ABB GOE(2), Installation And Commissioning Manual

Page: 53 / 80

Installation and commissioning guide
1ZSC000563-ACF EN, REV. A, 2020-06-25
53
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 Space for CT = 300 mm Space for CT = 600 mm
C
1
C
2
* C
1
C
2
*
GOE(2) 1175 407 800 470 1500
GOE(2) 1425 474 900 532 900
GOE(2) 1550 482 1000 535 1500
GOE(2) 1675 482 1000 535 1500
* Reference values from ABB Components.