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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
58-62
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 (2).
Installation and maintenance guide
1ZSC000563-AAB EN, REV. 6, 2019-09-12
Correction factor to 20 °C (IEC)
0.76
0.81
0.87
0.93
1.00
1.07
1.14
1.21
1.27
1.33
1.37
1.41
1.73
1.43
1.42
1.39
1.35
1.29
49
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