A. Eberle Africa (Pty) Ltd. has been an approved supplier of voltage regulation for power transformers with tap-changers - REG-D and REG-DA - for more than 25 years.
These devices have been supplied directly from Germany , the A. Eberle headquarter with manufacturing line and test facility ( Made in Germany ) , to various systems integrators in South Africa ( Eskom-approved until today !) and to a lot of other African countries too.
https://www.a-eberle.co.za/