Modeling and analysis of unsymmetrical transformer banks serving unbalanced loads

Journal Article · Wed May 01 04:00:00 EDT 1996 · IEEE Transactions on Industry Applications

DOI:https://doi.org/10.1109/28.502187· OSTI ID:264218

Kersting, W H ^[1]; Phillips, W H ^[2]

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1. New Mexico State Univ., Las Cruces, NM (United States). Coll. of Engineering
2. WH Power Consultants, Las Cruces, NM (United States)

It is a common practice to serve combination three-phase and single-phase loads from an unsymmetrical three-phase transformer bank and a four-wire secondary. Depending upon the loads and company standards, nine different transformer connections can be considered along with either an open four wire or a quadraplex secondary. The selection of the proper connection and transformer ratings can be achieved by the correct modeling and analysis of a system consisting of an equivalent source, transformer bank, secondary, and loads. This paper develops the models for the nine transformer connections, the secondary, and the loads. A computer program has been written that allows the analysis of the system for loading and short-circuit studies. The paper includes several examples of different normal and abnormal operating conditions on some of the transformer connections.

• OSTI ID: 264218
• Journal Information: IEEE Transactions on Industry Applications, Journal Name: IEEE Transactions on Industry Applications Journal Issue: 3 Vol. 32; ISSN 0093-9994; ISSN ITIACR
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
COMPUTER-AIDED DESIGN
LOAD ANALYSIS
MATHEMATICAL MODELS
POWER DISTRIBUTION SYSTEMS
TRANSFORMERS