Patent ID: 6049578
Filing Date: 2000-04-11
Classification: G05B,G21D,Y02E

Abstract:
A digital plant protection system for use in nuclear power plants, comprising:a plurality of substantially identical independent sensed-parameter processing channels, each of which accepts a digital value representative of a sensed-parameter;a digital comparator associated with each sensed-parameter processing channel for (1) comparing said digital value of the sensed-parameter with a first predetermined digital value indicative of a pre-trip condition and generating a pre-trip output if said pre-trip condition is detected, and (2) further comparing said digital value of the sensed-parameter with a second predetermined digital value indicative of a trip condition and generating a trip output if said trip condition is detected; anda coincidence logic processor associated with each said sensed-parameter processing channel for receiving said trip output from said digital comparator, each said coincidence logic processor being cross-connected to every sensed-parameter processing channel for receiving several trip outputs from digital comparators within each said channel, wherein said coincidence logic processor generates a trip signal for effecting remedial action upon receipt of trip outputs from at least two channels.