| 摘要 |
PURPOSE:To improve the controllability of lubricant temperature by calculating the amount of the generated heat from the inlet and outlet temperatures of the bearing lubricant so that the function of thus calculated amount of generated heat is used to vary the control target value until it reaches the final value and also by setting the lowest limit to the rate of change for the control target value. CONSTITUTION:Lubricant temperature toin and toon are detected respectively by bearing inlet temperature detector 1 and bearing outlet temperature detector 2, the temperature difference DELTAton is calculated by subtractor 3, and the rate of change in the amount of generated heat DELTAQ0 by the rate of change detector 4. If a turbine is tripped during operation, the and gate 22 is turned off and the signal switches 11, 15 and 18 switch the contact connections from c a to c h to lower the control target value. At this time the operating condition is detected by the changing condition detector 23 and the output of the integrator 12 is temporarily forced to drop from the maximum value to the control target value. |
