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

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Question added by imran ali siddiquei , Manager , Adhunik Power & Natural Resources Ltd
Date Posted: 2014/09/29
Meenakshisundaram Thangarajan
by 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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