Power line carrier communication system for signaling customer locations through ground wire conductors
First Claim
1. A power line communication system for conveying carrier current signals between two locations in an electrical power system including a distribution transformer, comprising:
- a first ground wire which connects an uninterrupted neutral conductor of the power system directly to real earth ground at a first of the two locations;
means including a first current transformer having a single turn primary formed by said first ground wire for inducing a first current signal in said first ground wire in response to first communication signals;
a second ground wire which connects said neutral conductor of the power system directly to real earth ground at the second of the two locations; and
means including a second current transformer having a single turn primary formed by said second ground wire for detecting a second current signal in the second ground wire which is responsive to the first current signal.
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Accused Products
Abstract
Carrier current signals are impressed to and detected from grounding conductors connected to the power system and to real earth ground. The communication links provided by the grounded neutral conductors of the power system and by the real earth ground return path transmit the carrier communication signals between a substation communication terminal and remote communication terminals at the premises of utility company customers. The communication signals are coupled to the ground conductors by transformer-type couplers in which the grounding conductor constitutes one winding of the transformer.
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Citations
9 Claims
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1. A power line communication system for conveying carrier current signals between two locations in an electrical power system including a distribution transformer, comprising:
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a first ground wire which connects an uninterrupted neutral conductor of the power system directly to real earth ground at a first of the two locations; means including a first current transformer having a single turn primary formed by said first ground wire for inducing a first current signal in said first ground wire in response to first communication signals; a second ground wire which connects said neutral conductor of the power system directly to real earth ground at the second of the two locations; and means including a second current transformer having a single turn primary formed by said second ground wire for detecting a second current signal in the second ground wire which is responsive to the first current signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification