Affiliations: Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao, Liaoning, China
Correspondence:
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Corresponding author: Fengyi Guo, Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao, Liaoning, China. E-mail:[email protected]
Abstract: With the continuous increase of electric locomotive
running speed, electromagnetic noise of pantograph arc gets more and more
serious and has become a kind of safety risk of electric railway's
operation. With the self-developed electromagnetic noise experimental
system, 66 groups of radiation electromagnetic noise experiments were
carried out by changing contact pressure, contact current and sliding speed.
The experimental circuit was powered by a 220VAC low current source. The
experimental materials are immersed copper-carbon slide and Cu contact wire
respectively. Electromagnetic noise of pantograph arc mainly distributes in
30-570 MHz, and the noise in 30-60 MHz band is obviously higher than that of
background. With the increase of frequency, the electromagnetic noise
firstly decreases, then increases, and finally decreases to background
noise. When the speed is lower than the critical condition of generating
pantograph arc, the electromagnetic noise is independent of contact pressure
and the amplitude is very small. When the speed is between 30 km/h and
40 km/h, the noise reduces with the increase of contact pressure. When the
speed is higher than 50 km/h, the electromagnetic noise becomes intensive and
fluctuates with the increase of contact pressure. It can be used to further
research on the suppression methods of the electromagnetic noise emission.
