Accessories
Three-phase pad-mounted transformers can be equipped
with a variety of optional equipment. Most such accessories
are factory installed and no fieldwork is required to prepare
them for operation.
Liquid level gauge
Transformers may be furnished with a liquid level indicator
as optional equipment to aid in the systematic inspection of
the transformer under load. It consists of a float-arm inside
the tank, an indicating pointer and a magnetic coupling
between the two across a liquid-tight separation.
The gauge may have one or two SPDT (Single Pole Double
Throw) alarm contacts to give a remote annunciation of
low liquid level. For wiring and contact ratings, refer to the
schematic furnished with the transformer.
Liquid temperature gauge
Transformers may be furnished with a temperature gauge
as optional equipment to indicate the top liquid temperature
in the tank in degrees Celsius. The temperature-sensitive
element is mounted in a leak-proof well, permitting removal
of the thermometer without lowering the oil level. The
device is furnished with an additional red pointer to show
the highest temperature attained since the last reset. To
reset the maximum indicator, turn the knob in the center of
the dial.
The thermometer may have two SPDT contacts for
energizing a fan circuit or for a high temperature alarm. For
wiring and contact ratings, refer to the schematic furnished
with the transformer.
Figure 4. Liquid level gauge.
Figure 5. Liquid temperature gauge.
5Three-phase pad-mounted compartmental type installation and maintenance instructions MN202001EN August 2015
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