| 摘要 |
PURPOSE:To improve the accuracy of stress control for a rotor by calculating the temperature of the rotor etc. on saturated steam temperature converted from steam pressure in the case of wet steam to determine thermal stress in the rotor. CONSTITUTION:A pressure signal delivered from a pressure detector 8 after the first high pressure stage is converted into saturated steam temperature by means of a converter 20. A steam temperature selector 22 judges whether the steam is wet or not by a signal delivered from a wetness detector 21, and then outputs a saturated temperature signal delivered from the converter 20 in the case of wet steam, and a signal delivered from a temperature detector 26 after the first high pressure stage in the case of dry steam. The steam temperature signal delivered from the selector 22 is inputted with a signal delivered from the pressure detector 8 through a T computing element 9 in a rotor thermal stress detecttor 10 to calculate the rotor thermal stress. Therefore the rotor thermal stress can be accurately determined regardless of the steam wetness.
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