Overspeed protection control arrangement for a steam turbine generator control system

Patent · Sat Jun 06 04:00:00 EDT 1987

OSTI ID:6945348

Hwang, E Y; Shung, W S

An improved OPC arrangement is described for a turbine control system having at least one controller in two-way digital data communications with motive fluid admission valve control circuits for controlling motive fluid admission to the turbine, comprising: (A) at least three OPC circuits each including programmable digital computer means in two-way digital data communication with the controller; (B) at least three speed transducers positioned to derive respective output signals indicative of turbine shaft rotational speed; (C) each of the OPC circuit including circuit means operable to convert a respective one of the speed transducer output signals to a pulse waveform of a frequency greater than the frequency of the received speed transducer output signal; (D) means for counting the pulses of the waveform and for sampling the count in repetitive predetermined periods of time for transfer to the digital computer means; (E) the digital computer means being operable to calculate turbine speed and provide a turbine speed signal (RPM), in response to the counts transferred to it; (F) means for providing the turbine speed signal to the other OPCs, as well as the central controller; (G) the digital computer means being responsive to RPM signals received from other OPCs to validate its own RPM signal if it is in agreement with a predetermined number of other received RPM signals.

• Assignee: Westinghouse Electric Corp., Pittsburgh, PA
• Patent Number(s): US 4635209
• OSTI ID: 6945348
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
BOILERS
COMMUNICATIONS
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DATA TRANSMISSION
DIGITAL COMPUTERS
ELECTRIC GENERATORS
ELECTRONIC CIRCUITS
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
MACHINE PARTS
MOTION
PULSES
ROTATION
SHAFTS
SIGNALS
SPEED REGULATORS
STEAM GENERATORS
TIMING CIRCUITS
TURBOGENERATORS
VALVES
VAPOR GENERATORS
WAVE FORMS