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Control system and method for a steam turbine having a steam bypass arrangement

  • US 4,471,446 A
  • Filed: 07/12/1982
  • Issued: 09/11/1984
  • Est. Priority Date: 07/12/1982
  • Status: Expired due to Term
First Claim
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1. A control system for a steam turbinegenerator installation having a high pressure turbine, a lower pressure turbine, first valve means for controllably admitting steam to said high pressure turbine, second valve means for controllably admitting steam to said lower pressure turbine and a steam bypass arrangement for by-passing said turbines, comprising:

  • (A) means for generating a speed error signal as a function of the difference between actual and desired turbine speed;

    (B) means for initially governing said second valve means, when in bypass operation, so as to modulate the admission of steam to said lower pressure turbine in response to said speed error signal; and

    (C) means for thereafter simultaneously governing said first valve means so as to admit steam to said high pressure turbine in response to said same speed error signal, when said turbine has attained a predetermined preset speed.

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