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Instruction Manual
CT terminals: Secondary terminals not
used must be short-circuited and
grounded. NEVER leave the secondary
terminals of a current transformer in
open circuit.
VT terminals: Secondary terminals not
used shall stay in open circuit. NEVER
short circuit or earth more than one
point of each secondary terminals of a
voltage transformer
6.6. Terminal marking
Primary
and
marking are done according to the
specified standard. See set of drawing.
Primary and secondary connection
scheme are shown on schematic plates,
fixed on the Combined Unit.
7. OIL LEVEL INDICATOR
The position of the oil indicator can be
verified
through
window of the top cover.
The plate of the indicator is divided in
three areas. Central area shows the
green strip and higher and lower areas
are shown with a red strip. In normal
conditions, the indicator shows the
green strip of the indicator.
In case of oil level indicator is in either
of the red areas, the transformer must
be removed from operation and GE
informed immediately.
© GE Grid Solutions
secondary
terminal
the
rectangular
8. INSPECTION BEFORE FIRST
ENERGIZING
Verify terminals connections to assure
the correct tightening torque.
Verify if there are no open-circuited
secondary terminals for the CT and
shorted terminals for the VT.
Verify if one point of each secondary
terminal is connected to ground.
Verify the ground connections of the
ground pad.
Verify the correct position of the
primary terminal (transformer with
reconnection primary bars). See set of
drawing.
Verify that the oil level indicator is in
the green strip area.
Whilst all care is taken in the factory
during oil filling, the surface near of
screws and bellows could have a small
quantity of oil. This shall not be
considered as an oil leakage provided
the bellows are positioned within the
green strip area.
It is not necessary to remove oil
samples for analysis. The Combined
Transformer OSKF72 is hermetically
sealed
11
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