12
1ZSE 5492-128 en, Rev. 4
2 Trouble-shooting
2. Trouble-shooting
This chapter mainly contains infomation used to locate a fault. Instructions for correcting the
fault, replacement of parts etc. are contained in chapter 3, Repairs and Adjustments.
2.1 On-load tap-changer
Error condition Fault nding procedure
High oil level alarm. A rising oil level in the on-load tap-changer oil conserva-
tor may indicate a leakage between the on-load tap-
changer and the transformer main tank.
Make sure that the cause for the alarm is not over-lling
at commissioning or overhaul. This can be checked by
adjusting the oil level according to ”Correct Oil Level”
in the Installation and Commissioning Guide and then
rechecking some time later.
Low oil level alarm. A lowering oil level in the on-load tap-changer may indi-
cate a leakage. If there is no visible leakage, adjust the
oil level according to ”Correct Oil Level” in the Installation
and Commissioning Guide then rechecking some time
later.
2.2 Pressure relay
CAUTION
To take the transformer into service after a pressure relay trip without opening the front cover
and carrying out a careful investigation of the active part, and repairing faults, if any, may
cause severe damage to the on-load tap-changer and the transformer.
Error condition Fault nding procedure
The pressure relay has
tripped during normal op-
eration.
Tools required:
- Air pump
- Manometer
- Screwdriver
- Megger (500–2 000 V)
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