Westinghouse Electric Corporation

Paul J Tyler

Kermit R Wescott

William L McCarty

Leo P St Onge

Method and apparatus for detecting load rejection in a combustion turbine, wherein a speed signal representative of the turbine speed and a load signal representative of the turbine load are provided. The invention includes referencing devices for generating a delta speed reference signal and a delta load reference signal, derivative devices for determining the derivative of the speed signal and the load signal, comparators for comparing the speed derivative to the delta speed reference signal and for comparing the load derivative to the delta load reference signal and an indicator for indicating the occurrence of two events, namely, the first comparator determines that the speed derivative exceeds the delta speed reference signal and the second comparator determines that the load derivative exceeds the delta load reference signal. In one embodiment a maximum turbine speed reference signal is provided and a third comparator compares the speed signal to the maximum turbine speed reference signal. In that embodiment the indicator provides a second indication on the occurrence of the first two events together with a third event, namely, a determination by the third comparator that the speed signal exceeds the maximum turbine speed signal. In a preferred embodiment of the invention, first and second rate monitors are provided for monitoring the rate of change of the speed signal and the load signal and for generating indications when the rate of change of the speed signal and the load signal exceeds predetermined rate of change limits.

Method and apparatus for downline load rejection sensing in a gas

Method and apparatus for diagnosing ignition failure conditions in a combustion turbine are shown to generally include referencing members for generating a plurality of reference signals, wherein each of the reference signals are representative of a desired ignition operating condition, sensors for sensing actual ignition operating conditions each of which correspond to a desired ignition operating condition. The sensors generate a plurality of operating signals representative of actual ignition operating conditions. Comparators are utilized for comparing each of the operating signals to a corresponding reference signal and to indicate when the operating signal exceeds the reference signal in the presence of an ignition enabling signal.

Apparatus for ignition diagnosis in a combustion turbine

Method and apparatus for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, is shown to include a fuel flow regulator for regulating the flow of fuel in response to a control signal, a controller for generating a control signal representative of the difference between the actual speed signal and the speed reference signal, a first adjustment member for modifying the speed reference signal to account for droop prior to generation of the control signal, and a second adjustment means for modifying the speed reference signal to account for speed error also prior to generating the control signal. A load condition specifically envisioned for use with the present invention is the point of closure of the generator breaker.

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Winter Springs, FL, United States of America

Paul J Tyler