Positron 3782101C/50, Руководство пользователя

Страница: 63 / 74

Interpreting Graphic Results: Electric Railway Applications
57
6.4.3 Floating Defects
Floating defects on an insulator have a lesser effect on the surrounding E-Field.
Therefore, when evaluating graphic results of an insulator with floating defects, the
Logarithmic Scaling will expose floating defects more so than the Linear Scaling.
This an example of a C5 insulator with floating
defects shown in
Linear Scaling
Figure 34 is the same C5 insulator scan as
shown in Figure 33 , but shown using the
Logarithmic Scaling . Logarithmic Scaling
exposes more detail than the Linear Scaling .
The impact of the floating defects can be much
more clearly seen using the
Logarithmic
Scaling .
The reference curve for a known-good, clean C5 composite (polymeric) insulator should be used
to evaluate the curves displaying floating defects.
Figure 34
Figure 33
Reference curve
from Figure 35
Curve from Figure 34
exposing floating defects
Figure 35: Reference curve for a
known-good, clean C5 insulator
Figure 36: Reference curve for a known-good,
clean C5 insulator shown in Log scaling
superimposed over a graph of an insulator with
a floating defect in the middle of the insulator.