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System and method for aligning data between local and remote sources thereof

  • US 7,231,003 B2
  • Filed: 06/29/2001
  • Issued: 06/12/2007
  • Est. Priority Date: 04/05/2001
  • Status: Expired due to Term
First Claim
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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:

  • 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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