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User’s guide VUBB
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6. Troubleshooting
This chapter provides information used to locate faults on the
tap-changer. Instructions for correcting faults, replacing parts,
etc. are in Section 7.
Error condition
Troubleshooting procedure
High oil level alarm
A rising oil level in the tap-changer conservator may indicate
leakage between the tap-changer and the transformer main
tank.
1. Make sure that the alarm is not due to overfilling upon
commissioning or maintenance. This can be checked by
adjusting the oil level according to Section 3.5.3.
2. Recheck the oil level later.
Low oil level alarm
A low oil level in the tap-changer may indicate leakage.
1. If there is no visible leakage, adjust the oil level according to
Section 3.5.3.
2. Check the oil level later.
Pressure relay has tripped
For troubleshooting instructions regarding the pressure relay,
see the assortment guide.
Note the number of operations and then lift the tap-changer
insert. Inspect the tap-changer according to the maintenance
guide.
The control system or the motor-drive mechanism is
malfunctioning
Follow the instructions given in the separate guide for the
motor-drive mechanism.
Drying agent has changed color from the bottom of the
breather
Dry or replace the drying agent.
Drying agent has changed color from the top of the
breather
There is a leakage in the connections to the conservator.
Locate the leakage and seal it.
CAUTION
Do perform service on the transformer after a
pressure relay trip; contact the manufacturer.
