MR OILTAP R, Installation And Commissioning Instructions, Page: 20 / 206

3 Product description
Maschinenfabrik Reinhausen GmbH 2015 20 4427410/00 EN OILTAP® R
Figure 3: Pipe connections with pipe bends
Pipe connection Q
Pipe connection Q is closed with a blank cover and, depending on the on-
load tap-changer type, is intended for the bushing of the tap-change supervi-
sory control supplied as an option or for connecting the oil filter unit.
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 provided for the attachment of the protective relay and
the connection of the on-load tap-changer oil conservator and can be inter-
changed with pipe connection Q.
Pipe connection E2
The pipe connection E2 is closed 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 and transportation of the transformer.
Name plate
The name plate is on the on-load tap-changer head cover.
3.2.3