Project Overview
Ergon Energy engaged UDCS Consulting to undertake a detailed survey, asset condition assessment, and line rating study for the 110kV feeder between Stanthorpe Substation (T60) and Warwick Substation (T58), comprising approximately 65 km of timber pole transmission line.
The objective of the study was to establish the condition and current capacity of the existing assets, determine the existing line rating, and identify works required to both maintain and improve the line’s thermal performance.
Scope of Works
UDCS Consulting delivered a comprehensive assessment of the transmission line, including:
- Full asset condition reporting covering every pole and associated structure, including photographic records (three images per pole), GPS coordinates, pole identification, structural condition, and recommended maintenance actions
- Detailed line rating study using PLS-CADD™, including development of a full 3D model of the existing line
- Delivery of a digital line model enabling a Google Earth (KMZ) fly-through of the entire route
- Assessment of current line capacity and identification of upgrade requirements to achieve both original and enhanced thermal ratings
- Re-modelling of the line to incorporate upgraded clearance requirements and revised structural configurations for refurbishment works
The study identified both maintenance requirements and upgrade pathways to improve the operational capacity of the network.
Design Approach
The analysis combined high-resolution field data capture with advanced modelling techniques to ensure accurate representation of existing conditions.
Survey data was collected using total station and reflectorless theodolite technology, enabling precise spatial and structural assessment of the entire line. This data was integrated into PLS-CADD™ to develop a detailed digital model of both existing and proposed configurations.
The approach focused on minimising unnecessary asset replacement by optimising pole top arrangements and identifying sections suitable for retention, while ensuring compliance with updated statutory clearance requirements.
All rating and refurbishment studies were undertaken in accordance with AS/NZS 7000 and Ergon Energy standard design practices.
Project Outcomes
- Identified that the existing line had effectively zero thermal capacity in its current condition
- Developed upgrade strategies to restore the line to its original 500°C rating
- Enabled further optimisation to achieve an upgraded 650°C rating as required by Ergon Energy
- Reduced overall refurbishment costs through minimisation of pole replacements and structural upgrades
- Improved asset understanding through complete digital modelling of the line
- Successfully delivered within required timeframes and in accordance with Ergon Energy requirements
