低气压对棒-板间隙工频放电特性影响研究

Research on Effects of Low Pressure Condition on AC Discharge Characteristics of Rod-plane Gap

为研究低气压对棒-板间隙工频放电特性影响,利用低气压放电试验平台对1~20 kPa气压范围内200~500 mm棒-板间隙工频放电进行了试验研究,分析了工频50%击穿电压U_(50%)与气压P及间隙距离d的关系;以及气压对放电通道外形的影响。研究结果表明:在1~20 kPa气压范围内不同间隙距离下U_(50%)-P曲线均有饱和趋势,开始出现饱和趋势的拐点随间隙距离增大向低气压方向移动且拐点处击穿电压U_(50%)和间隙距离与气压乘积Pd之间存在函数关系。随气压升高放电通道由低亮度"间断状"逐渐收细、变亮为高亮度"连续状",曲折现象逐渐显著。研究成果为进一步开展低气压下长间隙放电研究提供参考。

To research the effects of low pressure condition on AC discharge characteristics of rod-plane gap,laboratory investigations of AC discharge performance was carried out in the test system for 200 - 500 mm rod-plane gaps within 1 - 20 kPa,and analyzed the relationship between 50% AC discharge voltage U50%and pressure P as well as gap length d,and how pressure affects on the appearance of discharge channel. The results show that,within 1 - 20 k Pa,U50%-P curves of different gaps all have saturation trends,and the inflection point moves left with the increases of gap length. There is a functional relationship between U50%and Pd at the inflection point.With the increases of pressure,the discharge channel changes from low brightness and discontinuous shape to thin,high brightness and continuous shape,and the characteristic of zigzag is more remarkable. These results have reference value for the further study of long gap discharge under low pressure.