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为揭示聚合物介质材料在连续能谱高能电子辐射下的深层放电规律特征,利用~(90)Sr放射源对聚四氟乙烯(PTFE)材料进行了不同条件的辐照实验。对采集的大量放电数据进行统计分析发现,电子辐照累积时间、入射电子通量以及温度都会影响介质的放电风险以及放电脉冲特征。高能电子对样品持续数天的累积辐照会降低介质自发放电的阈值条件,辐照后期放电更加频繁,但放电强度会减弱。入射电子通量越低时,放电风险越小;通量越高时,放电频率越高,高强度放电事件的发生概率也越大。温度主要通过影响介质的电导率而影响其深层放电特性,温度下降时介质本征电导率降低,充电电位和放电风险增加;一旦发生放电,放电电流脉冲的平均幅度也更大。
In order to reveal the characteristics of deep discharge of polymer dielectric under continuous energy spectrum high energy electron radiation, the irradiation experiment of polytetrafluoroethylene (PTFE) under different conditions was carried out using ~ (90) Sr radioactive source. The statistical analysis of the collected large amount of discharge data shows that the cumulative exposure time, incident electron flux and temperature affect the discharge risk of the medium and the characteristics of the discharge pulse. High-energy electron irradiation of the sample for several days cumulative irradiation will reduce the spontaneous discharge of the medium threshold conditions, the late discharge discharge more frequent, but the discharge intensity will be weakened. The lower the incident electron flux, the lower the discharge risk; the higher the flux, the higher the discharge frequency and the greater the probability of occurrence of high-intensity discharge events. The temperature mainly affects the deep discharge characteristics of the medium by affecting the conductivity of the medium. When the temperature decreases, the intrinsic conductivity of the medium decreases, and the charging potential and the discharge risk increase. Once the discharge occurs, the average magnitude of the discharge current pulse is also larger.