Experimental research on radiated electroma gnetic noise of pantograph arc
In recent years, with the continuous increasing of electric locomotive running speed, electromagnetic noise of pantograph arc gets more and more serious and has become a kind of security risk of electric railway's operation. To study the electromagnetic noise and suppression methods of pantograph arc, an electromagnetic noise experimental system was developed. The experimental system is composed of an echoic chamber, pantograph arc generator and pantograph arc detection system. With the experimental system, 64 groups of radiation electromagnetic noise experiments were conducted under different contact force, contact current and sliding speed conditions. The experimental materials are metal impregnation carbon slide and Cu contact wire respectively. The radiated electromagnetic noise of pantograph arc is mainly electric field noise. Most of the electric field noise is distributed in the frequency ranges from 30MHz to 500MHz. And the maximum interference is between 30MHz and 80 MHz. With the increase of contact current, the distribution of the electric field noise becomes denser and the disturbance level increases. With the increase of contact pressure or sliding speed, the distribution of the electric field noise firstly becomes thinner and then denser.