Switch bypass circuit for power line communication systems

• US 4,686,382 A
• Filed: 08/14/1985
• Issued: 08/11/1987
• Est. Priority Date: 08/14/1985
• Status: Expired due to Term

• Current Assignee: ABB Power T&D Limited (ABB Limited)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Shuey, Kenneth C.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Logan, Sharon D.
• Application Number:
  US06/765,470
• Time in Patent Office: 727 Days
• Field of Search: 307/17, 307/30, 307/38, 307/96, 307/149, 333/126, 333/129, 333/131, 333/132, 333/134, 333/176, 333/177, 361/13, 361/81, 340/310 R, 340/310 A
• US Class Current: 307/149
• CPC Class Codes: H04B 2203/5416 by adding signals to the wave form of the power source
• CPC Class Codes: H04B 2203/5433 Remote metering
• CPC Class Codes: H04B 2203/5466 using three phases conductors
• CPC Class Codes: H04B 2203/5479 using repeaters
• CPC Class Codes: H04B 2203/5483 using coupling circuits
• CPC Class Codes: H04B 2203/5491 using filtering and bypassing
• CPC Class Codes: H04B 3/56 Circuits for coupling, blocking, or by-passing of signals

Abstract

A signal bypass apparatus for a power line distribution switch incorporates two portions that are electrically connected together in parallel with a power line switch. Each portion comprises a transformer that is connected electrically in parallel with an inductor. A capacitor is connected between the transformer and the inductor of each portion and the assembly is connected between one side of a power line distribution switch and ground. The other portion of the bypass apparatus is similarly configured and connected between the other side of the power line distribution switch and ground. In one embodiment, the bypass apparatus is electrically connected to a transceiver.

Claims

1. Apparatus for coupling a power line communication signal around a switch, comprising:

a first transformer having a primary winding and a secondary winding;

a first inductor connected electrically in parallel with said primary winding of said first transformer, a first terminus of said primary winding of said first transformer being connected to ground;

a first capacitor being connected electrically in series between a second terminus of said primary winding of said first transformer and said first inductor, a first side of a power line switch being electrically connectable to said first capacitor between said first capacitor and said first inductor;

a second transformer having a primary winding and a secondary winding;

a second inductor connected electrically in parallel with said primary winding of said second transformer, a first terminus of said primary winding of said second transformer being connected to ground;

a second capacitor being connected electrically in series between a second terminus of said primary winding of said transformer and said second inductor, a second side of a power line switch being electrically connectable to said second capacitor between said second capacitor and said second inductor;

a first terminus of said secondary winding of said first transformer being connected in electrical communication with a first terminus of said secondary winding of said second transformer; and

a second terminus of said secondary winding of said first transformer being connected in electrical communication with a second terminus of said secondary winding of said second transformer;

a transceiver connected in electrical communication with said first terminus and said second terminus of said secondary winding of said first transformer.

2. The apparatus of claim 1, wherein:

said secondary winding of said first transformer has three or more termini.

3. The apparatus of claim 1, wherein:

said secondary winding of said second transformer has three or more termini.

4. A coupling device for bypassing a switch in a power line distribution circuit, comprising:

a first transformer having a primary winding and a secondary winding;

a first inductor connected electrically in parallel with said primary winding of said first transformer, a first termination of said primary winding of said first transformer being connected to ground;

a first capacitor being connected electrically in series between a second termination of said primary winding of said first transformer and said first inductor, a first side of a power line switch being electrically connectable to said first capacitor between said first capacitor and said first inductor;

a second transformer having a primary winding and a secondary winding;

a second inductor connected electrically in parallel with said primary winding of said second transformer, a first termination of said primary winding of said second transformer being connected to ground;

a second capacitor being connected electrically in series between a second termination of said primary winding of said transformer and said second inductor, a second side of a power line switch being electrically connectable to said second capacitor between said second capacitor and said second inductor;

a first termination of said secondary winding of said first transformer being connected in electrical communication with a first termination of said secondary winding of said second transformer;

a second termination of said secondary winding of said first transformer being connected in electrical communication with a second termination of said secondary winding of said second transformer; and

a transceiver electrically connected to said first termination of said secondary winding of said first transformer and to said second transformer of said secondary winding of said first transformer.