Thermodynamics Lecture 34: Combined Cycles

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I have a combined cycle 2 Gas turbine(2GT) and 1 Steam turbine(ST) if transformer 500KV for ST in the service and when enter any transformer for any GT in the service we find the transformer for ST to be out of service (trip) by signal vibration at bearing 6, 5, 4 for the turbine .
Note: the signal of the vibration not high but the signal reach to the zero value for 29second and back again to the normal value.
Why the vibration of steam turbine reach to zero value for 29 sec and back again to normal value?

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