McLaren Flat 66/11kV Substation is located near the township of McLaren Flat in the McLaren Vale region. It contains one 12.5MVA 66/11kV transformer, and supplies approximately 1,300 customers who are predominantly residential, rural and agricultural including wineries. Following a risk assessment SA Power Networks (SAPN) decided to upgrade the chainwire fabric perimeter security fencing. Bluedog was successful in its tender to supply and install GuardForce Max® intruder resistant high security fencing system. The powder coated Intruder Resistant fencing was installed to prevent unauthorised access to the high voltage substation. The welded mesh perimeter was fitted with a manually operated sliding Vehicle Access (VA) gate to suit an 8 metre opening with an adjacent Personnel Access (PA) gate. The substation was operational throughout the works. Some of the project specific challenges included:
The feature and beneficial outcomes of the fence system used included:
Feature: 3000mm high welded mesh panel with 8.5mm aperture between 4mm horizontal wires.
Outcome: The fence if very difficult to scale, increasing the deter and delay security value of the fence resulting in lower incidence of unauthorised access and consequent financial loss.
Feature: The welded mesh fence maintains natural surveillance into the zone substation.
Outcome: The ability to see into the substation and detect unauthorised persons is maintained as compared to other fence types increasing the overall security value of the fence.
Feature: The 4mm horizontal and 5.6mm diameter vertical wires are 12.5mm centres and at 75mm centres respectively.
Outcome: The close spaced mesh is time consuming to cut through the panel without the aid of power tools thus increasing the security value of the fence.
Feature: The close spaced wires are coated with a zinc alloy coating.
Outcome: The wire is highly corrosion resistant and superior to a pure zinc coating thus the reducing whole of life cost of the fence.
Feature: The mesh panel is topped with a serrated rail.
Outcome: The topping further increases the deter and delay security value of the fence resulting in a lower incidence of unauthorised access and consequent financial loss.
Feature: The 100 universal column (UC) posts with slotted front flange and 50x50x6mm equal angle rails are hot dip galvanised after fabrication.
Outcome: The steel structure is highly corrosion resistant reducing whole of life cost.