Underwater Electrical Discharge with a Large Surface of Radiation

Breakdown and formation of surface electric discharge in a zone of turbulent agitation of water jet transverse to the axis of an electrode system are studied. The jet boundary is actually a two-phase medium favorable for electron breeding consisting of cavitation microbubbles up to 10 7 cm -3 in vol...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2007-10, Vol.14 (5), p.1291-1294
Main Authors: Azizov, E.A., Emelyanov, A.I., Yagnov, V.A.
Format: Article
Language:English
Subjects:
Breakdown
Breakdown voltage
Cavitation
Circuits
Conductivity
Electric arcs
Electric breakdown
Electric discharges
Electrodes
Fault location
Freshwater
Microorganisms
Plasma measurements
Streams
Surface discharges
Threshold voltage
Water
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Summary:Breakdown and formation of surface electric discharge in a zone of turbulent agitation of water jet transverse to the axis of an electrode system are studied. The jet boundary is actually a two-phase medium favorable for electron breeding consisting of cavitation microbubbles up to 10 7 cm -3 in volume. These features differentiate the considered discharge from a low-voltage breakdown in a stationary liquid. Abnormal properties of electric discharge in a submerged water stream take place both at the initiation and at the stationary stage. The threshold voltages are reduced by several times at the stream velocities of about 30 m/s, simultaneously the duration of the prebreakdown stage is reduced by one to two orders of magnitude. At the arc stage of the discharge, there is a developed emitting surface with plasma shell thickness being about 1 mm. The change of initial water conductivity by four orders of magnitude does not lead to large changes in breakdown dynamics.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2007.4339491