Current pulses caused by streamers in sphere-sphere electrode system

Electrostatics 2015

物理学;数学

Chirkov, V.A.^1 ; Samusenko, A.V.^1 ; Stishkov, Yu K.^1

Physics Department, St. Petersburg State University, Ulianovskaia 1, St.-Petersburg

198504, Russia^1

关键词: Electric current pulse;    Growing velocity;    Low temperature plasmas;    Negative streamers;    Positive streamers;    Sphere-sphere electrodes;    Streamer corona;    Strong electric fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/646/1/012042/pdf
DOI  :  10.1088/1742-6596/646/1/012042

来源: IOP

【 摘 要 】

Streamer is a channel of a low temperature plasma growing due to ionization in the area of the strong electric field at the tip of the channel. Streamer investigation presents a technically highly complicated task due to fleetingness of the process: growing velocity is 106-107m/s and characteristic duration is 10-8-10-7s. The electric current pulse registration is a moderate method for investigating so fast process. However, the major part of streamer current investigations refers to low voltage range (about 103-104V) and short streamers length range 10-2-10-1cm. Also positive streamers are usually considered and there is a lack of information about current pulses caused by negative streamers. Both positive and negative streamers and their interaction are considered in the present paper. A multibranch streamer corona emerging at voltages above 250 kV and in long gaps (above 40 cm) was investigated.