Project Overview
UDCS Consulting was engaged by Zinfra (NSW), on behalf of TransGrid (NSW), to undertake bespoke engineering for the preliminary design of a 132kV overhead feeder forming part of the Coppabella Wind Farm network connection and the rebuild of the existing TransGrid feeder M99.
The project involved both new transmission infrastructure and the upgrade and reconfiguration of existing assets, requiring a coordinated and technically robust design approach.
Scope of Works
UDCS Consulting was responsible for the preliminary design of multiple transmission elements, including:
- Rebuild of approximately 40 km of existing 132kV feeder 99M as a double circuit, incorporating single and twin conductor configurations
- New construction of approximately 8.5 km of 132kV single circuit feeder (9R0)
- Rearrangement of 132kV feeders within Yass Substation
- Assessment and design considerations for potential undergrounding of existing 66kV or proposed 132kV feeder sections
The engagement included delivery of all bespoke electrical, civil, and structural engineering components, including:
- Development of Basis of Design documentation
- Hazard Identification (HazID) and risk assessments
- Conductor and insulation selection
- Earthing system testing and design
- Lightning performance modelling
- Structural and foundation design
- Line layout and preliminary construction scheduling
- Constructability input to optimise staging and asset availability
- 66kV underground cable rating, selection, and sheath bonding design
- Design of 66kV overhead-to-underground transition structures
Design Approach
The project required a comprehensive preliminary design approach to support feasibility, constructability, and cost optimisation.
UDCS Consulting focused on identifying key project risks and opportunities early in the design phase, ensuring that technical solutions aligned with both client requirements and network constraints. Innovative design methodologies were applied, including alternative approaches to feeder crossings and construction staging to maintain network availability.
Project Outcomes
- Delivered preliminary design within a tight project timeframe
- Identified design opportunities contributing to an estimated cost reduction of approximately $4.5 million
- Developed innovative solutions for complex transmission line crossings
- Highlighted key risks and constraints impacting overall project viability and cost
