Flashover performance of a rod-rod gap containing a floating rod under switching impulses with critical and near critical times to crest
Date
2009-03-23T10:13:01Z
Authors
Viljoen, Ryan Andrew
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Abstract
The U-curves of five different test objects, three of which contain a rod floating object
at different positions within the gap, are characterised. During the testing, a high
speed camera was used to photograph the discharges. The results are compared to
Rizk’s theoretical model for determining the flashover voltage of gaps with floating
objects are presented. It is concluded that the position of the floating object within
the gap affects which discharge mechanism exists in each of the gaps. The effect
that each discharge mechanism has on the flashover voltage and time to crest of the
gap is shown. Time interval photographs are presented showing the formation of
a discharge channel due to the streamer mechanism. In evaluating the high speed
photographs it is seen that the extent of the branching of the discharge channel is a
function of the time to crest of the applied impulse, more branching is evident for
shorter times to crest.
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Keywords
Floating object, Switching impulses, Rod-rod gap