Installation and commissioning guide
2750 515-1 EN, REV. 14, 2020-06-26
63
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 Space for CT = 305 mm Space for CT = 605 mm
C
1
C
2
* C
1
C
2
*
GOE 250-210 432 290 571 480
GOE 380-300 432 290 571 480
GOE 650-500 389 300 490 480
GOE 950-650 370 658 454 790
GOE 1050-750 373 390 431 590
GOE 1175-850 391 480 465 840
GOE 1300-1050 515 640 550 896
GOE 1425-1150 515 640 550 896
GOE 1550-1175 463 700 460 700
GOE 1675-1300 463 700 460 700
GOE 1800-1360 463 700 460 700
GOE 2550-1600 550 4610 560 4820
GOE 2550-1675 585 5000 669 5700
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