Amprion, a German transmission grid operator, and Siemens have jointly developed a large variable shunt reactor (VSR) with a regulation range of 80 percent. The unit was developed in close cooperation with the customer Maschinenfabrik Reinhausen.
The unit is equipped with a tap changer with 33 tappings to cover a rating from 50 up to 250 MVAr at a voltage level of 400 kV (3-phase-units), the manufacturer stated in a press release.
The main challenges were the general layout of the winding arrangement, the lead concept to the tap changer, and the huge shunt reactor dimensions.
So far, two units have been successfully manufactured and tested. The first unit was commissioned in 2016, while more units are in order backlog for 2018 and 2019.