Relay-to-relay direct communication system in an electric power system
First Claim
1. A system of communicating information over a communication line which connects at least two protective relays for an electric power line wherein communication between the two relays is in the form of successive data messages which include output status bits from one relay to the other relay, the output bits representing the result of protection functions carried out by the one relay, wherein the communication has a channel capacity which is not completely used by the output bits transmitted, the communication system of this invention comprising:
- processing means for encoding additional data from said one relay and inserting it into vacant channels in the communication between the two relays;
means for including synchronization information for said additional data on a synchronization channel in the communication, as part of the successive data messages;
means for transmitting said data messages successively on the communication line; and
processing means at the second relay for receiving and decoding the successive data messages to produce replicated output bits and the additional data transmitted from the one relay, wherein the speed and security of the additional data is approximately at least as good as that for the output bits.
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Accused Products
Abstract
The system provides communication of information between at least two protective relays serving a power system line. The communication comprises a series of successive data messages of four characters, each of which includes eight data bits, on eight data channels. The data bits include output function status bits from the transmitting relay on user selected channels, serialized analog data bits on other user selected channels, and virtual terminal data bits on still other user selected channels. A synchronization channel produces information to synchronize the transmission/receiving of the analog data and the virtual terminal data, on the basis of frames of data, each frame containing 18 messages.
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Citations
13 Claims
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1. A system of communicating information over a communication line which connects at least two protective relays for an electric power line wherein communication between the two relays is in the form of successive data messages which include output status bits from one relay to the other relay, the output bits representing the result of protection functions carried out by the one relay, wherein the communication has a channel capacity which is not completely used by the output bits transmitted, the communication system of this invention comprising:
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processing means for encoding additional data from said one relay and inserting it into vacant channels in the communication between the two relays;
means for including synchronization information for said additional data on a synchronization channel in the communication, as part of the successive data messages;
means for transmitting said data messages successively on the communication line; and
processing means at the second relay for receiving and decoding the successive data messages to produce replicated output bits and the additional data transmitted from the one relay, wherein the speed and security of the additional data is approximately at least as good as that for the output bits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification