ElectraNet Managing the Risk of Transformer Bushing Failure PACR summary
In this section
In this section
- TransGrid Project Assessment Conclusions Report: Maintaining a reliable Upper Tumut substation
- SA Power Networks release new version of their Demand Side Engagement Document
- Douglas Shire Non-network options report
- TransGrid Project Assessment Conclusions Report: Managing safety and environmental risks from corrosion on Line 959/92Z
- Powerlink Queensland - Summary of PADR - Maintaining reliability of supply between Clare South and Townsville South
- ElectraNet Project Specification Consultation Report Managing the risk of protection relay failure
- Powerlink Queensland Project Assessment Conclusions Report Maintaining reliability of supply at Kamerunga Substation
- ElectraNet Project Specification Consultation Report - Managing the Risk of Isolator Failure Project Regulatory Investment Test for Transmission
- TransGrid Publishes TAPR 2019
- Powerlink Queensland Project Specification Consultation Report Addressing the secondary systems condition risks at Kemmis
- Powerlink Queensland Project Specification Consultation Report Addressing the secondary systems condition risks at Mudgeeraba
- Reinforcing the New South Wales Southern Shared Network to increase transfer capacity to the state’s demand centres
- Managing the Sydney East substation’s asset risks
- Maintaining compliance with performance standards applicable to Wagga 330 kV substation secondary systems
- Maintaining compliance with performance standards applicable to Deniliquin substation secondary systems
- Powerlink Queensland - Project Specification Consultation Report - Maintaining reliability of supply in the Blackwater area
- Powerlink Queensland Project Specification Consultation Report - Maintaining power transfer capability and reliability of supply at Lilyvale
- Maintaining compliance with performance standards applicable to Haymarket substation secondary systems
- Maintaining a reliable Static Var Compensator at Lismore
- Powerlink Queensland - Project Assessment Draft Report - Maintaining reliability of supply at Kamerunga Substation
ElectraNet has published a Project Assessment Conclusions Report (PACR) as the final stage of an investigation of the most economic option to manage the risk of transformer bushing failure on the South Australian transmission network. This concludes the Regulatory Investment Test for Transmission (RIT-T) for this replacement expenditure (‘Repex’) assessment, as required by the National Electricity Rules clause 5.16.
There is a need to replace over 100 transformer bushings fitted on 18 power transformers across the transmission network based on their assessed condition. The bushings are located at 10 metropolitan and rural substations which are now reaching, or past, the end of their technical lives.
ElectraNet applies a risk-based approach and assesses the condition and required timing of replacement of transformer bushings as part of its ongoing asset management processes. If the identified bushings are not replaced, there is an increased likelihood that a number of these assets will fail within the next 10 years.
The PACR confirms the conclusion of the Project Specification Consultation Report issued in August 2018 that replacing the identified bushings in the next three years is the preferred option. This estimated cost of this work is $6.86 million ($2017-18).
ElectraNet has undertaken rigorous sensitivity analysis to investigate the robustness of the RIT-T assessment to the key assumptions. The preferred option was demonstrated to deliver positive net market benefits for customers and to be robust across all sensitivity tests undertaken.
ElectraNet will now commence work on replacing the identified bushings in January 2019. The PACR is available for download at www.electranet.com.au.