IG-168-EN version 05; 17/04/2020
19
General instructions
transforma
.dis: Distribution transformers immersed
in dielectric liquid up to 3150 kVA
Installation
5.2. Transformer site
The transformer site for both indoor and outdoor
installations must allow adequate cooling.
Poor ventilation of the transformer may cause it to
overheat.
Both the technical conditions and the personal and property
safety requirements of the transformer's design and site are
defined in the applicable legislation and standards at the
place of installation.
If the transformer is installed indoors, prepare a horizontal
base that supports the transformer. Take into account the
total weight of the transformer, which is shown on its name
plate.
Lock the rollers to prevent the transformer from moving
during operation.
Natural esters have higher freezing points than those
of mineral oil. The liquid could therefore freeze during
prolonged exposure to temperatures below -10°C. In
these cases, the transformer can be powered without
affecting its physical-chemical properties. However,
the transformer should be protected from low
temperatures during prolonged storage periods.
5.3. Transformer electrical connections
5.3.1. Standard procedure
Risk of death by electric shock and of irreversible
damage to the transformer or to the electrical
installation.
• The transformer's electrical connections can only be
made by qualified personnel while always observing
proper electrical safety measures.
The steps to follow to complete the electrical transformer
connection are as follows:
1.
Check that the electrical power supply to the
transformer matches the service values shown on the
transformer’s name plate.
Risk of causing irreversible damage to the
transformer or to the electrical installation.
• Verify that the electric power supply to the transformer
meets the service values shown on the transformer’s
name plate.
2.
Open all the electrical power sources and interlock or
block the necessary breaking devices to prevent any
power supply.
3.
Check that electrical voltage is not present.
4.
Earth and short-circuit all the electrical power sources.
5.
Delimit and mark the work area properly.
Summary of Contents for velatia transforma.dis
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