Omicron CP TD1 - DF Limits of RBP Bushings (Micafil AG)

CP TD1 Reference Manual V 1.44
142
12.6 DF Limits of RBP Bushings (Micafil AG)
Limits are reached in approximately 25 years. Not valid for humid insulators.
a) Limits of the dissipation factor at 20°C:
b) Limits of the capacitance change (Delta C) at 20°C
Source:
Widmann, Karl: Zustandserfassung und Bewertung von
Durchführungen im Betrieb, MICAFIL Symposium Stuttgart, 1999
U rated [kV] DF (%)
36 2.5
73 2.3
123 2.0
170 1.8
245 1.5
300 1.3
302 1.15
420 1.0
U rated [kV] Delta C (%)
36 25
73 23
123 20
170 18
245 15
300 13
302 12
420 10