Siemens GEAFOL Operating Instructions Manual page 18

GEAFOL- / CARECO-Cast-resin Transformer/ Operating Instructions
Modification of high voltage
6.13
tappings
By changing the position of the connecting brackets at the
high-voltage coils, the voltage of the transformer can be
changed according to the rating plate (Fig 6.11)
The numbering of the taps is explained on a label on the
upper core frame of the transformer (Fig. 6.12)
WARNING!
The connecting brackets may only be reconnected when
the device is deenergized.
CAUTION!
Operating the transformer with a voltage that does not
correspond to the position of the switching jumpers on the
top voltage taps may cause damage to the transformer.
NOTICE!
The change in voltage can destroy connected components.
All connecting brackets at the HV windings must be fixed
at the same voltage tapping.
NOTICE!
Different positions of the connecting brackets on the indi-
vidual coils can destroy the transformer.
After reattaching, the screws of the connecting brackets
must be tightened to the torque shown on the label (Fig.
6.12)
Cover on taps of connection bar
If there are covers on taps, these must be re-assembled af-
ter the intervention (Fig. 6.13)
Clean the sealing surfaces before reassembling.
Turn the nuts onto the threaded pins by hand until the nut
rests on the cover. Use a wrench and turn the nut 1 1/4
turn.
Fig. 6-11: Operating voltage on the rat-
ing plate depending on the position of
the connecting brackets (SAMPLE)
Fig. 6-12: Information label on the trans-
former regarding numbering and tightening
torque of the taps (SAMPLE)
Fig. 6-13: Cover type A on taps
of Connection bar
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