接触网直流融冰载流温升试验研究

Experimental Study on Current and Temperature Distribution of Overhead Contact System when DC De-Icer in Use

接触网覆冰是影响行车安全的重要因素之一。本文提出一种利用电能转化为热能来融冰的小容量接触网直流融冰装置及其载流温升现场试验方案。选取直流融冰装置作为电源、一定长度上行接触网和下行接触网作为试验回路,在接触网试验回路上加载不同档位和时长的电流进行温升试验;在接触网试验回路的承力索、接触线和主要零部件上安装温度监测装置和电流监测装置,监测其电流分布和温度变化情况,并对试验前后的回路直流电阻和关键连接点的线夹力矩值进行测量;通过分析得出直流融冰装置投入后接触网温升可控性,并对试验方案可行性进行验证。

The icing on Overhead Contact System(OCS)is one of the factors affecting safe railway operation. This paper proposes a small-capacity DC de-icer for OCS based on the principle using electric energy to convert into heat energy to melt ice and a test scheme on site about OCS current and temperature distribution when OCS is energized. The DC de-icer is selected as the power supply, and the upper Overhead Contact Line(OCL) and the lower OCL of a certain length are used as the test circuit. The different current and duration is loaded on the test OCL circuit for temperature rise test;the temperature monitoring device and current monitoring device are installed on the load-bearing cables, contact line and main fittings and parts of the OCL test circuit to monitor the current distribution and temperature change, and the DC resistance of the OCL test circuit before and after the test and the torque value of the clamps at the key connection points are monitored. Through the analysis of the above measured data, the controllability of the OCL temperature rise after the DC de-icer is loaded and the feasibility of the test scheme are obtained.