Communications signal coupling around wye/delta power transformation
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United States of America Patent
Stats
-
Jul 3, 1984
Grant Date -
N/A
app pub date -
Apr 13, 1982
filing date -
Apr 13, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit is disclosed for coupling a power line communications signal between two three-phase power lines, with the signal being transmitted in a balanced phase-to-neutral mode on the first line and in a phase-to-phase mode on the second line. The circuit includes two coupling transformers, one open-wye to open-delta, and the other open-delta to open-delta. The primary of one of the transformers is connected to one of the three-phase lines, while the primary of the other transformer is connected to the other three-phase lines. The secondaries of the transformers are connected together at one terminal of each and interconnected by a capacitor at the other terminal of each. Signal and power voltage ratios between the two power lines are matched, and the capacitor is selected to provide series resonance in the secondary loop of the coupling circuit at the power line communications signal carrier frequency.
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