Discharge mechanisms in liquid nitrogen with thermally induced gas bubbles

11th European Conference on Applied Superconductivity

Blaz, M.^1 ; Kurrat, M.^1

University of Braunschweig, Institute for High Voltage Technology and Electrical Power Systems, Schleinitzstraße 23, Braunschweig

38106, Germany^1

关键词: Discharge mechanisms;    Discharge voltages;    Electrode arrangement;    Negative streamers;    Propagation mechanism;    Sub-cooled liquid nitrogen;    Thermally induced;    Utilization factor;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/3/032006/pdf
DOI  :  10.1088/1742-6596/507/3/032006

来源: IOP

【 摘 要 】

Discharge voltages of a sphere-plane electrode arrangement in subcooled liquid nitrogen stressed with impulse voltages were investigated. Tests were performed with and without thermally generated bubbles between the electrodes. Polarity effects could be observed at higher gaps and lower utilization factors. These effects are explained by the occurrence of positive and negative streamers, which have different propagation mechanisms. The measured discharge voltage with thermally generated bubbles is compared to calculated values using Paschen's law.