Yufeng Power: A modern enterprise specializing in the production of high-power, medium- and low-speed diesel engines and low-power steam turbines.
18
2019
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04
Why is expansion differential protection provided for steam turbines?
During turbine startup, shutdown, and abnormal operating conditions, the rotor often heats up (or cools down) faster than the cylinder, resulting in a differential expansion—commonly referred to as "expansion difference." Whether the expansion difference is positive or negative, once it reaches a certain threshold, the axial stationary and rotating parts of the turbine will come into contact and start rubbing against each other. To prevent excessive expansion differences from causing friction between stationary and rotating components, large-scale units are typically equipped with expansion-difference protection devices. When the positive or negative expansion difference reaches a predetermined value, the protection system will activate, closing the main steam valve and the regulating steam valve to initiate an emergency shutdown.
During turbine startup, shutdown, and abnormal operating conditions, the rotor often heats up (or cools down) faster than the cylinder, resulting in a differential expansion—commonly referred to as "expansion difference." Whether the expansion difference is positive or negative, once it reaches a certain threshold, the axial stationary and rotating parts of the turbine will come into contact and start rubbing against each other. To prevent excessive expansion differences from causing friction between stationary and rotating components, large-scale units are typically equipped with expansion-difference protection devices. When the positive or negative expansion difference reaches a specified value, the protection system will activate, closing the main steam valve and the regulating steam valve to initiate an emergency shutdown.
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Yufeng Power: A modern enterprise specializing in the production of high-power, medium- and low-speed diesel engines and low-power steam turbines.
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