Skip to content

Tyree Transformers successfully completes the onsite Overhaul of 300kV 375MVA Generator Step Up Transformers

  • Sales

Tyree Transformers has just completed another major overhaul for CS Energy’s Callide power station. Tyree has carried out two major transformer overhauls this year at CS Energy’s Callide site, near Biloela (100kms West of Gladstone QLD) during plant shutdowns. Working closely with the head contractor managing the shutdown, the Tyree team drained and internally inspected the Generator transformers (375MVA 300kV/21kV) and associated Unit transformers (25MVA 21kV/6.6kV).

The overhaul works included the insulation paper sampling for condition assessment using Degree of Polymerisation and tensile strength testing. During the shutdown period, various oil leaks were identified and rectified on the transformer, including the substantial 3 x 20000A /25kV MV bushing turrets. After completing the sampling and rectification works, the transformers were resealed to an oil tight state, refilled under vacuum, with the insulating oil both heat and vacuum processed in the transformer tank to remove both gas and moisture.

The Tyree team also replaced the insulating oil, rejuvenated the diverter chamber and supervised the servicing by the OEM of the On Load Tap Changers including diverter switch maintenance and contact replacement. Prior to the transformers being placed back into service, Tyree successfully completed a full battery of predictive condition assessment tests, functional testing and HV testing on all of the transformers maintained. Our works were completed on time, under budget without any reportable environmental or safety incidents under the Tyree Transformers integrated Safety, Environmental and Quality system procedures and risk assessments. The Callide shutdown project demonstrates Tyree Transformers continued commitment to supporting our customers with specialised transformer skills.

Tyree has also recently completed other site overhaul projects including the midlife refurbishment and bushing upgrades of Origin Energy’s Bendeela Hydro Electric Power Station 100MVA 330kV/16kV transformers.

Tyree Transformers has always supported the transformers we manufacture with a comprehensive site installation, testing and overhaul capability supported by our highly experienced in-house transformer design team. After our recent expansion the Tyree Transformer service team now has the capability to support all of our customer’s transformer field service & overhaul needs across all brands and ratings of transformers.

For inquiries about our transformer site services or for any of your transformer needs, please contact the Tyree Transformers team on or by telephone +61 248726177.