考虑离子动力学的 C₄F₇N 放电模型及群参数研究

This study aims to investigate the influence of complex ion kinetic processes, such as electron detachment, on the discharge characteristics of C₄F₇N, in order to overcome the limitations of existing electron kinetics models, considering only ionization and attachment processes under high-pressure conditions. We first conduct pulsed Townsend experiments on C₄F₇N under a wide range of reduced electric field and various pressure conditions. Through detailed analysis of the waveforms, a discharge model for C₄F₇N considering ion kinetics is established. Subsequently, we develop a theoretical model for the spatiotemporal evolution of electron avalanche in C₄F₇N. By combining genetic algorithms to fit current waveforms, the reaction rate coefficients of C₄F₇N are obtained for pressures ranging from 60 Pa to 5 kPa. Finally, a method for calculating effective ionization rate coefficients considering ion kinetics is proposed, and the insulation performance of C₄F₇N is reevaluated. The results show that the model incorporating ion kinetic processes can more accurately reflect the insulation characteristics of C₄F₇N.