Abstract
Knowledge of the electric field distribution can deepen
the understanding of the flashover behaviour of outdoor insulators.
The AC electric field under dry conditions and during rain
has been measured along a post'insulator With a field probe.
Corona activity from the flange carries the potential towards
the boundary of the corona region: the 'electrical geometry' of the insulator is modified. The experimental results agree with
~dd calculations based oil this modified 'electricru. geometry'.
DV photography supports the findings of the field measurements.
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