Siemens has successfully short-circuit tested and certified a single-phase 500 kV autotransformer with a power rating of 300 MVA.

The tested unit is one of the largest short-circuit tested autotransformers in the world and has been certified by a third-party testing laboratory in the Netherlands.

The 225-ton autotransformer was manufactured in Siemens Transformers factory in Guangzhou, China from where it was transported to the Netherlands for testing.

After the initial test in the Netherlands, the transformer was shipped back to China for further customer acceptance tests and visual inspection of the active part, before it received a certificate of short-circuit performance.

The design and service application for this type of transformer is to be typically used for areas with large transmission distances, such as those in Asian and South American countries.

Source: Siemens