Electrical transmission or interconnection systems – With harmonic filter or neutralizer
Patent
1994-08-05
1995-07-18
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
With harmonic filter or neutralizer
336 5, H02J 301
Patent
active
054344557
ABSTRACT:
A harmonic current filtering transformer includes a three-phase input winding and at least two wye-connected three-phase output windings. Windings for each of the phases includes an in-phase coil connected between a common neutral and vector coils for each of the other two phases, the output windings thereby being phase shifted relative to each other by an amount which causes harmonic currents generated by a non-linear load to magnetically cancel in the transformer core. The harmonic current filtering transformer may be used as part of a harmonic cancelling power system which includes multiple linear and nonlinear loads, and protective devices, switches, filters and other components on both the input and output sides of the transformer as in a conventional power system since the harmonic cancelling transformer does not require additional secondary windings or other electrical components previously thought necessary to achieve harmonic cancellation.
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Gaffin Jeffrey A.
Power Distribution Inc.
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