考虑管状导体模型和轨中电流的钢轨电位计算

在直流牵引供电系统中普遍存在钢轨电位过高的问题,而现有钢轨电位计算仅考虑钢轨直流电阻模型,但是轨中电流包含大量1～50Hz和部分6倍频成份.将钢轨等效为管状导体模型,通过实测典型频率下的钢轨内阻抗,拟合确定P60钢轨等效管状导体参数;建立钢轨-地分布式参数模型,提出在多个牵引变电所、多车的复杂工况下考虑钢轨等效管状导体...

Calculation of Rail Potential Considering Tubular Conductor Model and Rail Current

In the DC traction power supply system,the problem of excessively high rail potential is common.However,the existing rail potential calculation only considers the rail equivalent resistance model,but the rail current contains a large number of 1~50 Hz and some 6-fold frequency components.In this paper,the rail was equivalent to the tubular conductor model,and the equivalent tubular conductor parameters of P60 rail were determined by measuring the internal impedance of the rail under typical frequency.The rail ground distributed parameter model was established,while the rail potential calculation method considering the rail equivalent tubular conductor model and the AC frequency spectrum of the current in the rail under the complex working conditions of multiple traction and mixing stations and multiple vehicles was proposed.The accuracy and effectiveness of the method were verified by laboratory and engineering cases.By calculating the longitudinal voltage drop of the rail and the rail potential of traction and mixing station under unilateral power supply,the 6-fold frequency component of the rail potential increased by 58.12%compared with the 6-fold component of the current in the rail.Through the effect of rail impedance frequency characteristics,the 6-fold frequency component in the rail potential component has a greater impact.