If an internal inspection is required, assure that:
1. There is no evidence of moisture.
2. All available bolted connections are tight.
3. There has been no shifting of any parts or any other
damage.
The external inspection should determine that:
1. All scratches have been painted.
2. The bushings are clean.
3. The accessories are operative.
4. There are no tools, or other objects, left on top of the
transformer or inside any enclosure.
5. The liquid level is correct.
6. The transformer holds positive pressure.
7. The manhole covers are tightly bolted.
8. All protective covers are closed and bolted tight.
9. The mechanical pressure relief device is reset.
CAUTION
Whenever it is necessary to open a liquid-filled trans-
former, insure that the liquid temperature is higher
than the outside air temperature. Otherwise, internal
moisture condensation may occur, which could lead to
failure of the transformer.
CAUTION
Before breaking the seal of any handhole, manhole or
bushing hole, bleed internal pressure to zero. Seals
should not be broken in the presence of fog, rain or
snow, or if there is any evidence of condensation on the
transformer tank. If even a very slight amount of such
moisture enters the transformer tank, it can decrease
the dielectric strength of the cooling liquid to danger-
ously low levels, which can result in damage to the
equipment.
CAUTION
Only authorized personnel should be permitted on top
of the transformer and every precaution should be taken
to avoid dropping objects into the transformer. Workers
should not have anything in their pockets (such as pens,
pencils, coins, etc.) and their clothing should not have
loose metal buttons, badges, buckles, etc. Wristwatches
should also be removed. When dropped into the
transformer tank, such objects can cause equipment
malfunction and damage.
3SubStation tranSformer inStallation and partS replacement information MN202002EN JUNE 2016
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