Ultraviolet solar-blind cameras are used for inspection and research within the High Voltage domain. The current research in the field is compared with each other, considering image processing and radiometry (energy). From this comparison and research experience, the aspects for the relation between optical and electrical energy are identified. These aspects include Ultraviolet camera selection, characterization, calibration, saturation and processing. Furthermore, the electrical aspects also highlighted are test configurations, partial discharge, atmospheric conditions and test standards. Practical examples are presented.
The aim of this paper is to compare the electrical performance of an orthogonally with a coaxially laser-triggered spark
gap. Each of these two gaps has its own advantages and disadvantages. At the same time, a Rogowski profile spark gap
was investigated in terms of its orthogonally laser-triggered performance. It was found that the Nd:YAG laser used
(1 064 nm, 800 mJ) was able to reduced the breakdown voltage of a 50 mm gap by 70% from 135 kV to about 40 kV.
The position of the laser-induced plasma was found to play a significant role in the breakdown process - best results
being obtained when the laser was focused in the centre of the gap. Finally, the shape of the laser-induced arc is
dependant on the applied electric field. When the field is low, the arc tends to avoid the laser-induced plasma thus
exhibiting a very anomalous behaviour. When the field is increased, the arc tends to attach itself to the plasma as
expected.
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