F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
342/14, 60/51, 3
F01D 17/06 (2006.01) F01D 17/24 (2006.01) F01D 19/00 (2006.01)
Patent
CA 1135814
53 48,252 ABSTRACT OF THE DISCLOSURE A turbine speed control system comprising a pair of concurrently operable electronic microprocessor-based controllers which are coupled together by a data link to functionally cooperate in controlling turbine acceleration primarily during start-up operations in accordance with a set of predetermined measured and calculated turbine condi- tions. One controller is operative to control the speed of the turbine at selected accelerations from turning gear to a predetermined speed value. This same controller monitors a plurality of temperature differences from preselected regions of the turbine and inhibits turbine acceleration in accordance with an out-of-limit temperature condition associated therewith. In addition, the one controller is further operative to selectively override the turbine speed hold initiated by an out-of-limit temperature condition, the override permitting the one controller to proceed with controlling the speed of the turbine at a desired accelera- tion. The other controller is selectively operative to govern the turbine acceleration as controlled by the one controller based on calculated present and anticipated rotor stresses which are derived concurrently with the speed control operations of the one controller. (2) 54 48,252 A turbine speed hold may be initiated by either a detected differential temperature out-of-limit condition or a detec- ted calculated rotor stress limit condition. In either case, the one controller is further operative to detect if the speed hold occurs in one of a number of predetermined critical speed zones and to adjust the turbine speed out- side of the zone in which the speed hold occurs.
335395
Heltsley Alan T.
Zitelli William E.
Mcconnell And Fox
Westinghouse Electric Corporation
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