Quantcast Figure 2-6. Temperature winding snap action auxiliary switch contacts and lead color code

 

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Figure 2-5. High voltage cabinet, upper front panel
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TM-5-6120-250-12 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Manual
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Figure 2-7. Transformer gages
b.
Transformer (fig. 2-7).
(4) The winding temperature gage (2, fig. 2-
7) provides a means of reading an equivalent of the
(1) The liquid-level gage (1) is a magnetic
transformer winding hot-spot temperature. The gage is
gage to indicate the level of the insulating oil in the main
a standard type AWR. It consists of a thermometer with
transformer tank.  The level will rise .50 inches for
(every 10C rise in temperature.  The gage may be
two snap action switches mounted in a hermetically
sealed case. The switches permit the instrument to be
removed whenever the liquid is at or below the 25 Level
used to initiate an alarm in the event winding
temperatures become excessive. The dial is calibrated
(2) The pressure-vacuum gage (3) is of the
in degrees centigrade.  A white pointer indicates the
compound type and is calibrated in psi. Gage reading
winding hotspot temperature. A red pointer shows the
should vary as the transformer temperature (changes
maximum temperature obtained since last reset.  To
and should normally indicate a positive pressure. (The
reset the maximum reading (red) pointer remove the
gage is expected not to read accurately near the zero
magnet (5), that is attached to the gage by a chain, from
point).  When the transformer is deenergized or is
its holder on side of case. Wipe magnet across face of
operating under light or no load conditions in low
dial counterclockwise, or toward zero. Replace magnet
ambient temperatures the gage may indicate a vacuum
in holder. For switch lead color code and contacts see
within the tank. A lack of any change in reading with
changes in temperature is an indication of a leak in the
transformer seal and should be investigated.  See
nameplate (61 for maximum plus and minimum minus
readings.
(3) The liquid temperature gage (4, fig. 2-
7) is used to indicate the top liquid temperature of the
transformer.  It is a standard type AL thermometer
mounted with its temperature sensitive bulb in a well.
The well extends into the transformer's top liquid and is
secured with a union nut. the well is liquid-tight thus
permitting removal of the thermometer without lowering
the liquid level or breaking the transformer seal. The
dial calibration is in degrees centigrade. A white pointer
indicates the liquid temperature. A red pointer shows
the maximum temperature attained since last reset. To
reset the maximum reading (red) pointer, remove the
Figure 2-6. Temperature winding snap action auxiliary
magnet (5), that is attached to the gage by a chain, from
switch contacts and lead color code.
its holder on side of case. Wipe magnet across face of
dial counterclockwise, or toward zero. Replace magnet
in holder.
2-11

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