Process protection system
First Claim
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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Accused Products
Abstract
A protection system for a complex process has four redundant protection sets, each of which produces partial reactor trip and partial safeguard actuation signals in pairs of microprocessor-based controllers. Two independent and redundant voting logic trains are provided for the partial reactor trip signals, and two identical, independent and redundant voting logic trains are provided for the partial safeguard actuation signals. Each of the trains includes a pair of redundant microprocessor-based voting logic controllers, each of which receives the partial reactor trip or partial safeguard actuation signals from each of the process protection sets and has a voting processor which generates an intermediate reactor trip or intermediate safeguard actuation signal in response to partial signals from a predetermined number of protection sets. The intermediate signals from the two voting logic controllers in each train are ANDed to generate train signals. The reactor trip train signals are then ORed to generate a reactor trip signal. Each of the train safeguard actuation signals activates a separate set of redundant components.
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Citations
7 Claims
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1. A process protection system for a complex process comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification