SAFETY ASSURANCE OF MULTIPLE REDUNDANT SYSTEMS

摘要

A system, method, and safety unit provide safety assurance for a multiple redundant system controlling a plant or complex. A unit active line (UAL) status indicates the presence of at least one redundant active unit within the system. A safety verification line (SVL) status verifies the powered down status of all redundant units not active within the system. A safety unit is associated with a vital supervision card (VSC) and vital power bus and the safety unit controls switchable connections from the vital power bus to the UAL and the SVL. Based on verification of UAL and SVL status, system control includes energizing the UAL.

主权项

1. A safety assurance system for multiple redundant safety units, the system comprising:
a unit active line (UAL); a safety verification line (SVL); and a plurality of safety units, wherein each safety unit is configured to:
control an associated vital supervision card (VSC), wherein the associated VSC is configured to energize and de-energize an associated vital power bus through a switchable connection;control a switchable connection between the associated vital control bus and the UAL;control a switchable connection between the associated vital control bus and the SVL;determine a status of the UAL; anddetermine a status of the SVL.