System and method for aligning data between local and remote sources thereof
First Claim
1. A first relay for performing current differential protection of a protected apparatus, the current differential protection utilizing a first and a second communication channel transmitting data between a second relay and the first relay, the first and second relays operating on respective portions of a power line of an electrical power system, the first relay comprising:
- a local sample circuit configured to generate a local stream in response to receipt of an electrical current signal from a local power line portion;
a first processing circuit operatively coupled to the local sample circuit and the first communication channel, the first processing circuit configured to align, filter and compare the local stream and a first remote stream from the second relay to generate a first logic value, and to determine a first channel status based on the first remote stream;
a second processing circuit operatively coupled to the local sample circuit and the second communication channel, the second processing circuit configured to align, filter and compare the local stream and a second remote stream from the second relay to generate a second logic value, and to determine a second channel status based on the second remote stream; and
a selection logic circuit operatively coupled to the first and second processing circuits, the selection logic circuit configured to determine a control signal based on the first channel status and the second channel status, the control signal applied to an output contact of the first relay.
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Accused Products
Abstract
The communication system includes two communication channels for communication of protection and control information between two protective relays on a power line portion of an electric power system. A switch provided at the receiving relay connects one communication channel and provides a connecting link between the communication channel and the receiving relay. The transmitted data is applied on both communication channels and processed substantially identically. When the one communication channel is indicated to be faulty, the switch in the receiving relay is operated to connect the second communication channel, thereby substantially preventing delay in the receipt of the data from the transmitting relay.
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Citations
10 Claims
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1. A first relay for performing current differential protection of a protected apparatus, the current differential protection utilizing a first and a second communication channel transmitting data between a second relay and the first relay, the first and second relays operating on respective portions of a power line of an electrical power system, the first relay comprising:
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a local sample circuit configured to generate a local stream in response to receipt of an electrical current signal from a local power line portion; a first processing circuit operatively coupled to the local sample circuit and the first communication channel, the first processing circuit configured to align, filter and compare the local stream and a first remote stream from the second relay to generate a first logic value, and to determine a first channel status based on the first remote stream; a second processing circuit operatively coupled to the local sample circuit and the second communication channel, the second processing circuit configured to align, filter and compare the local stream and a second remote stream from the second relay to generate a second logic value, and to determine a second channel status based on the second remote stream; and a selection logic circuit operatively coupled to the first and second processing circuits, the selection logic circuit configured to determine a control signal based on the first channel status and the second channel status, the control signal applied to an output contact of the first relay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification