GAS TURBINE, DRIVING METHOD THEREOF AND GAS TURBINE COMBINEDELECTRIC POWER GENERATION PLANT

摘要

A steam temperature Ts and a casing air temperature Ta are measured by thermometers. The measurement results are taken into measuring devices and converted into electric signals. The electric signal is A/D converted by the measuring device and then, is sent to a control apparatus where a difference between both the temperature is calculated by a subtracter of a processor provided in the control apparatus. When an absolute value .DELTA.T = ~Ta - Ts~ of this difference is contained within 10.degree.C continuously ten times, a control signal is sent from a computing unit to a controller which is the control section, a pressure adjusting valve and the like are controlled and a cooling medium is switched to steam.