Study on GIC algorithm of railway traction power supply system under action of late time HEMP
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摘要: 高空核爆电磁脉冲晚期效应（E3）会引起地磁场剧烈变化并形成地面感应电场。感应电场等效为激励源与地面长距离导体和大地构成回路，产生地磁感应电流 （GIC）。GIC可引起牵引供电系统中变压器直流偏磁，从而严重威胁牵引供电系统的安全运行。本文基于平面波理论、分层大地电导率模型并结合牵引供电系统的电路模型，提出E3作用下的牵引供电系统GIC算法，并以带回流线的直接供电方式的铁路牵引供电系统为例，首次计算了系统GIC情况。结果表明，该供电方式下牵引供电系统中的GIC远大于系统中变压器等设备的耐受值，为进一步研究E3作用下牵引供电系统效应及我国铁路设备选型、灾害防治等提供支撑。Abstract: The late effect of high-altitude electromagnetic pulse (E3) will cause dramatic changes in the Earth's magnetic field and form a ground induced electric field. The induced electric field is equivalent to forming a loop between the excitation source and the ground long-distance conductor and the Earth, generating a geomagnetic induction current (GIC). GIC can cause DC bias of the transformer in the traction power supply system, thereby seriously threatening the safe operation of the traction power supply system. Based on the plane wave theory, the layered Earth conductivity model and the circuit model of the traction power supply system, this paper proposes the GIC algorithm of the traction power supply system under the action of E3, and takes the railway traction power supply system with return line direct power supply as an example. Calculating the system GIC situation shows that the GIC in the traction power supply system under this power supply mode is far greater than the withstand value of the transformer and other equipment in the system. The study provides support for further research on the effect of the traction power supply system under the action of E3, the selection of our domestic railway equipment, and disaster prevention.
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图 3 基于分层大地电导率模型与平面波理论的E3感应电场计算流程
Figure 3. Calculation process of E3 induced electric field based on layered earth conductivity model and plane wave theory
图 5 带回流线的直接供电方式牵引供电系统算例
Figure 5. Calculation example of direct power supply traction power supply system with return line
图 7 不同大地电导率模型下接触网GIC
Figure 7. Catenary GIC under different ground conductivity models
图 8 接触网GIC计算结果
Figure 8. Geodetic conductivity model and catenary GIC calculation results
表 1 带回流线的直接供电方式牵引供电系统算例参数
Table 1. Example parameters of traction power supply system with return line
equipment name equipment type DC resistance overhead catenary CTM-120 0.186 Ω/km carrier cable JTM-95 0.244 Ω/km return line LBGLJ-240 0.121 Ω/km rail P-50 0.032 Ω/km traction transformer D11-QY-40000/220 Rqy=0.0197 Ω on board transformer TBQ4-4760/25 Rdc=0.5165 Ω traction transformer grounding resistance — Rjd1=0.21 Ω rail grounding resistance — Rjd=0.163 Ω 
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表 2 带回流线的直接供电方式牵引供电系统GIC计算结果
Table 2. GIC calculation results of traction power supply system with return Line
variable parameter parameter value GIC (Ijc) minimum and maximum value/A θ 0° [−8.73，90.7] 45° [−6.17，64.13] 90° 0 D 5 km [−3.72，38.64] 15 km [−7.88，81.89] 25 km [−8.73，90.7]
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