Electrical Characterization of Helium Plasma Jet in a Needle-to-Ring Electrode Configuration

• 1、Chongqing University, The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, 400044
• 2、State Grid Corporation, Zhenjiang Power Co., Taizhou Branch Co., 318000

Abstract：In this paper, To determine the effects of the factors such as electrode position, velocity and voltage on electrical characteristics of needle-ring atmosphere helium plasma jet, a jet device was designed in this study. The experimental results showed that: the stable positive current "multi-pulse" could be achieved, with three pulses at most and the larger the H valve (distance between ground electrode and nozzle) is, the earlier the positive current "multi-pulse" appeared; with the increase of H value, the amplitude of positive current impulse becomes higher; when H was 28 mm, in the stage of positive multi-pulse, displacement current in bulge form presented at the negative direction, and with the decrease of H value, the negative current pulse gradually appeared. Furthermore, the change of helium flow had little effect on the power of atmospheric pressure plasma jet under fixed voltage, however the power increased with the increase of H value; under the same voltage, with the increase of helium flow, jet length firstly increased to the maximum value, then decreased and stabilized; when H value increased, jet length presented a decreasing trend. We have also proposed a mechanism of the above experimental phenomena.

keywords： high voltage discharge plasma needle-ring structure multi-pulse electrode position electrical characteristics discharge mechanism

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