Required Tools; Required Material; Oil; Oil Conservator - ABB UBB Series Installation And Commissioning Manual

1.1 Required tools

– Air pump with hose, pressure gauge (0-250 kPa) and
connection with internal thread R 1/8"
– Standard set of open end wrenches (up to 19 mm)
– Standard set of sockets (up to 19 mm)
– Socket handle
– Socket extender
– Standard set of screw drivers
– Allen key sockets 5 and 6 mm
– Lifting bar LL 117 016-K (yoke-mounting only)
– Dynamometric wrenches, 5-85 Nm
– Bottom valve key (delivered with the tap-changer)
– Tool for opening of oil drum
– Hack saw
– Bucket, 10 liters
– Lifting jack

1.2 Required material

– Grease, (Ball bearing grease) GULF-718 EP, Mobil-
Grease 28, SHELL-Aero Shell Grease 22 or similar
– Equipment for oil filling
– Sealing tape
– Rags (lint-free) for cleaning

1.3 Oil

The oil quality should be of Class II according to IEC 60296,
2012-02. The oil weight according to table 1 in section 1.6.
WARNING
Do not energize the transformer until oil has been
filled according to chapter 6 in this guide.

1.4 Oil conservator

The tap-changer has to be connected to an oil conservator.
ABB recommends the use of a separate conservator for the
tap-changer with both oil and air side separated from the
main conservator of the transformer.
The volume of the conservator should be such that there is
oil left in the conservator even at the lowest oil temperature
expected and such that no flooding can occur at the highest
oil temperature expected. Even transformers with more than
one tap-changer unit require only one conservator.
A suitable dimension of the tube for connection to the
conservator is an inner diameter of approximately 20 mm.
The tube should be inclined at least 3° to avoid gas cushions
in the tube. A valve in the connection to the conservator is
recommended.
The conservator must be equipped with a breathing device
that does not allow moist air into the conservator and that
allows the gas from the arcs to disappear.
The conservator should also be equipped with an oil
level indicator, and an alarm contact for low oil level is
recommended.

1.5 Oil filter unit for continuous oil filtration

If the tap-changer should have an oil filter unit for continuous
oil filtration from ABB, installation and commissioning
instructions can be found in the oil filter unit manual, delivered
with the oil filter unit.

1.6 Weights

The approximate weight of the tap-changer is stated in
Table 1. The motor-drive mechanism and the drive shaft
system are not included in the overall weight.
Table 1. Dimensions and weights of tap-changer, type UBB.
Type designation Dimension H
mm
UBBLN XXX/YYY 1193
UBBRN XXX/YYY
UBBDN XXX/YYY
UBBLT XXX/YYY 1489
UBBRT XXX/YYY
UBBDT XXX/YYY
Motor-drive mechanism (BUL2):
Motor-drive mechanism (BUE):
Drive shaft system:

1.7 Tightening torque

The following tightening torques are recommended:
For metallic bolt joints:
if not otherwise stated in this guide.
1ZSE 5492-118 en, Rev. 5 | Installation and commissioning guide UBB 11
Approx. weight in kg
Tap-changer Required Total
without oil oil
140 100 240
155 125 280
95 kg
130 kg
Approx. 10 kg
M6 .......... 10 Nm ±10 %
M8 .......... 24.5 Nm ±10 %
M10 ......... 49 Nm ±10 %
M12 ......... 84 Nm ±10 %