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Projects Alexandra Substation extension

In late 2019, Connetics extended the Alexandra substation with the installation of a 5MVA transformer. This extension was of high importance, as this new transformer is a critical spare that will be utilised throughout Central Otago to support the growing community.

The installation of the transformer involved:

  • earth grid installation to cover the new area
  • repairs to the existing grid
  • foundations for all of the equipment
  • 33kV bus extension
  • 33kV ABS disconnector installation
  • overhead structure for a mobile substation to be connected to if required
  • all associated 33kv cables
  • 33kV circuit breaker installation and testing
  • 11kV cable installation
  • 11kV RMU installation and cut into existing 11kV supply
  • replacement of existing underground cable with new cable from RMU to overhead pole connection point
  • SEL relay and communication commissioning
  • new security fence installation
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