降雨对棒-棒短空气间隙交流击穿电压的影响

摘要

随着电压等级的提升,输电线路以及变电站雨闪事故越来越严重.目前国内外学者对于降雨条件下间隙放电特性的研究有了一定进展,但对于降雨条件下短空气间隙放电特性及机理没有明确结论.通过搭建降雨模拟试验平台,研究降雨强度、雨水电导率、降雨角度对棒-棒短空气间隙交流击穿电压的影响,其中降雨强度为1.8～5.4 mm/min,雨水电导率为200～3 000 μS/cm,降雨角度为0°和90°.分别测量2～10 cm间隙下的击穿电压.试验结果表明:降雨强度对棒-棒短空气间隙交流击穿电压的影响明显.降雨强度和雨水电导率的增加都会使交流击穿电压降低,同时,降雨角度也会对交流击穿电压产生影响.%With the updating of operating voltage level,the transmission line and substation accidents caused by rain are more and more serious.Although the discharge performance of air gap in rain has been investigated,there is no specific study result and mechanism of short air gap under rain at home and abroad.In this paper,the platform is designed to resemble the rainfall.The influences of rainfall intensity,rainwater conductivity and rainfall angle on AC breakdown voltage of short rodrod air gap are investigated.Rainfall intensity is set in the range of 1.8 ～5.4 mm/min and rainwater conductivity is set in the range of 200～3 000 μS/cm.Rainfall angles are 0° and 90°.AC breakdown voltage of rod-rod short air gap with the separation of 2～10 cm in rain conditions is measured.The experimental results show that rainfall intensity has the obvious effect on AC breakdown voltage.The AC breakdown voltage of short rod-rod air gap decreases with the increase of rainfall intensity and rainwater conductivity.Meanwhile,rainfall angle has effect on AC breakdown voltage of short rod-rod air gap.