Water drop to Metal and Water drop to Water drop Corona Discharges

Hinde, David D & Birtwhistle, David (2008) Water drop to Metal and Water drop to Water drop Corona Discharges. In XVII International Conference on Gas Discharges and their Applications, 7th to 12th September 2008, Cardiff University.




Water drop corona has been identified by many authors as a major cause of deterioration of silicone rubber high voltage insulation but at this stage there have been no thorough studies made of this phenomenon. In this paper fundamental observations are presented of electrical discharges from water drops, movement of drops, and drop coalescence in the presence of 50 Hz alternating electric fields. Measurements are made both with water drops on metal electrodes and with water drops on the surface of silicone rubber insulation. Comparisons are made of current pulses and atomic emission spectra from previous work by the authors on dry point-plane discharges to provide information about the main types of active species which may cause insulator surface degradation. Visual images of wet electrodes show how water drops can play a part in encouraging flashover. The first reproducible visual images of water drop corona at the triple junction of water air and rubber insulation are presented. The current measurements were captured with a digital oscilloscope sampling at 200 MHz. The time constant of the measuring circuitry was approximately 14 nanoseconds.

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ID Code: 14993
Item Type: Conference Paper
Refereed: Yes
Keywords: water drop corona discharges spectra
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > ATOMIC MOLECULAR NUCLEAR PARTICLE AND PLASMA PHYSICS (020200) > Plasma Physics; Fusion Plasmas; Electrical Discharges (020204)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Deposited On: 30 Sep 2008 00:00
Last Modified: 29 Feb 2012 13:41

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