F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
341/95, 322/6.4
F01D 17/00 (2006.01) F01K 7/24 (2006.01) F01K 9/04 (2006.01) G05B 11/26 (2006.01) G05D 13/00 (2006.01)
Patent
CA 1188732
23 ABSTRACT OF THE DISCLOSURE A DEH (digital electrohydraulic) control system for a steam turbine generator having a steam bypass system. The turbine system includes a high pressure turbine having throttle and governor steam admission valves as well as an intermediate pressure turbine having stop and interceptor steam admission valves. The turbine is brought on line by initially controlling steam admission into the intermedi- ate pressure turbine by modulating the interceptor valve in response to a speed error signal generated as a result of the difference between actual and a predetermined reference speed. During this initial control the throttle valve remains in a closed position. When the turbine speed has attained a preset value such as half of synchron- ous speed, the interceptor valve is held at the same posi- tion it was in when the preset speed was attained and the throttle valve is controllably open in response to the same speed error signal. After a preset transfer speed has been attained, control of steam admission to the high pressure turbine is transferred to the governor valve and after synchronous speed has been reached the DEH system switches to a load control mode wherein the signal which controls the positioning of the governor valve is also utilized to control the interceptor valve position. The interceptor valve thereafter will reach a wide open posi- tion at a predetermined load. During the speed control mode of operation the control signal which controls the positioning of the 24 interceptor valve is modified by certain pressure condi- tions at the input of the interceptor valve after the preset speed is attained.
431491
Binstock Morton H.
Mccloskey Thomas H.
Podolsky Leaman B.
Oldham And Company
Westinghouse Electric Corporation
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