T&D World Magazine

Improving Power Supply for Residents in Sydney’s Lower North Shore

Above-ground power lines will be removed from a section of River Road, Greenwich and placed underground to improve the reliability of power supply to the Lower North Shore area of Sydney, Australia. Ausgrid General Manager Reliability John Eisenhuth said the work is part of a $3million project to help improve the supply of electricity to about 3,000 homes and businesses around Lane Cove.

“We know there have been six interruptions to the local power supply in the past 12 months caused mainly by trees,” Eisenhuth said. “More than a km of overhead power lines has already been removed and a small substation has been installed to help boost power supply to customers in the area.

“Placing an additional 700 m of 11-kV power lines underground and upgrading two other small substations will further improve the reliability of power supply to local homes and businesses. “he upgrade will also inject more than 1,000 A of extra capacity into the local electricity network.”

The remaining work includes:

  • Trenching 300 m to house new underground cables
  • Removing 700 m of high voltage overhead power lines
  • Replacing a kiosk substation in Kara St, Lane Cove
  • Upgrading equipment in a kiosk substation at Greenwich Hospital
  • Installing Smart Grid technology on the high voltage overhead network to help isolate and identify faults.

About 60% of interruptions on the Ausgrid network are caused by external activities like trees coming into contact with power lines. “Areas like Lane Cove and Greenwich, with mature trees lining the streets, can pose some challenges for an electricity network,” Eisenhuth said. Undergrounding high voltage power lines will help reduce interruptions caused by trees hitting power lines.”

Work to underground the power line has begun and specialist crews including cable jointers and line workers are expected to complete the project by mid 2012.

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