【摘要】 气体介质在重频(PRF)纳秒脉冲作用下的绝缘特性是高重频脉冲功率技术研发的基础。采用SPG200 重频纳秒脉冲电源,通过测量常压空气介质间隙(5、10、15、20mm),在不同重复频率(1、10、100、500、1000Hz)、不同电压幅值(60、80、100kV)作用下的击穿电压、电流、击穿延时及耐受时间,研究了空气的绝缘特性。结果显示重频脉冲常压下空气的击穿场强比单次脉冲时低得多;随击穿场强的增大,击穿时延、重频耐受时间均有减小的趋势,高PRF 时减小趋缓。低PRF 下的放电发展过程与单次时的放电发展过程差别不大,而与高PRF 下的不同。最后对纳秒脉冲下击穿时延及放电机理等进行了一些讨论。更多还原

【Abstract】 Insulating research of gas breakdown with nanosecond pulse is one applicable base of pulsed power technology. Used the nanosecond SOS-based pulse generator SPG200, breakdown characteristics of parallel-plate air gaps were investigated in an atmospheric pressure with single pulse and repetitive burst conditions (1, 10, 100, 500, 1000Hz), under variant applied pulsed voltage (60, 80, 100kV) and diverse gap distances (5, 10, 15, 20mm) respectively. Parameters such as applied pulsed voltage, breakdown current, observational breakdown delays and repetitively stressing time are obtained. Experimental results showed that the breakdown electric field of repetitive burst is much lower than that of single pulse. The observational breakdown delays and repetitively stressing times are gradually reduced with the increasing electrical field, whose distinctions seem to be big under lower PRF (pulse repetition frequencies), but more small and adjacent at higher PRF. Compared with relatively slim discrimination of low PRF bursts and single pulse, the discharge process under higher PRF bursts is different. Finally, some discussions are used to explain the breakdown delay time and gas-breakdown development process of nanosecond discharges.更多还原