Delayed ramping in the primary control system or local maintenan

Details Delayed ramping in the primary control system or local maintenan Delayed ramping in the primary control system or local maintenan

1975-02-19

1977-03-01

Gordon, Clarence R.

Power plants

Combustion products used as motive fluid

60 3928R, 60 3914, F02C 908

Patent

active

040095673

ABSTRACT:
A predetermined time delay of speed setpoint ramping of a gas turbine is imposed at ignition in its primary control system or local maintenance controller in order to compensate for the fixed energy input at ignition which might otherwise greatly increase the possibility of flameout. The imposed time delay results in the increase of an initial turbine speed tracking mode time period for the duration of the time delay.
During the time delay period, fuel flow is maintained at a fixed fuel valve setting and pressure. At the termination of the time delay period, ramping of a speed setpoint at a selected rate is begun and the turbine speed is thereby increased towards synchronization speed whereat synchronization is effected.

REFERENCES:
patent: 3382671 (1968-05-01), Ehni
patent: 3421317 (1969-01-01), Bedford
patent: 3422619 (1969-01-01), Hendricks
patent: 3469395 (1969-09-01), Spitsbergen
patent: 3520133 (1970-07-01), Loft
patent: 3691759 (1972-09-01), Scheerer
patent: 3729929 (1973-05-01), Kiscaden
patent: 3834361 (1974-09-01), Keely

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