| 摘要 |
An apparatus and method for substantially reducing zero sequence harmonic currents at the load-end of branch circuits that supply single-phase, non-linear loads. The invention includes a three-phase, six-terminal, zig-zag autotransformer which functions as the zero sequence filter. The first winding, which is located on the first core leg, is connected in series with the sixth winding, which is located on the third core leg. The third winding, which is located on the second core leg, is connected in series with the second winding, which is located on the first core leg. The fifth winding, which is located on the third core leg, is connected in series with the forth winding, which is located on the second core leg. In this configuration, the first winding is magnetically coupled to the second winding, the third winding is magnetically coupled to the forth winding and the fifth winding is magnetically coupled to the sixth winding.
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