Case Study: A Complex Repair on an Aged 6.6kV Hydro Generator 1

A COMPLEX REPAIR ON AN AGED 6.60kV HYDRO GENERATOR

Sidewinders’ case studies help you understand the performance, quality and value of our services.


ISSUE

During recent annual maintenance of a vertical hydro generator, a stator coil was damaged as the rotor was being removed by the client.   Damage to the coil was extensive, with bare copper exposed where it had been hit.

Due to the utility company going through a large transition period, Sidewinders’ was unable to visually check the damage and complete electrical testing until the unit was completely reassembled—only four days away from its scheduled startup date.

In cases like this, the utility company generally has several options for a repair based on the outcome of the visual inspections, electrical testing and whether or not spare coils are available. The available options are:

  1. Localized repair of the damaged area
  2. Cutting and removing the coil from the circuit
  3. Half coil splice
  4. Rewind

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