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US 5,206,539 AGranted
Transformer with cancellation of harmonic currents by phase shited secondary windings
AssigneePower Distribution, Inc.
InventorJohn B. Kammeter
Life of this patent
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Abstract
A harmonic current filtering transformer includes a three-phase input winding and at least two wye-connected three-phase output windings. The output windings are 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.
Claims25
A transformer, comprising:
- at least one transformer core;
- a three-phase primary input winding;
- and
- at least two three-phase wye-connected output windings,
- wherein said output windings are phase-shifted relative to each other to cause magnetic flux vectors generated in said core by harmonic currents present in the output windings to add to zero for respective orders of selected harmonic currents and thereby prevent the selected harmonic currents present in the output windings from being induced in said input windings.
2 more elements
A transformer, comprising:
- at least one transformer core;
- a three-phase primary input winding;
- and
- at least two three-phase wye-connected output windings,
- wherein said output windings are phase-shifted relative to each other to cause magnetic flux vectors generated in said core by harmonic currents present in the output windings to partially cancel for respective orders of selected harmonic currents to thereby prevent the selected harmonic currents present in the output windings from being induced in said input windings.
2 more elements
Dependencies are inferred from the claim text.