Method and apparatus for controlled-temperature valve mode trans

Prime-mover dynamo plants – Electric control – Engine control

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60660, H02P 904

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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.

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