IG-302-EN version 01; 18/11/2020
19
General instructions
transforma
.bst-pm: Distribution transformers, hermetically
sealed, immersed in dielectric liquid from 16 to 100 kVA
(single-phase) / from 25 to 315 kVA (three-phase)
Maintenance
7.2. Checking the transformer
7.2.1. Transformer temperature
The working temperature of the transformer is directly
related to the service life of the insulating materials. It is
therefore necessary to monitor or control the maximum
temperature values recorded by the instrumentation.
In case the transformer had thermometer with calibrated
protection elements that give out an alarm/trip signal
whenever the appropriate work temperature is exceeded,
they have to be properly set.
7.2.2. Inspecting oil volume
The oil volume must be checked from the point of view of
insulation and cooling. If the oil level fluctuates significantly
relative to the transformer working temperature, the cause
must be determined before proceeding with repair.
7.2.3. Noise
If strange noises are heard to come from the transformer,
contact
Ormazabal
and report the circumstances, so we
can determine the cause.
7.2.4. Tightening bolts and threaded pieces
Whenever it is detected that the tank's earthing terminals
are loose, de-energise the transformer in line with the
instructions in section 6.1 and tighten them immediately.
7.2.5. Oil leaks
Leakage may occur in dielectric liquid transformers,
although this is not normally the case. If a leak is detected
in the transformer, contact
Ormazabal
immediately,
providing as much information as possible (including
photographs of the leak) in order to find a quick solution.
7.2.6. Paint
The transformers may show damage in the surface finish
due to impacts or as a result of handling and transport.
These defects in the paint may also show localised rusting.
Report any damaged paint to
Ormazabal
, sending photos
and a description of the damage in order to define the best
actions to solve the problem.
Below are some instructions on how to repair the affected
areas:
Summary of Contents for transforma.bst-pm
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