不同海拔地区棒–板间隙临界半径的试验研究

在棒–板间隙的正极性操作冲击放电试验中,放电电压受到棒端部半径大小的影响。为得到放电电压随棒端部半径变化的规律,选择棒电极端部为半径19~475 mm的球面,得到2~5 m间隙距离下棒–板间隙的放电电压。试验数据表明,棒端部半径增大到某临界值时,放电电压开始明显增大,该临界值称为临界半径。提出新的临界半径计算方法,并分析临界半径现象产生的原因。为了解不同海拔下棒–板间隙临界半径的变化,分别在北京(海拔50 m)和西藏羊八井(海拔4 300 m)开展了相同棒–板间隙的临界半径试验研究,得到两地的临界半径。试验结果表明,临界半径的大小与棒–板间隙距离和所处海拔有关。

Experimental Studies on Critical Radius of Rod-Plane Air Gaps at Different Altitudes

During the tests of positive switching impulse discharge voltage of rod-plane air gap,the radius of the end of rod electrode would influences the discharge voltage.To obtain the regularity of discharge voltage varying with the radius of the end of rod electrode,the spherical surface with radii from 19 mm to 475 mm are chosen as the end of the rod electrode to achieve the discharge voltage of rod-plane air gaps while the air gaps are from 2 m to 5 m.Testing data show that when the radius of the end of rod el...