END WINDING VIBRATION AND DEGRADATION

Case Study:
Repair of a Generator Stator with signs of
extensive end winding vibration and degradation.


ISSUE

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During a major inspection of a 55375 KVA Generator, signs of extreme winding vibration and resonance issues were apparent.

After completing a visual inspection of the end winding
support systems, the following issues were identified and documented:

  1. Extensive greasing and dusting on coil-to-coil ties, circuit ring to gunstock ties and circuit ring blocking
  2. Extensive greasing and dusting of stator bars where they exited out of the slot
  3. Broken and loose coil-to-coils ties
  4. Cracked and, in some cases, broken gunstocks
  5. Indications that circuit ring ties had cut into the insulation on the circuit rings

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