3 Product description
Maschinenfabrik Reinhausen GmbH 2020
15
5993419/02 EN
VACUTAP
®
VMS
®
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, as a result
of which the transformer's transmission ratio is adapted to the prevailing op-
erating requirements.
Figure 1: System overview of on-load tap-changer, transformer
1 Transformer tank
6 Upper gear unit
2 Motor-drive unit
7 On-load tap-changer
3 Vertical drive shaft
8 Protective relay
