Mechanism of High-Speed Railway Interference on Power Cables of Adjacent Normal-Speed Railway
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摘要: 高速铁路由于列车速度快、牵引功率大，且高速运行时持续取流，对与其邻近的普速铁路沿线敷设的电力电缆产生了明显的电磁干扰. 为此，通过对感性耦合和阻性耦合机理分析，研究高速铁路对电力电缆感应电压的干扰机理；运用CDEGS软件建立高速铁路对电力电缆电磁干扰仿真模型，总结电力电缆感应电压影响因素；基于计算结果对仿真模型进行验证. 结果表明：在邻近情况下，电力电缆感应电压与牵引负荷、电力电缆、土壤结构参数有关；其中，平行长度、负荷电流、土壤电阻率和短路电流对电力电缆感应电压有显著影响；高速铁路与普速铁路之间应根据电缆长度的不同设置合理的防护距离，且采用中点接地和单端接地方式能有效地降低电力电缆感应电流.Abstract: Due to high speed, large traction power and continuously receiving current in operation, high-speed railways generate obvious electromagnetic interference on the power cables of adjacent normal-speed railways. Based on the analysis of inductive coupling and resistive coupling mechanism, the interference from high-speed railways on the induced voltage of power cables was analyzed, and CDEGS software was used to establish the electromagnetic simulation model of high-speed railway interference to the power cables of adjacent normal-speed railways, and the factors affecting the induced voltage of power cables are summarized. The simulation model was verified on the basis of the calculation results. The results show that the induced voltage of power cables near high-speed railways is related to the traction load, parameters of power cable and soil structure. Of them, the parallel length, load current, soil resistivity and short-circuit current have significant influence on the induced voltage of power cables. The protection distance between high-speed railways and normal-speed railways should be set according to different cable lengths. Middle grounding and single-terminal grounding can effectively reduce the induced current of power cables.
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图 1 高速铁路对邻近普速铁路电力电缆电磁干扰示意
Figure 1. Schematic diagram of interference from high-speed railways on power cable of adjacent normal-speed railways
图 7 高速铁路与电力电缆相对位置（单位：m）
Figure 7. Relative location of high-speed railway and power cable (unit: m)
表 1 导线模型电气参数
Table 1. Wire model electrical parameters
导线型号 电阻/
（Ω•km−1）标称截
面积/mm2计算截
面积/mm2CTMH-150 0.1852 150 151.00 JTMH-120 0.2420 120 116.99 LGJ-300/50 0.0964 铝 300，
钢 50铝 299.54，
钢 48.82LGJ-120/20 0.2496 铝 120，
钢 20铝 115.67，
钢 18.82TJ-95 0.2000 95 93.27 
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表 2 三芯电力电缆模型参数
Table 2. Three-core power cable model parameters
参数 缆芯 护套 铠装 内半径/mm 0 10.9 51.5 外半径/mm 5.00 11.05 53.50 相对电阻率 1.0 1.0 1.6 厚度/mm 5.9 2.8 2.8 电阻率/（Ω•m） 1014 1014 1014 相对介电常数 1 1 1
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表 3 地电位比较值
Table 3. Ground potential comparison value
距泄流点距离/m 计算值/V 仿真值/V 误差/% 5 9.349 9.655 3.17 10 8.224 8.475 2.96 15 7.566 7.809 3.11 20 7.099 7.330 3.15 25 6.738 6.955 3.12
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表 4 短路电流对电力电缆感应电流的影响
Table 4. Effect of short circuit current on induced current
短路电流/kA 感应电流/A 5 1.576 10 2.676 15 3.457 20 4.009 25 4.408
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表 5 不同防护距离时电缆的感应电压
Table 5. Induced voltage at different protective distances V
防护距离/m 电缆长度/km 0.5 1.0 1.5 2.0 2.5 3.0 50 72.38 79.51 90.52 115.98 155.28 200.09 100 59.84 65.19 73.69 92.75 122.63 156.78 150 52.25 56.78 63.86 79.30 103.68 131.72 200 46.94 50.80 56.93 69.91 90.45 114.15 250 42.80 46.17 51.63 62.83 80.52 100.94 300 39.42 42.43 47.39 57.23 72.65 90.54 350 36.57 39.28 43.80 52.52 66.07 81.85 400 34.11 36.57 40.71 48.51 60.50 74.50 450 31.96 34.21 38.04 45.06 55.74 68.24 500 30.05 32.12 35.67 42.01 51.56 62.78 550 28.33 30.25 33.54 39.32 47.91 58.03 600 26.77 28.55 31.58 36.83 44.55 53.62
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