Distribution network power line communication system
First Claim
1. A distribution network power line carrier communication system including electrical power lines extending from a distribution substation to a plurality of electrical loads, comprising:
- first terminal means at the distribution substation insignal communication with the electrical power lines,said first terminal means applying an interrogation signal to the electrical power lines,and repeater means remote from the distribution substation in signal communication with the electrical power lines,said repeater means repeating said interrogation signal,said repeater means including means for receivingthe interrogation signal from the electrical power lines, delay means for delaying the interrogation signal for a predetermined time interval, means applying the delayed interrogation signal to the electrical power lines, and means preventing the repeater means from repeating said delayed interrogation signal.
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Accused Products
Abstract
A distribution network power line communication system including a central communication terminal at a distribution substation in signal communication with a plurality of remote communication terminals via the electrical distribution power lines. The central communication terminal uniquely addresses a selected remote communication terminal with an interrogation signal which requests the performance of a selected distribution automation function. The selected remote communication terminal performs the requested function and sends a response signal back to the central communication terminal. Signal amplifying repeaters are disposed in signal communication with the electrical distribution power lines, which ensure that the interrogation and response signals are at usable signal levels when they reach their intended destinations. The signal amplifying repeaters include delay devices which provide a signal delay time interval selected such that a repeater will not apply a signal to the electrical distribution power lines at the same time a signal is to be received by the repeater. In one embodiment, the message elements or bits of a signal word are spaced such that each bit of the word is delayed and transmitted by a repeater before the repeater receives the next bit of the word; and, in another embodiment the complete signal word is received by a repeater before the transmitter portion of the repeater is operated.
195 Citations
7 Claims
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1. A distribution network power line carrier communication system including electrical power lines extending from a distribution substation to a plurality of electrical loads, comprising:
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first terminal means at the distribution substation in signal communication with the electrical power lines, said first terminal means applying an interrogation signal to the electrical power lines, and repeater means remote from the distribution substation in signal communication with the electrical power lines, said repeater means repeating said interrogation signal, said repeater means including means for receiving the interrogation signal from the electrical power lines, delay means for delaying the interrogation signal for a predetermined time interval, means applying the delayed interrogation signal to the electrical power lines, and means preventing the repeater means from repeating said delayed interrogation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification