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Communications signal bypass around power line transformer

  • US 4,473,816 A
  • Filed: 04/13/1982
  • Issued: 09/25/1984
  • Est. Priority Date: 04/13/1982
  • Status: Expired due to Fees
First Claim
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1. A circuit for bidirectionally bypassing a delta-wye transformer, having a primary-to-secondary voltage ratio R, with a communication signal having a carrier frequency, which signal is to be transmitted as a balanced phase-to-neutral signal on first three phase lines and neutral on the delta windings side of the transformer and on second three phase lines and neutral on the wye windings side thereof, comprising:

  • a set of three capacitors, each having one side thereof connected at a node to form a wye configuration, and each having the other side connected to a different one of the lines on the delta side of the delta-wye transformer;

    a single phase transformer with a primary winding connected between the node of the wye configuration of capacitors and said first neutral, and having a secondary winding with a first terminal thereof connected to said second neutral;

    another capacitor with capacitance C2 having one terminal thereof connected to the node of the wye windings of the delta-wye transformer and the other terminal thereof connected to a second terminal of the secondary winding of the single phase transformer; and

    an inductive reactor with inductance L connected between the node of the wye windings of the delta-wye transformer and said second neutral.

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