关键词: 工频干扰, 绝缘烧损, 回流通道, 列车运行安全

Abstract: The poor traction return channel will lead to track circuit power frequency and harmonic interference, track insulation burning, bring harm to the safety of train operation. This paper focus on three typical cases of power frequency interference and insulation burning accident on site, analyzes through centralized monitoring voltage curve fluctuation and dynamic detection of power frequency interference curve, and conducts on-site inspection and testing of abnormal positions. It is found that the unreasonable setting of return channel in the station and the improper connection mode of the section boosting cable will cause the obstruction of traction return channel. Combined with the actual scene and engineering experience, three different solutions for the single line semi-automatic block station, double line sections and EMU operation semi-automatic block section are proposed. The solution can greatly reduce the emergency braking problems caused by excessive power frequency interference, insulation burning and harmonic interference, so as to ensure the safety of train operation.

Key words: power frequency interference, track insulation burning, return channel, safety of train operation