弓网电弧电场噪声特性影响因素

Influence factors of electric field noise of pantograph arc

为揭示工况参数对弓网电弧电场噪声特性的作用规律,利用自行研制的弓网电弧电磁噪声实验系统,采用单因素实验法,改变供电电压、回路电流、功率因数、运行速度、接触压力等实验条件,开展了91组弓网电弧辐射电场噪声实验.在30~60 MHz频段内,弓网电弧电场噪声幅值较大,高于背景噪声及其它频段电场噪声.31~44 MHz频带内的电场噪声超过限值,会严重影响调频收发信机的正常工作.提高供电电压,电场噪声的等效场强呈现增大趋势;列车感性负载越少,功率因数越接近1,则电场噪声越小.

In order to study the relationships between experimental conditions and electric field noise of pantograph arc, 91 groups of experiments were carried out with self-developed pantograph arc electromagnetic noise experimental system. The experimental conditions such as power supply, loop current, power factor, sliding speed and contact pressure was changed by using single factor experimental method. In the 30~60 MHz frequency band, the electric field noise amplitude is larger. Also it is higher than background noise and the noise in the other frequency band. The electric field noise in the 31~44 MHz frequency band is higher than the limit value defined in the standard. It will seriously affect the performance of FM transceiver. The equivalent field strength of the noise increases with increasing power supply. And the electric field noise becomes smaller and smaller when the power factor is close to 1.