Accessories
Liquid level gauge
A liquid level indicator is provided 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. Under normal operating conditions, the pointer
should be between the lo/min and hi/max level markings.
The gauge may be furnished with SPDT (Single Pole Double
Throw) alarm contacts to give a remote annunciation of
low liquid level. For contact wiring and terminal points,
see the accessory connection diagram furnished with the
transformer.
Liquid temperature gauge
The temperature gauge is furnished to indicate the top
liquid temperature in the tank in degrees Centigrade. The
temperature-sensitive element is mounted in a leak-proof
well, permitting removal of the thermometer without lower-
ing 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 can be furnished with two SPDT contacts
for a high temperature alarm, for energizing a fan circuit or
for a low temperature alarm. The trip settings are indicated
by the red tick marks on the edges of the dial. For additional
wiring and contact settings, refer to the schematic furnished
with the transformer.
Figure 1. Liquid level gauge.
Figure 2. Liquid temperature gauge.
4 SubStation tranSformer inStallation and partS replacement information MN202002EN JUNE 2016
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