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Voltage tap
The voltage tap is available as an option, instead of the test tap.
The bushing has a voltage tap that is connected to the second outermost conductive layer of the condenser
core. The voltage tap is used to measure the bushing insulation by capacitance and dissipation factor. The
cover connects the outermost conductive layer to ground, and must always be installed when the bushing is
energized.
The maximum one minute test voltage for this voltage tap is 20 kV
power source, if it is connected to an external capacitance. The operating voltage is limited to 6 kV.
CAUTION!
Do not energize the bushing without a test adapter or the cover installed. The cover connects the
outermost conductive layer to ground and will prevent damage to the bushing.
1
Stud
2
Cover
3
Grounding spring
4
O-ring
2.2 Transformer testing
To simplify the transformer testing, several alternatives are available instead of using the GIS-system.
•
The GSBK bushing can be used as an oil-to-oil bushing.
•
The GSBK bushing can be replaced by an oil-to-air bushing, in the combinations listed in the table.
Type
GSBK 245
GSBK 362
GSBK 420
GSBK 550
NOTE!
The GSBK draw-rod system is not compatible with the GOE draw-rod system.
10
Alternative bushing
GSB 245 or GOE(2) 1175-850
GSB 362 or GOE(2) 1175-850
GSB 420 or GOE(2) 1425-1050
GSB 550
. The voltage tap can be used as a
rms
Note
-
GOE(2) 1175-850 has an oil-side
that is 110 mm shorter than GSBK
362.
-
-
Installation and maintenance guide
1ZSC000563-AAB EN, REV. 6, 2019-09-12
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