Prime-mover dynamo plants – Electric control – Engine control
Patent
1974-11-11
1976-12-28
Schaefer, Robert K.
Prime-mover dynamo plants
Electric control
Engine control
317 21, 60646, F01K 1302
Patent
active
039997871
ABSTRACT:
As an improved way of effecting fast valving of turbines of power system steam-electric installations of types that incorporate by-pass systems for by-passing steam from a point ahead of the high pressure turbine either directly to the condenser or to the cold reheat line, and in the latter case also from the hot reheat line to the condenser, and where the purpose of employment of fast valving is to improve the stability of power transmission over transmission circuits to which the generators of the installations in question make connection, when stability is threatened by line faults and certain other stability endangering events, the approach of rapidly closing intercept valves at fastest available closing speed in response to a fast valving signal, is supplemented by bringing into effect preprogrammed processes of control valve repositioning, plus intercept valve reopening, so effected as to cause turbine driving power subsequent to generator rotor first forward swing to hold below a preset value that is less than the driving power that applied prior to the event that brought about development of the signal.
When high pressure by-pass valves discharge steam directly to the condenser, and there is a need to protect the reheater from overheating preprogrammed provision is made for runback of rate of steam production within the steam generator to a value that will cause termination of the discharge of steam through the said high pressure by-pass valves that will at first take place, with provision so that said runback is effected rapidly enough to avoid damage to the reheater.
REFERENCES:
patent: 3421014 (1969-01-01), Moorganov
patent: 3657552 (1972-04-01), Park
patent: 3849666 (1974-11-01), Park
Fast Load Control Inc.
Redman John W.
Schaefer Robert K.
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