초록 ▼

In a steam turbine control system three overspeed protection circuits (OPC) are provided, each one being identical to the others and each having a programmable digital computer in two-way data communication with a master controller, as well as with the other OPCs. Speed transducers adjacent the turb

In a steam turbine control system three overspeed protection circuits (OPC) are provided, each one being identical to the others and each having a programmable digital computer in two-way data communication with a master controller, as well as with the other OPCs. Speed transducers adjacent the turbine shaft provide speed indicative signals to the respective OPCs which calculate extremely precise RPM values utilizing an adaptive filter in the derivation process.

대표청구항 ▼

An improved OPC arrangement for a turbine control system having at least one central controller in two-way digital data communication with a plurality of motive fluid admission valve control circuits for controlling motive fluid admission to the turbine, comprising: (A) at least three OPC circuits e

An improved OPC arrangement for a turbine control system having at least one central controller in two-way digital data communication with a plurality of 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 said controller; (B) at least three speed transducers positioned to derive respective output signals indicative of turbine shaft rotational speed; (C) each of said OPC circuit including circuit means operable to convert a respective one of said 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 said waveform and for sampling the count in repetitive predetermined periods of time for transfer to said digital computer means; (E) said digital computer means being operable to calculate turbine speed and provide a turbine speed signal (RPM), in response to said counts transferred to it; (F) means for providing said turbine speed signal to said other OPCs, as well as said central controller; (G) said 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.