Sydney north sub-transmission upgrade

The entire project saw over 40 workers, including cable jointers and substation technicians, install more than six km of 33,000 V cable between Ausgrid’s Ku-ring-gai sub-transmission substation and its zone substations in St Ives and Lindfield.

During the installation, the cable needed to cross a major railway intersection so Ausgrid decided the best way to minimise railway and traffic disruptions was to employ the use of Trenchless Technology. Ausgrid’s Energised Alliance contracted Infrastructure Construction for the No-Dig component of works.

Infrastructure Construction completed a 50 m long microtunnel under a major railway line as part of the Ku-ring-gai sub-transmission substation to Lindfield Zone Substation Section of the cable, which was in the south stage of the project.

The company used a horizontal directional drill with a 450 mm drill was used to create four separate cores in parallel, carrying a bank of six conduits each. The bore ran from Wolsely Road to Lindfield Avenue in Linfield. Crew worked for approximately a month, drilling at a depth of about 14 m below railway line.

Crews have now begun the second stage of the $A40 million set of works including the upgrade of the existing 132/33 kV Ku-ring-gai STS and a re-fit of the 33/11 kV Lindfield zone substation.

Ausgrid General Manager Transmission Trevor Armstrong said the existing Ku-ring-gai STS and Lindfield zone substation had served the local community well for almost 50 years but were now approaching the time for renewal.

Ausgrid crews are expected to complete the upgrade of the Lindfield zone substation in late 2012.

Work on the Ku-ring-gai STS is scheduled to begin this year and is expected to be complete in 2014.

The upgraded substations and new sub-transmission cables will help improve the reliability of power supply to more than 45,000 homes and businesses in St Ives, Pymble, Turramurra, Chatswood, Warrawee, Lindfield, Killara, Roseville, Gordon, Ku-ring-gai and Wahroonga.

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