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Installation and maintenance guide
1ZSC000563-AAB EN, REV. 6, 2019-09-12
5.2.3 Measurement of capacitance and dissipation factor
Overview
After installation of the bushing, it is recommended to measure the capacitance values for future reference,
such as repairs, service etc. This can be done on an installed bushing because it has an insulated test/voltage
tap. Refer to 2750 515-142, “Bushing diagnostics and conditioning”.
•
C
1
is the capacitance between the test/voltage tap and the outer terminal.
•
C
2
is the capacitance between the test/voltage tap and ground.
NOTE!
The transport container must be removed before measuring the capacitance and dissipation factor
(tan δ).
Nominal capacitance
The capacitance (C
2
) depends on the transformer, and it is not possible to give a nominal value that is valid
for all service conditions. Thus, it is important to measure and record the capacitance (C
2
) for future
reference, such as repairs, service etc.
Type
Space for CT = 300 mm
Space for CT = 600 mm
C
1
C
1
GSBK 170
496
656
GSBK 245
500
622
GSBK 362
405
494
GSBK 420
346
424
GSBK 550
286
353
Содержание GSBK 170
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