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Omicron CP TD1
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CP TD1 Reference Manual V 1.44
138
between the C1 layer/foil and the surrounding materials, as shown by patterned
areas in Figure 12-4. Depending upon the design, the C2 power factor of these
bushings can range from 0.1% to 2%.
Figure 12-4 Design/construction details of a typical high current type T
bushing and the influence of surrounding materials/objects
One of the factors that can significantly influence the C2 capacitance in bushings
with long internal C1 layer/foil and a short mounting flange is the external ground
plane. The following table shows the effect of proximity and type of ground plane
on power factor and capacitance of two different types of condenser bushings.
Type AB, which is similar to an O Plus C bushing with a metallic mounting flange
and a long external ground sleeve. Type T bushing with short mounting flange
and a long internal C1 layer/foil as shown in figure 12-4.
Paper
Voltage
Equalizers
C1 Layer/Foil
Bushing Oil
Paper
Lower
Porcelain
Central Conductor
Upper Porcelain
Tap Assembly
Coupling Effect
Between the External
Ground Plane and the
C1 Layer/Foil
Transformer
Tank

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