摘要
受电弓通过分段绝缘器时,由于线路的不平整性,以及分段绝缘器自身结构特点,往往会产生电弧,且由于分段绝缘器两端存在数百上千伏高压,电弧往往难以熄灭,电弧停滞时间过长将对分段绝缘器造成烧蚀损伤,影响铁路安全运营。分段绝缘器中电弧的转移以及弧根的演变对其燃弧熄弧性能有重要影响。基于磁流体动力学理论(MHD),建立了受电弓过分段绝缘器空气电弧数学模型,通过对气压分布、受力大小、温度场、电压的分析,得到了受电弓过分段绝缘器弧根转移的根本原因。研究表明,电弧的转移主要是由于气流场和电磁力的作用,且电弧转移过程中对招弧角中段的烧蚀轻微,但由于电弧弧根到达顶端后停止大范围运动,使得招弧角顶端受烧蚀严重。
When the pantograph passing through the segmented insulator,due to the unevenness of the line and the structural characteristics of the segmented insulator,arc often generates,because of the hundreds voltage at both ends of the segmented insulator,the arc is always difficult to extinguish,stagnation time too long will cause ablation damage to the insulator and affect the safe operation of the railway system.The transferring of arc in the segmented insulator and the evolution of the arc root have an important influence on the arc burning extinguishing performance.Based on the theory of magnetohydrodynamics(MHD),a mathematical model of the arc of the pantograph passing the segmented insulator was established.Through the analysis of the pressure distribution,electromagnetic force,temperature field and voltage,the main reason of the arc transferring was obtained:the action of the airflow field and the electromagnetic force,and the ablation of the middle section of the arc angle is slight during the arc transfer process,however,the arc root reach the tip then stop the wide-range motion,causing the top of the arcing horn ablated severely.
作者
金文斌
JIN Wenbin(CRRC Changchun Railway Vehicles Co.,Ltd.,Changchun 130062,China)
出处
《机械与电子》
2019年第2期35-39,共5页
Machinery & Electronics
关键词
分段绝缘器
电弧
弧根运动
电弧演变
温度场
segmented insulator
arc
arc root motion
arc evolution
temperature field
