Experimental Study on Wear Performance of Rigid Catenary-Pantograph System with Direct Current
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摘要:
为了认识刚性接触网系统接触线和受电弓滑板异常摩耗的机理、提高刚性接触网系统摩擦元件的使用寿命,根据地铁刚性接触网系统的工作条件,使用环-块式载流摩擦磨损试验机,对刚性接触网系统的载流摩擦磨损性能进行了试验研究. 试验电流为0、400 A (DC),滑动速度为60 km/h,接触法向力为30 N,滑动距离为900 km. 在试验过程中测量了弓网之间的滑动摩擦因数、滑板磨损量、滑板温度、电弧电流和电压等参数,计算了滑板的磨损率和电弧能量. 试验结果表明:试验得到的滑板磨损率与实际地铁线路刚性接触网滑板的磨损率接近;直流电流对滑板的磨耗和温度有严重的影响,有电流时(400 A)滑板磨损率和温度分别是无电流时滑板磨损率和温度的53.0倍和7.4倍;引起滑板严重磨耗的原因主要是电弧烧蚀和黏着磨损.
Abstract:In order to understand the abnormal wear mechanism of the contact wire and the pantograph strip in the rigid catenary system, and to improve the service life of its friction elements, tests were carried out on the current-carrying friction and wear performance of the rigid catenary system with a block-on-ring current-carrying friction and wear tester. The test parameters were set as: the test current of 0, 400 A (DC), sliding speed of 60 km/h, the contact normal force of 30 N, and sliding distance of 900 km. During the tests, the sliding friction coefficient between the pantograph strip and catenary wire, the wear volume and the temperature of the pantograph strip, arc current and voltage were measured, and the wear rate of the pantograph strip and arc energy were calculated. The test results show that the tested wear rate of the pantograph strip is close to the one for actual subway lines. The DC current has a serious impact on the wear and temperature of the pantograph strip. The wear rate and temperature of the pantograph strip with DC 400 A are about 53.0 times and 7.4 times higher than those without electric current, respectively. The serious wear of the pantograph strip is mainly caused by arc ablation and adhesive wear.
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Key words:
- wear /
- electric contact /
- rigid catenary /
- contact wire /
- pantograph strip
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表 1 接触线的化学成份和物理性能
Table 1. Physical parameters and chemical compositions of contact wire
成份 质量分数/% 铜 > 99.70 银 0.10 氧 < 0.03 杂质 < 0.03 密度/ (g•cm−3) 8.96 硬度/HB 90 表 2 滑板材料的化学成份和物理性能
Table 2. Chemical compositions and physical parameters of strip
成份 质量分数/% 铜 24.49 碳 71.62 杂质 3.89 密度/(g•cm−3) 2.30 硬度/HS 100 -
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