Prime-mover dynamo plants – Electric control – Engine control
Patent
1978-01-06
1979-12-04
Rubinson, Gene Z.
Prime-mover dynamo plants
Electric control
Engine control
60660, H02P 904
Patent
active
041773870
ABSTRACT:
An electrohydraulic control system and method are disclosed for operating valves controlling the admission of steam to a steam turbine. The system includes a mode transfer unit for effecting a transfer between a full arc mode of valve operation to a partial arc mode of operation such that the temperature of the steam turbine varies in a controlled manner, thus permitting control of turbine stresses. Apparatus is described for generating mode flow signals, combining the signals using time ratio switching such that during a mode transfer the signals vary linearly with an admission reference factor characteristic of each mode, and generating valve lift signals from a combined flow signal using multi-slope, piecewise linear approximations to the flow-lift characteristics of the full arc mode of valve operation. The system permits mode transfers wherein total steam flow is held substantially constant and first stage turbine temperature is caused to vary linearly with admission reference factor.
REFERENCES:
patent: 3403892 (1968-10-01), Eggenberger et al.
patent: 3637319 (1972-01-01), Stratton et al.
patent: 3740588 (1973-06-01), Stratton et al.
patent: 3956897 (1976-05-01), Zitelli et al.
patent: 3981608 (1976-09-01), Sato et al.
patent: 4056331 (1977-11-01), Sato
1970 Thesis, "Admission Control of Steam Turbines", by R. J. Dickenson.
Ahern John F.
Austin Ormand R.
General Electric Company
Ginsburg Morris
Mitchell James W.
LandOfFree
Method and apparatus for controlled-temperature valve mode trans does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for controlled-temperature valve mode trans, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for controlled-temperature valve mode trans will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-92593