Generator stator windings outside of the stator core are referred to as the end-winding. The end-winding is at high-voltage and requires support against mechanical vibration driven by magnetic and mechanical forces. Machine endwindings are designed so that under normal circumstances these vibrations are controlled enough to prevent significant movement. However, the endwinding support system can deteriorate due to:
End-winding vibration can lead to cracking of the coil/bar insulation just outside of the stator slot and, in severe cases, may cause the copper conductors to fatigue crack leading to high arcing currents. Eventually, any of these issues can lead to stator winding ground faults.
End-winding vibration monitoring using fiber optic accelerometers provides a means to warn operators when dangerous vibration levels begin to occur.Request More Information
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Articles, Technical Papers, & Case Studies
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 ...