Power quality assessment of specially connected transformers

Authors:
Yao-Hung Chan;Chi-Jui Wu;Shu-Chen Wang
Affiliations:
Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan;Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan;Department of Computer and Communication Engineering, Taipei College of Maritime Technology, Taipei, Taiwan
Venue:
IMCAS'10 Proceedings of the 9th WSEAS international conference on Instrumentation, measurement, circuits and systems
Year:
2010

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Abstract

This paper examines and compares the voltage deviation, voltage unbalance, and harmonic distortion of V-V, Scott, and Le Blanc connected transformers by a novel approach. The power quality factors are needed to truly reflect the loading characteristics of these transformers. The computation results of several loading cases and simulation cases demonstrate the differences. The level of voltage unbalance of the V-V connection scheme is substantially worse than that of the Scott and Le Blanc connection schemes in normal operation. So the voltage deviation, voltage unbalance, and harmonic distortion are important indexes of power quality for these transformers.