论文部分内容阅读
由于高速铁路弓网离线存在随机性,离线可能发生在交流电压的任意时刻,所以需要研究离线时刻对弓网电弧特性的影响,以系统地研究弓网电弧机理。为此,基于在实验室中搭建的弓网离线模拟实验平台,进行了大量的随机离线放电实验,采集了不同离线时刻的电弧电压、电弧电流、相对光强波形及数据,并进行了统计分析。结果表明:静态弓网离线时的电弧燃弧时间在15~25 ms之间;在电压幅值上升区间(1~5 ms,11~15 ms)离线时的电弧相对光强较大,同时电弧电压的谐波含量较大;动态弓网离线时的电弧燃弧时间在1~8 ms之间;在电压幅值上升区间离线时的电弧燃弧时间要大于在电压幅值下降区间离线时的电弧燃弧时间,同时电弧电压的谐波含量较小。总之,离线时刻对静态及动态离线电弧的电气特性、燃弧时间、相对光强、谐波含量等均有不同程度的影响。
Because of the randomness of the high-speed railway bow net, the off-line may occur at any moment of the AC voltage. Therefore, it is necessary to study the influence of the off-line moment on the arc characteristics of the bow net in order to systematically study the arc mechanism of the bow net. Therefore, a large number of random off-line discharge experiments were carried out based on the off-line simulated experimental platform of bow net in the laboratory, and the arc voltage, arc current, relative light intensity waveform and data at different off-line time were collected and statistically analyzed . The results show that the arc arcing time is about 15-25 ms when the static arch wire is off-line, and the arc intensity is relatively large when the voltage amplitude is rising (1-5 ms, 11-15 ms) The harmonic content of the voltage is relatively large; the arcing time when the dynamic bow wire is offline is between 1 and 8 ms; the arc arcing time when the voltage amplitude rising interval is offline is greater than that when the voltage amplitude is decreasing Arc arcing time, while the arc voltage harmonic content is smaller. In short, the off-line time has a varying degree of influence on the electrical characteristics of static and dynamic off-line arcs, arcing time, relative light intensity and harmonic content.