System Manual
14
Figure
Name
Description
20
40
60
80
100
120
Winding temp indicator*
To obtain the temperature of the
winding. The alarm temperature is set to
be 100°C
a)
The tripping temperature is set to be
110°C
b)
Pressure gauge
The pressure gauge is used to obtain
the pressure inside the oil tank.
Pressure relief valve
The valve automatically releases when
the oil pressure inside the oil tank
reaches 55kPa.
The locking device on the pressure relief
valve must be removed before
operation. refer to "Fig. 7-1 Remove the
locking device of the pressure relief
valve".
MIN
-30 C
MAX
Oil level indicator
The MV transformer will stop operating
if the oil level falls below the lowest scale
on the oil level indicator or below the oil
level scale required for safe operation of
the transformer.
When the oil level is excessively high,
open the drain valve to lower the oil
level.
When the oil level is excessively low,
disconnect the transformer and check
the oil tank for leakage. If so, open the
oil filling valve to fill the oil tank.
Tap changer
The tap changer has five tap positions.
For
the
voltage
and
current
corresponding to each tap position, refer
to the nameplate on the transformer.
Drain
valve
with
sampling
Open the valve for oil drainage when the
oil level is excessively high or when
operations such as maintenance are
required.
