MR VACUTAP - Product Description and Components; On-Load Tap-Changer Functionality

3 Product description
Maschinenfabrik Reinhausen GmbH 2020 155788897/03 EN VACUTAP
®
VVS
®
3 Product description
3.1 On-load tap-changer
3.1.1 Function description
On-load tap-changers are used to adjust the transmission ratio of transform-
ers without interrupting the load flow. This makes it possible to compensate
for aspects such as fluctuations in voltage occurring in the power transmis-
sion grid. For this purpose, on-load tap-changers are fitted in transformers
and connected to the active part of the transformer.
A motor-drive unit which receives a control impulse (e.g. from a voltage reg-
ulator) changes the operating position of the on-load tap-changer, and the
transformer's transmission ratio is adapted to the prevailing operating re-
quirements as a result.
Figure1: System overview of on-load tap-changer, transformer
1 Transformer tank 6 Gear unit
2 Motor-drive unit 7 On-load tap-changer
3 Vertical drive shaft 8 Protective relay