project Specifics
Twin 66/33 kV substation design for grid connection
The Susan River & Childers Solar Farm Substations were required to connect 75 MW and 56 MW solar farms to the Ergon Energy network. Our Team engineered two 80 MVA 66/33 kV substations receiving 33 kV from inverters and stepping to 66 kV for the Queensland state grid. Despite similar scopes, each site needed unique civil and access solutions.
Result: robust, standard-compliant grid connections delivering reliable renewable generation to the network.
About the Substations
Each substation provides the interface between the solar farm and the state grid – transforming 33 kV output from the farm’s inverter systems to 66 kV, meeting Ergon Energy standards for protection, secondary systems and operations.
Distinct access routes, ground conditions and flood considerations at Susan River and Childers meant the layouts and civil works were tailored to keep the sites operational and accessible in all weather, including flood events.
What We Delivered
Services:
- Primary substation design & equipment layouts
- Civil & structural design
- Earthing & lightning protection design
- Insulation coordination
- Secondary systems design
- Protection scheme design
- AC & DC auxiliary power systems
- Full detailed drawings
- Safety-in-Design assessments
- SCADA & communications panels
Delivery Method:
- Electrical Engineering Consultant
Outcome
Both substations were delivered to utility standards with designs adapted to site-specific geotechnical and access constraints. The client achieved reliable, flood-resilient connections and smooth commissioning, enabling the solar farms to export at full capacity and meeting network compliance. Resulting in a satisfied project team and successful handover.
A Welcon Project
This project was completed by our Welcon Team.
Since September 2024, Welcon Technologies has become part of SGA in a strategic move that leverages the strengths of both companies.
Welcon’s Team
