Ripple Spring Wedging Ageing in Hydro Units

Published Jul 13th, 2023 IRMC 2023 - Jean-Louis Drommi

Slot wedge : What is the purpose

  • Stator windings , located in slots
    – 2 bars per slots : current inter action
  • Radial wedge
    – Also lateral wedge
  • Slot wedge prevents stator bar radial movement
    – Current ∧  M agnetic field = Force
  • In case of same phases in a slot :
    – no outward force
  • In case of different phases in a slot:
    – pulsating force inward and outward
    – Must withstand short circuit forces

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