Commissioning; General; Reassembly; Required Tools And Materials - ABB VUBB User Manual

3. Commissioning

3.1 General

This section describes tasks to be carried out when the
transformer is being installed and tested on site.
CAUTION
The motor-drive mechanism must be protected
against condensation.
Make sure that the heater is energized when power
is available. When power is not available, put drying
agent inside the motor-drive cabinet and seal the
vents.

3.2 Reassembly

The conservator and accessories that may have been
removed during transport must be remounted.
The installation of accessories is described in the assortment
guide.
Depending on the transport requirements, the transformer
may or may not be delivered with the motor-drive mechanism
and drive shaft system attached.
WARNING
Before any work is carried out on the tap-changer,
make sure that the transformer is disconnected and
that grounding is properly executed. Obtain a signed
certificate from the engineer in charge.
CAUTION
Sealing surfaces and gaskets must be clean and
undamaged.
Diametrically opposed bolts in sealing joints must
be tightened alternately several times, beginning
with a low tightening torque and finally with the
recommended tightening torque.
Remember to place O-rings on the flanges.
1. Mount the motor-drive mechanism if it is not mounted
upon delivery. Mounting of the motor-drive mechanism is
described in a separate instruction manual.
2. Mount the external drive shafts if they are not mounted
upon delivery. See Section 3.6.
WARNING
The motor-drive mechanism must not be installed in
an explosive atmosphere. The electrical equipment
creates sparks that can cause an explosion.
Do not energize the transformer before the tap-
changer and motor-drive mechanism are mounted.
3. Refit the conservator.
4. Refit the accessories.
The pressure relay is usually delivered in a separate package
and installed upon commissioning.
The tap-changer may be delivered filled with oil or without oil.

3.3 Required tools and materials

The following tools are required for the installation of the tap-
changer:
– 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 18 mm)
– Standard set of sockets (up to 18 mm)
– Socket handle
– Socket extender
– Standard set of screwdrivers
– Allen keys for 5- and 6-mm sockets
– Hand crank LL 117 016-M
– Dynamometric wrenches, 5-85 Nm
– Tool for opening the oil drum
– Bucket, 10 liters
– Equipment for oil filling
– Rags (lint-free) for cleaning
The following greases (ball bearing greases) or similar are
required during installation:
– GULF-718 EP
– Mobil-Grease 28
– SHELL-Aero Shell Grease 22
1ZSC000562-AAL en | User's guide VUBB 17