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4. Checking of the emergency stop
Give a RAISE or LOWER impulse and after about one
second press the emergency stop. The operation should be
interrupted. Reset the emergency stop by turning the knob
clockwise and set the protective motorswitch to ON. The
started operation should now be completed. Operate back to
service position.
5. Checking of the earth fault protector (option)
If the motor-drive mechanism is equipped with an outlet, the
earth fault protector should be tested by pressing the test
knob on the outlet on BUE or on the separate earth fault
protector on BUL.
6. Checking of the heater
WARNING
Before starting any work inside the motor-drive
mechanism the auxiliary power must be switched off.
N. B. The motor, contactors and heating element may
be energized from separate sources.
Disconnect the incoming auxiliary power.
Open the control panel (BUE only).
Check by feeling with a finger on the protection plate that the
heater has been functioning.
Close the control panel (BUE only). Reconnect the incoming
auxiliary power.
Complete the inspection by turning the selector-switch to the
REMOTE position and closing the cabinet door.
7. Checking of the oil filter unit (option)
If the tap-changer is equipped with an oil filter unit from ABB:
– Read the pressure gauge.
– Note the reading so the change from year to year can be
seen.
If the pressure is 2.0 bar or more, or close to 2.0 bar, the filter
insert should be replaced.
If moisture is suspected to have come into the tap-changer
compartment, the filter insert should be replaced.
If a filter insert replacement is needed, call a specialist.
Also check for leakages. All leakages should be repaired!
Restoring the gas cushion
In case the tap changer has an oil filter unit from ABB that
is installed according to our instructions, no outage of the
transformer is necessary. See the manual for oil filter unit.
WARNING
Before any work is carried out on the tap-changer:
Make sure that the transformer is disconnected and
that earthing is properly carried out. Obtain a signed
certificate from the engineer in charge.
Proceed as follows:
1. Shut the conservator valve.
2. Connect a hand pump to the oil valve and start to suck
out oil. Open the air release valve to the tap-changer and
let air in. Stop pumping after about 2 litres of oil have been
sucked out from the tap-changer.
3. Shut the air release valve and the oil valve and disconnect
the pump.
4. Open the conservator valve and an appropriate gas
cushion will be formed.
1ZSE 5492-156 en, Rev. 4 | User's manual UBB 7