研究目的：全电缆贯通线已成为高速铁路建设中电力专业的设计标准，为解决伞电缆贯通线发生单相接地故障时电容电流大等问题，采用低电阻接地系统是好的解决方案。本文通过对低电阻接地系统的全面研究分析，提出采用低电阻接地系统的设计方法，为类似上程提供借鉴。
研究结论：通过论述低电阻接地系统的原理和特点，及对单相接地故障的分析，提出了铁路全电缆贯通线低电阻接地系统的设备参数选择和保护整定计算模式；分析了采用低电阻接地系统后，建筑物内设置总等电位联接的原冈和设计方法。
Research purposes: As the design standard，the entire cable power line is adopted in construction of high—speed railway．For solving the problem that the capacitance current is big when the single—phase grounding failure of entire cable power line occurs，the low resistance grounding system should be used．Based on the comprehensive analyses of the low resistance grounding system，this paper offers the design method for low resistance grounding system for providing the reference to the similar works．
Research conclusions: Through analyses of the principle and characteristics of low resistance grounding system and the single—phase grounding failure，this paper offers the calculation methods for selection of equipment parameters and protection setting of low resistance grounding system for entire cable power line for high—speed railway，analyzes the reasons for general potential bonding in buildings when low resistance grounding system is adopted and gives the design method for it．
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