Sensformer®: Digital Twin Operation in Australia

Since the launch of Sensformer® at last year’s Hannover fair, Siemens delivers Sensformer® units with connectivity worldwide. The successful concept of the digital transformer conquers the world – and is continuously evolving. Now the first Sensformer® advanced project was installed in Australia.

The 400-kV Basslink transmission line that interconnects Victoria and Tasmania in Australia was installed in 2006. While up to now it has been operated according to the operational limits of its components and the substation itself, nowadays it is sometimes required to transfer the maximum load in order to cover the energy load peaks either in Australia or in Tasmania. As the energy demand is still further increasing, it is important for the operator to gain knowledge on the behavior and ageing of the equipment and thus ensure their functionality over the planned lifetime.

An inspection of the most significant components such as converter valves, cables and power transformers showed that the equipment is generally in a good state. In particular, the HVDC transformers (196 MVA HVDC classic units for the 550-kV level on the high voltage side) are still in a healthy condition after 10 years of operation. To get more insight on their ageing and behavior under full load, they were equipped with additional sensors that allow the operator to get a complete picture of the thermal conditions in real time. With the data measured, significantly improved simulation and visualization of thermal images of the transformer now becomes possible. By logging and documenting these pictures, an individual thermal model can be set up. It simulates future transformer operational conditions based on a pre-defined set of parameters and user-defined parameters. Consequently, an improved load prediction algorithm can be implemented for a pre-defined loss of life scenario and for a given time in operation. This so-called digital twin operation enables prediction of loads for the transformer and the transmission line, based on a real-time image of the transformer based on the operation of the individual unit. Basslink’s site engineer Mark Bostedt is convinced that the digital twin will boost the interconnector’s operation: “Siemens’ continuing close cooperation with Basslink is assisting in the development of new software models that will benefit the ongoing successful operation of the Basslink interconnector. Both companies are working collaboratively to reach a favorable outcome.”

Transmission products play a vital role in the energy value chain. Siemens Energy Transmission Products offers all key elements including power transformers, gas-insulated and / or air-insulated switchgear and components, individually or bundled, with related engineering. With our global factory network and leading innovations we provide the highest level of quality and reliability to support our customers in achieving their objectives.