Positron 3782091C/50, User Manual

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Interpreting Graphic Results
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6.3 Composite Insulator Tester Results: Healthy Insulators
The graphs below show the insulator skirt (shed) on the horizontal axis, with “1” being the
insulator skirt nearest the tower side. The vertical axis represents the strength of the electrical
field in kilovolts/meter, expressed as “E-field (kV/m)”. The E-field is determined longitudinally at
each skirt along the energized composite (polymeric) insulator by the Probe.
The smoothness of the curves of the E-field characterizes a healthy insulator.
Skirt (Shed) Number
Skirt (Shed) Number
Figure 20: Graphic representations of the E-Field of two Healthy Composite
(polymeric) Insulators shown in the Log scale