PROJECT SCOPE
It was Horizon Power’s intention to replace the majority of the line infrastructure due to the assets reaching its end of useful life. Approximately 5.6km of KRT-DMP 81 was replaced in 2012 as part of the Gap Ridge development and was to remain as is.
Partum was engaged to undertake the design for:
- 13.4km of 132kV powerline.
- New overhead fibre (OPGW) for the entire line length.
- Earthworks design for construction pads along a 3km tidal salt flat section.
- 650m of underground and two cable termination structures due to vicinity to airport.
- Landing span and gantry at the existing Dampier substation.
SOLUTION
- Extensive PLS CADD modelling to confirm phase and ground clearances including the new OPGW in the existing section.
- 3D modelling of the cable termination structures to confirm no infringement on CASA zone.
- Refining the foundation types and designs against preliminary geotechnical data and on-site ID drilling.
- Optimisation of the earthworks construction pads in challenging tidal terrain.
- Detailed insulation coordination assessment for the surge arrestor selection.
- Assessing the current ratings, costs, and practicalities for several cable installation arrangements.
- CDEGS modelling for the powerline earthing and lightning and confirm voltages on 3rd party assets.