Installation and commissioning guide
1ZSC000563-AAF EN, REV. 4, 2021-06-23
55
3. Find leaking gas with gas detector (sniffer) near
the gasket.
G005046
End of instruction
5.2.4 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 tap.
Refer to 2750 515-142, “Bushing diagnostics and conditioning”.
• C
1
is the capacitance between the test tap and the outer terminal.
• C
2
is the capacitance between the test tap and ground.
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 Nominal capacitance (pF)
C
1
±10% C
2
* ±50%
GOE 2600 740 6000
* Reference values from Hitachi ABB Power Grids.
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