What is use of 2/3 logic in our plant?

What is use of 2/3 logic in our plant? 
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1 Answer

Answer :

All our protection instruments (system) are triplicated to have following uses.

a. To increase system integrity.

b. To decrease faulty trips.

c. Maintenance can be done on one protective instrument without shutting down the whole system. 

We don’t want our plant (reactor) to trip just because one instrument failed. So we have triplication (2/3 logics) in protection instruments. The trip signal will pass if only two out of three switches operate. Of only one operates there will be no trip. This logic is used to trip the reactor in our plant. 
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