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Project Scope

The NCSHEH facility had ageing HV infrastructure that did not comply with prevailing standards for safely switching high voltage circuits, which imposed the burden of wider site outages during high voltage switching operations. Partum was engaged for the basis of design, detailed design and preparation of the equipment specifications for the upgrade of several key end-of life substations within the facility, including:

 

  • Main HV incoming substation.
  • Ring main units and stepdown substations.
  • Relocation of the administration emergency generators to centralised location.

Challenges Overcome

  • Upgrading the brown-field site with restriction in equipment location and underground services.
  • Limited information on existing underground cable locations, terminations and earthing systems.
  • The site supply frequency was 60Hz, though there was a mix of 60 and 50Hz loads.
  • New earthing designs in keeping with existing philosophies.
  • Protection grading/discrimination with downstream protection devices while reducing size of source transformers.
  • Limited site load data to validate equipment sizes.

Solution

  • Reverse engineering of the existing infrastructure.
  • Substation design including interfacing with existing equipment and cables.
  • Utilising standard power transformers capable of operating on both 60 and 50 Hz.
  • Complete power systems modelling using SKM Powertools.
  • Complete earthing and lightning system modelling using CDEGS and SESHIELD 3D respectively.
  • Control system design for remote operation and battery backup.

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