Why does the steam turbine have to go through at least 24 hours of turning before it can hang up?

Turning is to protect the big shaft and prevent it from bending. Turn the car for at least three hours before driving. This is to move the big shaft, repair the slight deformation of the big shaft, check the state of the unit, and at the same time turn the car better to prevent dry friction and reverse rotation. The temperature of the main steam needs to be at least 50 degrees higher than that of the regulating stage. This is to ensure that the steam will not condense sharply after entering the cylinder, to protect the cylinder and the heater, and to prevent the cylinder from cold shrinkage deformation and water impact. The degree of superheat is greater than 50 degrees to protect the cylinder and prevent the cylinder from being damaged by water carried by steam.