| 摘要 |
PURPOSE:To continue the FCB operation of a steam turbine with its thorough protection by reopening a control valve while watching various steam conditions and the conditions of a steam turbine main body at the time of its load shutdown or the FCB operation. CONSTITUTION:A high pressure steam governing valve HPCV and a low pressure steam governing valve LPCV are totally closed by a FCB signal. The LPCV is slightly opened to a cooling opening after it is checked for (B) time, generated LP steam quantity, and steam conditions when the FCB signal has ceased. When the conditions of a starting command, a mismatch, and high pressure steam have been secured for the steam turbine during its cooling operation, the HPCV is fully opened. Thus, a steam turbine can continue its FCB operation under thorough protection.
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