NDLI: Investigations on harmonic interaction between 1500-kVA supply transformer and VFD load at an industrial plant

Content Provider	IEEE Xplore Digital Library
Author	Swamy, M.M. Rossiter, S.L.
Copyright Year	1997
Description	Author affiliation: MTE Corp., Menomonee Falls, WI, USA (Swamy, M.M.)
Abstract	The application of variable frequency drives (VFDs) in industrial and commercial facilities has seen tremendous increase in the last decade. When multiple VFDs are fed from one dedicated power transformer, care should be taken not to drive the transformer into saturation. At one industrial location, nine VFDs rated at 200 hp each, and fed from a single 1500 kVA air cooled transformer, showed saturation phenomenon which had the potential of causing serious damage to the transformer. This paper discusses the input AC current waveform asymmetry caused by the interaction of the transformer and the nine 200 hp VFD-load fed from it. The term waveform asymmetry is used when the positive half of the input AC current cycle is not equal to the negative half of the input AC current cycle. This results in the existence of DC components along with even harmonics in the input AC current waveform. The value of the inductance in the DC smoothing inductor (DC link choke), which is included as part of the VFD was found to contribute significantly to the waveform asymmetry. Experimental results showing the performance of a reconfigured DC link inductor to reduce its interaction with the power transformer are presented.
Starting Page	122
Ending Page	132
File Size	630264
Page Count	11
File Format	PDF
ISBN	0780338251
DOI	10.1109/ICPS.1997.596016
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-05-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power transformers Circuit faults Frequency Inductors Electrical equipment industry Cooling Harmonic distortion Inductance Industrial plants Energy management
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Harmonic interaction between 1500-kVA supply transformer and VFD load at an industrial plant

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