CONTROL SYSTEM FOR STEAM TURBINE HEATING-STEAM EXTRACTION STAGES Russian patent published in 1995 - IPC

FIELD: steam turbines. SUBSTANCE: control system has servomotors 1 and 2 for high- and low-pressure sections, respectively, connected to speed governor 3 and steam extraction regulator 4, stop valve servomotor 5 connected to slide valve 7 of automatic safety device 6, extraction pressure safety and control device 14. The latter is essentially pressure relay 15 with first-limit setting for steam extraction regulator 4 and speed governor 3 connected to setting devices 12 and 11, respectively, through logical unit 23 and three-position switch 19, as well as pressure relay 16 in extraction stages with second higher-level setting connected to slide valves 7 of automatic safety device 6. EFFECT: improved design. 2 dwg