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Process protection system

  • US 6,532,550 B1
  • Filed: 02/10/2000
  • Issued: 03/11/2003
  • Est. Priority Date: 02/10/2000
  • Status: Expired due to Term
First Claim
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1. A process protection system for a complex process comprising:

  • a plurality of redundant process protection sets, each independently computing partial protection signals;

    a voting logic system having two independent and redundant logic trains, each logic train having a pair of redundant microprocessor based voting logic controllers, each voting logic controller of each logic train receiving said partial protection signals from each said process protection set and having a voting processor which generates an intermediate protection signal in response to partial protection signals, from a selected number of said protection sets;

    logic associated with each logic train generating a train protection signal only when each voting processor in the train generates an intermediate protection signal; and

    an output device producing a protection output in response to a train protection signal from either of said logic trains.

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