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1ZSE 5492-129 en, Rev. 6
2. Trouble-shooting
This chapter mainly contains information 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 finding procedure
High oil level alarm. A rising oil level in the on-load tap-changer oil con-
servator may indicate a leakage between the diverter
switch housing and the transformer 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 the transformer
documentation and then rechecking some time later.
Low oil level in the oil conser-
vator
1. Check for leakages.
2. If no leakages are found, the gas cushion is solved
in the oil and should be restored. Follow the instruc-
tions in section 3.3 in this guide.
Pressure relay trip See section ”Pressure relay” in this guide.
2. Trouble-shooting
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