDLI: Symmetrical and unsymmetrical voltage sag effects on three-phase transformers

Content Provider	IEEE Xplore Digital Library
Author	Pedra, J. Sainz, L. Corcoles, F. Guasch, L.
Copyright Year	1986
Abstract	This paper studies the effects of symmetrical and unsymmetrical voltage sags on three-phase three-legged transformers. The transformer model includes saturation and the parameters have been obtained from experimental measurements. The study shows that sags can produce transformer saturation when voltage recovers. This saturation produces an inrush current that is similar to the inrush current produced during the transformer energizing. The study takes into account that the voltage recovery instant can take only discrete values, since the fault-clearing is produced in the natural current zeroes. The paper also studies the influence of the sag type, duration, depth and fault current angle on the inrush current peak value. The current peak has a periodical dependence on sag duration, and a linear dependence on depth. Unsymmetrical sags can result in current peaks as high as those of symmetrical sags.
Sponsorship	IEEE Power Engineering Society
Starting Page	1683
Ending Page	1691
Page Count	9
File Size	905260
File Format	PDF
ISSN	08858977
Volume Number	20
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage fluctuations Phase transformers Surges Magnetic flux Magnetic separation Saturation magnetization Power quality Leg Predictive models Fault currents voltage sag Inrush current transformer model
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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