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System and method for operating a steam turbine with digital computer control and with improved monitoring

  • US 4,687,946 A
  • Filed: 04/26/1972
  • Issued: 08/18/1987
  • Est. Priority Date: 04/26/1972
  • Status: Expired due to Term
First Claim
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1. An electric power generating system having a steam turbine powered by a steam generator, and adapted to drive an electric generator, said system comprising:

  • a. means for digitally computing speed control signals through a startup range extending from a predetermined speed to synchronous speed, having a central processor unit and a memory interconnected with said central processing unit;

    b. means for converting input signals to digital data, and for transmitting said digital data to said digital computing means throughout said startup range;

    c. means for converting digital data to output signals, said digital to output converting means connected to said digital computing means and adapted to transmit said output signals throughout said startup range;

    d. means for sensing the magnitude of predetermined turbine operating parameters and for generating input signals representative of said parameters, said sensing means being connected to said input converting means;

    e. means for controlling the steam flow to said turbine;

    f. said output signal converting means connected to said steam flow control means;

    g. means for sensing predetermined turbine startup conditions and for connecting startup condition status signals to said digital computing means;

    h. said digital computer means being characterized in that it is programmed to compute said speed control signals as a function of at least one of said input signals for controlling said steam flow control means, and to monitor said predetermined startup condition signals and interrupt the computing of said control signals when predetermined changes of said startup conditions are monitored;

    i. said computed control signals being converted to output signals by said output converting means for controlling said steam flow control means.

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