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What is differential expansion of steam turbine? Why we need to measure key phasor?

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Question ajoutée par imran ali siddiquei , Manager , Adhunik Power & Natural Resources Ltd
Date de publication: 2014/09/29
Meenakshisundaram Thangarajan
par Meenakshisundaram Thangarajan , Senior Operation & Maintenance Engineer , Arabian Bemco Contracting Company Ltd, Qurayyah Combined cycle power plant

It is the difference between change in shaft lent and change in casing length. Differential expansion occurs due to high differential temperature of Turbine shaft and casing. 

Key phasor is used to find the phase angle of unbalanced mass for dynamic balancing.

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