列车过分相引起过电压的分析及治理

Analysis and Treatment of Overvoltage caused by Train Passing through Phase Break

时速200 km以上电气化铁路接触网采用关节式电分相,列车通过电分相时引起的过电压会造成机车放电间隙击穿或受电弓烧蚀等事故,危及电气化铁路的运营安全。本文在介绍3种列车自动过电分相方式的基础上,根据过分相时受电弓位置的变化建立列车通过关节式电分相的模型,对过分相不同阶段的过电压进行分析,并采用阻容保护措施对过分相过电压进行抑制,效果良好。

Phase break with overlap is adopted for electrified railway under speed over 120 km, the overvoltage caused by the train passing through the phase break induces the accidents of puncture of locomotive discharging gap or burning of pantograph, endangers the safe operation of electrified railways. By illustration of three modes of train＇s passing through the phase break, by establishing of model for passing through phase break with overlap depending on variation of pantograph positions during phase breaking, the paper analyzes the overvoltage occurred at different phases. It shows that the resistance-capacitance protection measures taken for suppression of overvoltage caused by the passing through the phase break are effective.