Distribution network power line communication system
First Claim
1. A polyphase, power frequency, distribution network power line carrier communication system, comprising:
- a plurality of distribution network power line conductors to which a carrier signal is to be coupled,means providing a carrier signal having a frequency substantially higher than power frequency,means coupling said carrier signal to each of said conductors to provide a predetermined proportional relationship between the carrier signals of said conductors,and impedance elements connected between said conductors remote from the signal coupling point, said impedance elements being devoid of connection to said means providing the carrier signal, other than through said distribution network power line conductors, said impedance elements being selected to present a high impedance to power frequency and substantially lower impedances to the frequency of the carrier signal, said impedance elements also being selected to re-establish said predetermined proportional relationship between the carrier signals of said conductors.
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Accused Products
Abstract
A distribution network power line communication system which includes coupling means for applying a carrier current communication signal to the polyphase primary distribution conductors with a proportional relationship between the signal voltages applied to the various conductors selected to provide a predetermined propagation mode. Impedance elements are connected between the conductors at selected points remote from the coupling point, such as at the location of unbalanced loads, line taps, branches, capacitor banks, distribution transformers, and other line discontinuities which may cause mode conversion. The impedance elements are selected and connected to re-establish the predetermined propagation mode.
59 Citations
18 Claims
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1. A polyphase, power frequency, distribution network power line carrier communication system, comprising:
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a plurality of distribution network power line conductors to which a carrier signal is to be coupled, means providing a carrier signal having a frequency substantially higher than power frequency, means coupling said carrier signal to each of said conductors to provide a predetermined proportional relationship between the carrier signals of said conductors, and impedance elements connected between said conductors remote from the signal coupling point, said impedance elements being devoid of connection to said means providing the carrier signal, other than through said distribution network power line conductors, said impedance elements being selected to present a high impedance to power frequency and substantially lower impedances to the frequency of the carrier signal, said impedance elements also being selected to re-establish said predetermined proportional relationship between the carrier signals of said conductors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification