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Dissipation factor, tan δ
The dissipation factor varies with the temperature of the bushing core, and thus the measured dissipation
factor must be multiplied with the correction factor given below.
Bushing core temperature °C
0-2
3-7
8-12
13-17
18-22
23-27
28-32
33-37
38-42
43-47
48-52
53-57
57-62
63-67
68-72
73-77
78-82
83-87
Procedure
1.
De-energize the transformer.
2.
Disconnect the external connections from the outer terminal of the bushing.
3.
Remove the cover (58).
56
Correction factor to 20 °C (IEC)
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.34
1.35
1.35
1.30
1.25
1.20
1.10
Installation and commissioning guide
1ZSC000563-AAF EN, REV. 4, 2021-06-23
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