Downer delivers AusNet’s first commissioned IEC 61850 controlled substation
Downer designed and delivered a 3-bay 66 kV substation for a private data centre in Victoria between July 2023 and December 2024. The works included foundations for 2 66/22 kV, 75 MVA transformers, primary plant, cables and earthing, 22 kV customer cables and control-room infrastructure. The scheme uses IEC 61850 communications and fibre-based protection and control.
- Publish date: 2025-08-19
- Category: EPC Contractors
- Original source: Downer
- Reading time: 2 min
Reported scope and milestone
Downer designed and delivered a 3-bay 66 kV substation for a private data centre in Victoria between July 2023 and December 2024. The works included foundations for 2 66/22 kV, 75 MVA transformers, primary plant, cables and earthing, 22 kV customer cables and control-room infrastructure. The scheme uses IEC 61850 communications and fibre-based protection and control.
Engineering interpretation
“First” refers to AusNet’s first commissioned substation using IEC 61850 control, not a national or global first. The digital protection and control architecture links bay equipment through communications, while the 2 75 MVA transformers and 22 kV customer circuits define the facility’s supply interfaces.
Delivery responsibilities
A joint venture, alliance or integrated delivery arrangement distributes responsibility among organizations with different technical and contractual roles. The useful reference is the package each participant actually manages, designs or constructs. Interface registers and acceptance plans should connect those packages without erasing their boundaries. Work at a shared project is not proof that one firm owns the whole contract or completed every asset. Procurement and construction reviews should retain the named partners, the recorded milestone and the distinction between delivery participation and operation.