What is an Open Delta Transformer

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In three phase systems, the use of transformers with three windings (or legs) per side is common.  These three windings are often connected in delta or star, resulting in common transformer configurations such as delta-delta or delta-star.  An open delta transformer is a special arrangement which uses only two windings......Read More..

By Steven McFadyen on Monday, October 13, 2014

Generator Sizing & Operation Limits

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When selecting a generator, there are inherent limits on the active and reactive power which can be delivered. Generators are normally sized for a certain kW at a power factor of 0.8. However, to understand the operation fully, it is necessary to look at the generator reactive power curve....Read More..

By Steven McFadyen on Monday, November 01, 2010

Star-Delta Motor Starting - Performance

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Many questions sent in to the site are in connection with motor starting and in particular star-delta.  For all but the simplest application, there is merit in performing a more detailed study.  Carrying out a software study allows both the electrical performance and that of the connected mechanical systems to be evaluated......Read More..

By Steven McFadyen on Thursday, July 10, 2014

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6 days ago

    pht answered the question Cable sizing

    1 week ago

    Steven McFadyen added a new article What is an Open Delta Transformer

    In three phase systems, the use of transformers with three windings (or legs) per side is common.  These three windings are often connected in delta or star, resulting in common transformer configurations such as delta-delta or delta-star.  An open delta transformer is a special arrangement which uses only two windings.

    2 weeks ago

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