Discharge Transitions of Parallel Dielectric Barrier in Atmospheric Pressure Helium
Hao Yanpeng1, Han Yuying1, Huang Zhiming2, Yang Lin1, Li Licheng1
1. School of Electric Power South China University of Technology Guangzhou 510640 China; 2. Electric Power Research Institute China Southern Power Grid Co. Ltd Guangzhou 510663 China
Abstract Transitions of filamentary discharges, columnar discharges, partial diffuse discharges, or diffuse discharges covering the whole electrodes, and methods to distinguish filamentary discharges from columnar discharges were investigated based on the measurements of loop currents and light emissions. It was found that the discharge could be sustained when the applied discharge was adjusted to a lower one below the discharge inception voltage. In the case of a background air pressure of 40 Pa, in a 3 mm gas gap, at the frequencies of 10 kHz, 11.4 kHz or 14 kHz, a diffuse glow discharge covering the whole electrode initiated. With the discharge sustain voltage increasing from the lowest to the discharge inception voltage, transitions from a partial diffuse, a columnar to a diffuse discharge covering the whole electrodes occurred. While in the case of a background air pressure of 20 Pa, in a 3 mm gas gap, at the frequencies of 10 kHz, 12 kHz or 14 kHz, a diffuse glow discharge covering the whole electrode initiated. With the discharge sustain voltage increasing from the lowest to the discharge inception voltage, a transition from a columnar to a diffuse discharge covering the whole electrodes occurred. While a columnar discharge was generated at the discharge inception voltage with a background air pressure of 20 Pa, in a 2 mm gas gap, at the frequency of 18 kHz. And with the discharge sustain voltage increasing from the lowest to ones exceeding the discharge inception voltage, transitions from filamentary, columnar to diffuse discharges covering the whole area of electrodes occurred. Many small burrs on the current curve, no Townsend breakdowns, nor microdischarges that do not take place at the same locations could be used to distinguish the filamentary discharge.
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2018, Vol. 33 
