Two core phase angle regulating transformer
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United States of America Patent
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Dec 6, 1994
Grant Date -
N/A
app pub date -
Apr 27, 1993
filing date -
Apr 27, 1993
priority date (Note) -
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Abstract
An improved phase angle regulator with about 70% of the total impedance in the series unit and 30% in the excitor unit. In order to balance the physical size of both units, the excitor unit includes an interleaved winding arrangement. On large phase angle regulators, the higher impedance in the series unit allows for the use of a three-leg core design, and the low impedance interleaved excitor unit can also be designed on a three-leg core. The higher impedance series unit reduces the zero sequence current in the unit by about 40% during a single line to ground fault. Also the interleaved winding arrangement in the excitor unit improves its short circuit withstand capability.
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