Managing the Risk of Corrosion between Vales Point and Sydney North on Line 22
In this section
In this section
- Powerlink Queensland - Project Assessment Conclusions Report - Maintaining reliability of supply to the Rockhampton area
- Powerlink Queensland PACR addressing the secondary systems condition risks at Woree Substation
- Powerlink Queensland PACR to maintain power transfer capability and reliability of supply at Ross Substation
- Maintaining a reliable Upper Tumut substation
- Managing safety and environmental risks from corrosion on Line 959/92Z
- Managing the Risk of Corrosion between Murulan and Dapto on Line 8
- Powerlink Queensland - Project Assessment Conclusions Report - Maintaining reliability of supply to the Brisbane Metropolitan area
- Powerlink Queensland - Project Assessment Conclusions Report - Maintaining reliability of supply at Townsville South Substation
- Managing the Risk of Corrosion between Vales Point and Sydney North on Line 22
- Powerlink PSCR Maintaining reliability of supply between Clare South and Townsville South
- SA Energy Transformation PACR
- SA Power Networks publishes Distribution Annual Planning Report
- Powerlink Queensland PACR Maintaining power transfer capability and reliability of supply at Bouldercombe Station
- Powerlink Summary Queensland PADR Maintaining reliability of supply to Rockhampton
- Powerlink PACR to address the secondary systems condition risks at Belmont substation
- Powerlink PACR to address the secondary systems condition risks at Abermain Substation
- TransGrid PSCR Managing Sydney East substation’s asset risks
- Powerlink Project Assessment Conclusions Report (PACR) to address the secondary system condition risks at Palmwoods Substation
- Project Assessment Conclusions Report – Addressing the secondary systems condition risks at Tarong Substation
- Project Specification Consultation Report - Maintaining power transfer capability and reliability of supply at Woree Substation
TransGrid has recently published a Project Assessment Conclusions Report for Managing the Risk of Corrosion between Vales Point and Sydney North on Line 22.
Constructed in 1962, Line 22 is a single circuit steel tower 330 kV transmission line connecting Vales Point and Sydney North 330 kV substations. The 86 km long transmission line predominately traverses small rural holdings, heavily timbered ridgetops and national parks. It crosses the M1 Motorway, Pacific Highway, Main Northern Railway line and numerous local roads.
TransGrid’s ongoing routine asset monitoring and maintenance revealed that many of the 190 transmission structures of Line 22 are corroded, including steel towers, insulators, conductor fittings and conductor/earth wire. Corrosion greatly increases the likelihood of conductor drop and presents consequent bushfire risks and safety risks.
In August 2018 TransGrid published a Project Specification Consultation Report (PSCR) identifying the proposed preferred option to mitigate the risks and claimed exemption from producing a Project Assessment Draft Report as allowed for under NER Clause 5.16.4(z1).
No submissions were received in response to the PSCR during the consultation period which closed in October 2018. No additional credible options that could deliver a material economic benefit were identified throughout the process and the outcomes of the economic analysis contained in the PSCR remain unchanged and maintained in this PACR.
The PACR recommends the replacing or refurbishing corroded components from 2018/19 to 2021/22. The estimated capital cost of the proposed preferred option is $9.08 million. TransGrid is the proponent of the proposed network project.
In accordance with the requirements of the Rules, a summary of the PACR has been made available on AEMO’s website. A copy of the Project Specification Consultation Report can also be obtained from TransGrid’s RIT-T Consultations webpage or by emailing RIT-TConsultations@transgrid.com.au.