John hollandJohn Holland

A significant upgrade to NW Tasmania’s power grid.

Palmerston to George Town High Voltage Transmission Lines

The Palmerston - Hadspen - George Town optical ground wire installation project involved upgrading 85 kilometres of existing 220kV transmission line infrastructure between Palmerston and George Town in Tasmania.

The project extended over 100 road crossings, eight major highway crossings, four rail line crossings and eight river crossings, including the Tamar River alongside the Batman Bridge. Works were also carried out over the Cataract Gorge, Batman Bridge and through the Trevallyn Nature Reserve.

The project scope included tower strengthening (installation of new steel), assembly and helicopter installation of new earth peaks and stringing new Optical Ground Wire (OPGW). The 85- kilometre line included 243 tower structures and three substations. Most works were conducted under live conditions with only a select few stringing pulls conducted under outage conditions.

  • Customer
    Transend Networks Pty Ltd
  • Location
    Launceston, Tasmania
  • Specialisation
    Transmission lines & substations
  • Start
    September 2012
  • End
    March 2014
The project was completed three months ahead of schedule, despite several engineering, extreme wet weather and project management challenges.
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Our team developed of a number of innovations, including a bespoke tower foundation upgrade solution and a new method of stringing towers. The first innovation “overlay type” tower foundation provided a much more aesthetic solution than traditional concrete structures and was more appealing to landowners.
The new method for stringing towers allowed the high voltage power rope to be pulled through the centre of the tower, reducing the need of double handling, resulting in a safer and more efficient end-product. This initiative resulted in significant immediate cost reductions and has been adopted for future use on transmission lines throughout Tasmania.

ACKNOWLEDGEMENT OF COUNTRY

John Holland pays respect to the Traditional Owners and Custodians of the land on which we work and live, and their connections to land, sea and community. We pay our respect to their Elders past and present and extend that respect to all Aboriginal and Torres Strait Islander peoples today.