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Project Scope

As part of the new Fortescue Iron Bridge mine, Partum was engaged in the design of the 33kV overhead distribution
network interconnecting the following:

  • Mine Ore Processing Plant.
  • Non‐process facilities including ANFO, Heavy vehicle refuelling and maintenance.
  • Radio Base Station.
  • Japal Village.

The project comprised of approximately 9 km of a lemon phase conductor along with 48 and 72‐core single mode
OPGW conductors throughout the various areas of supply.

Challenges Overcome

  • Adverse terrain across the site.
  • Greenfield mine development causing multiple changes to powerline design mid‐way of the project.
  • Difficulty obtaining site information.
  • Multiple changes in the termination points at the Village and Crusher B.
  • Multi‐disciplines working in parallel site wide with an evolving mine master plan.
  • High 3‐phase fault levels (>20 kA), due to parallel transformers and relatively short line lengths.
  • Under‐rated equipment and line proposed at initial design stage (by Others).

Solution

  • Previous experience utilised in the realignment of the powerlines.
  • Removal of under‐rated reclosers from line design and alternate air break switches recommended, capable of meeting fault levels.
  • Protection settings adjusted to suitably protect overhead line and equipment.
  • Power systems options analysis to assess different equipment for fault ratings to provide optimal cost‐based solution.
  • Complete preparation of the power and earthing system modelling as part of the HV submission deliverable.

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