System of communicating output function status indications between two or more power system protective relays
First Claim
1. A system for communicating the status of output bits from one protective relay to a second protective relay in a power system, wherein the relay output bits are the result of a fault determination calculation process in the one relay which would conventionally be used to set output contacts present in said one relay, the status of which is communicated to the second relay, comprising:
- means at the one relay for formatting said output bits, which are representative of the result of the fault determination calculation process, into a data packet;
means for directly transmitting said data packet over a communications link to said second relay, such that the results of the fault determination calculation process in said first relay, in the form of output bits, is communicated to the second relay without the use of output contacts in the first relay; and
means at the second relay for receiving said data packet, verifying the validity of said data packet, obtaining the transmitted output bits from said data packet and then utilizing said obtained output bits as input bits in its own fault determination calculation process.
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Reexamination
Accused Products
Abstract
The communication system includes transmitting output status bits indicative of a function of the relay directly from one microprocessor-based protective relay in a power system to a second companion microprocessor-based relay. Each relay has transmit and receive modules connected by a communications link, with the transmit and receive modules using the logic output and input bits produced by the respective relays in their respective relay calculations.
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Citations
7 Claims
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1. A system for communicating the status of output bits from one protective relay to a second protective relay in a power system, wherein the relay output bits are the result of a fault determination calculation process in the one relay which would conventionally be used to set output contacts present in said one relay, the status of which is communicated to the second relay, comprising:
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means at the one relay for formatting said output bits, which are representative of the result of the fault determination calculation process, into a data packet; means for directly transmitting said data packet over a communications link to said second relay, such that the results of the fault determination calculation process in said first relay, in the form of output bits, is communicated to the second relay without the use of output contacts in the first relay; and means at the second relay for receiving said data packet, verifying the validity of said data packet, obtaining the transmitted output bits from said data packet and then utilizing said obtained output bits as input bits in its own fault determination calculation process. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification