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A negative differential expansion appear under what circumstances?

Because the cylinder and the rotor steel differ, linear expansion coefficient generally larger than the linear expansion coefficient of the rotor cylinder, and a small rotor mass and large heating, the unit during normal operation, differential expansion are positive.

When the load drops or load rejection, the main steam temperature and reheat steam temperature drop, the impact of water turbine; when steam heater used improperly unit start and stop both make a negative differential expansion.