Loose Blocking Revealed by Endwinding Vibration Monitoring Company: Central Canada Utility Machine Description: Air-cooled Generator, 287.66 MVA, 21kV, 2-pole Loose Blocking Revealed by Endwinding Vibration Monitoring In June of 2012, an offline test was completed on a 21 kV air cooled turbine generator. The impact data showed no critical natural frequencies near 120Hz. In order to monitoring for future increases in end winding vibration over the offline baseline, Iris Power fiber optic endwinding vibration accelerometers were installed for periodic online monitoring. Two years later in August 2014, periodic online measurement of endwinding vibration showed a step change in vibration that exceeded typical alert levels of 250µm or 10mils pk-pk based on IEEE 1129 guidelines.Continuous Onli

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