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为研究直流接地极对电气化铁路的影响,基于CDEGS软件建立了云—广±800 kV特高压直流输电工程鱼龙岭接地极及临近京广电气化铁路的仿真模型,分析了牵引变电站供电臂沿线轨道电位分布,计算了流经电气化铁路牵引变压器的直流电流,并研究了影响该直流电流大小的各个因素。分析结果表明,在同极性单极大地返回运行工况下,流过牵引变压器的直流平均电流为19.7 A,已超过普通电力变压器允许限值;流经牵引变的直流电流与接地极入地电流同向变化,接地极离铁路轨道越近,引起的直流电流越大,且接地极位于供电臂中垂线上时引起的直流电流最小。研究结果为直流输电工程接地极及铁路轨道设计提供了参考。
In order to study the influence of DC grounding electrode on electrified railway, a simulation model of Yulongling grounding electrode of Yun-Guang ± 800 kV UHVDC transmission project and electrification railway near Jinguang Railway was established based on CDEGS software. The trajectory of power supply arm along the traction substation was analyzed. Potential distribution, the DC current flowing through the traction transformer of the electrified railway was calculated, and various factors affecting the magnitude of the DC current were studied. The analysis results show that the average DC current flowing through the traction transformer is 19.7 A under the condition of unipolar return to the same polarity, exceeding the allowable limit of ordinary power transformers. The DC current flowing through the traction transformer and the ground- Current changes in the same direction, the closer the ground electrode is to the railroad track, the larger the DC current is and the smaller the DC current is caused when the ground electrode is located in the vertical line of the power supply arm. The results provide a reference for the design of HVDC grounding pole and railway track.