Phase Shifting Transformer

EnergyConnect, Australia’s largest transmission project, has reached a milestone with the arrival of the first Phase Shifting Transformer (PST) for the project following a convoy across two states and through the outback.

The $1.8 billion EnergyConnect project will allow energy to be shared between New South Wales, South Australia and Victoria, and enable the connection of more new renewable generation.

Transgrid and construction partner SecureEnergy are building the 700km New South Wales section of the project from Wagga Wagga to the South Australian border, and a connection to Red Cliffs in Victoria.

The 374t PST is a specialised transformer that controls the flow of active power on transmission networks and will be housed at Buronga substation near Mildura.

Transgrid Executive General Manager of Major Projects, Gordon Taylor, said, “EnergyConnect is a critical project that is helping us make Australia’s transition to clean, reliable, renewable energy possible.

“This transformer will be a key part of the energy superhighway Transgrid is building that will benefit millions of Australians and we’re excited to see it arrive, especially as it will be the first of this size installed in Australia.

“The delivery of the big-ticket equipment underscores the critical progress we’re making and the size just of the equipment needed to transport it is another example of the sheer scale of the project,” Mr Taylor said.

SecureEnergy Project Director, Samuel Basanta Lopez, said it is the first 330kV PST to be installed in Australia.

“This is an important milestone for the project because it signals that we are getting on with the job of building this extraordinary project, which has so many firsts,” Mr Basanta Lopez said.

The PST is the first of five specially designed and built by Hyosung in South Korea.

Hyosung Project Manager Martin Glass said, “Hyosung has enjoyed working with Transgrid and SecureEnergy through the design and test phases, and we’re very proud to provide the largest phase shifting transformers in Australia and to see them successfully delivered.”

The giant transformer was disassembled in South Korea for the sea voyage to Adelaide, where it was loaded onto a convoy of three prime movers – two to pull the load and one to push.

A 76.8t widening platform trailer with 128 wheels, imported from France, was needed to carry the transformer – but due to road weight limits it had to travel almost 900km via Broken Hill to the destination Buronga.

“Due to the dimensions and weights of the PST Main tanks, a very lengthy and complex permitting process was undertaken, involving many stakeholders over two states in South Australia and New South Wales,” Mr Basanta Lopez said.

“The wide and heavy load required traffic to be stopped along the route to be able to use both sides of the road to navigate corners and while crossing narrow bridges.” 

The logistics of the marathon road journey were managed by deugro Projects.

deugro Project Manager William Troughton said, “Countless hours were spent planning, scheduling, and preparing to ensure that the first PST unit into Australia was delivered to the Buronga project site without a hitch.

“We look forward to continuing this work with SecureEnergy and Hyosung, as well as our strategic partners, for the delivery of the remaining PST units, and to the safe and successful completion of the project,” Mr Troughton said.

The convoy also included a camera operator and a drone pilot from Floodlight Content, which specialises in capturing complex operation and large-scale projects.

Floodlight Content Producer Holly Howard said, “This was one of our longest road trips, and we used drones and other cameras to follow the massive transformer the entire way from Port Adelaide to Buronga.”

Once delivered to site, an overhead lift system and a HT500 skate system – the first of its kind in Australia – was needed to carefully manoeuvre the PST onto its concrete pad.

The next stage will be to align the interconnection chambers that connect the two transformer tanks together. Once that is done, work will get underway to connect the PST to the rest of the substation.

The 16ha Buronga site is the main hub that will connect New South Wales, Victoria, and South Australia. It will be one of the biggest and most sophisticated substations in the southern hemisphere and includes the five phase-shifting transformers, two synchronous condensers and four shunt reactors.

The arrival of the PST follows a busy month on the site including two all-night pours of 1,700 cubic metres of concrete for the foundations for two synchronous condensers.

Featured image: Phase one shifting transformer. Courtesy of Transgrid.

Assistant Editor, Utility magazine

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