Title:
SPEED CONTROL DEVICE FOR STEAM TURBINE
Document Type and Number:
Japanese Patent JPS59122708
Kind Code:
A
Abstract:
PURPOSE:To open an unused steam valve to the full and prevent a speed variation from occurring, by installing both of a bias setter biasing a revolution command to a low value and a selector device in a speed control device being set up at each position of plural steam valves of a steam turbine which has plural steam sources. CONSTITUTION:A steam turbine 1 driving a feed water pump 14 is supplied with low and high pressure steam from a low pressure steam control valve 2 and a high pressure steam control valve. At the forestage of each of comparators 17a and 17b comparing signals out of a turbine revolution command and a revolution detector 4, those of a bias setter 16 giving a bias to the revolution command, a selector 17, adders 15a and 15b are all installed. When low pressure steam is used, a switch (a) is turned on while a switch (b) is off, and a valve 2 is opened or closed according to a deviation between the desired value and the actual revolution, while high pressure control valve 3 is given the revolution command whose value is lowered down by th bias and thereby fully opened so that a speed variation is prevented even if steam pressure in the high pressure steam source varies.
Inventors:
IIZUKA WAHEI
Application Number:
JP22851982A
Publication Date:
July 16, 1984
Filing Date:
December 29, 1982
Export Citation:
Assignee:
TOSHIBA KK
International Classes:
F01D17/00; F01D17/06; F01D17/20; F01D17/24; F01D21/14; (IPC1-7): F01D17/06
Domestic Patent References:
| JPS5929704A | 1984-02-17 |
Attorney, Agent or Firm:
Saichi Suyama
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