牵引变电所地返回电流及接地网电位抬升研究

摘要

The earth-return current flowing through grounding grid in traction substation and ground potential rise (GPR) are obtained after analyzing the traction return current distribution in rail and earth. In PSCAD/EMTDC, a simplified traction system is modeled to study the earth-return current and GPR sensitivity to rail-to-earth leakage conductance, earth resistivity and grounding grid resistance. The simulation results show that rail-to-earth leakage conductance and grounding grid resistance have a more obvious influence on earth-return current and GPR while earth resistivity has a limited influence.This work is supported by Natural Science Foundation of Hebei Province (No. E2011502097).%分析了交流电气化铁路中牵引回流在钢轨和地中的分布,推导了流经牵引变电所接地网的地返回电流和接地网电位抬升.在PSCAD/EMTDC环境下搭建牵引供电系统仿真模型,研究了钢轨大地间泄漏电导、大地电阻率和牵引变电所接地网接地电阻对地返回电流及地网电位抬升的影响.研究结果表明,地返回电流和地网电位抬升受钢轨大地泄漏电导和接地网接地电阻影响较大,受大地电阻率影响较小.