MR VACUTAP - Page 17

3 Product description
Maschinenfabrik Reinhausen GmbH 2020 175788897/03 EN VACUTAP
®
VVS
®
3.1.2.1 Pipe connections
Figure3: Pipe connections with pipe bends
Pipe connection Q
The pipe connection Q is closed with a blank cover.
The functions of the R and Q pipe connections can be interchanged.
Pipe connection S
The pipe bend on pipe connection S features a vent screw and can be con-
nected to a pipe that ends with a drain valve on the side of the transformer
tank at operating height. If the on-load tap-changer is fitted with an oil suc-
tion pipe, the on-load tap-changer can be completely emptied via pipe con-
nection S.
Pipe connection R
Pipe connection R is intended for attachment of the protective relay and con-
nection of the on-load tap-changer oil conservator and can be interchanged
with pipe connection Q.
Pipe connection E2
Pipe connection E2 is sealed off with a blank cover. It leads into the oil tank
of the transformer, directly under the on-load tap-changer head and can be
connected to a collective pipe for the Buchholz relay, if necessary. This pipe
connection serves a further purpose, namely to equalize the pressure be-
tween the transformer tank and oil compartment of the on-load tap-changer,
which is necessary for drying, filling with insulating fluid and transportation of
the transformer.