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直供方式交流电气化铁道的钢轨电流分布特性及其形成地电位的分析方法,是交流电气化铁道关于阻性耦合理论方面的基本分析方法。本文较全面地分析了直供方式一个供电臂的钢轨电流的分布特性,由此从理论上导出钢轨漏泄电流形成地电位的计算方法。并论证了简化实用公式,进一步推导了公式中屏蔽系数的计算方法;阐明了钢轨对于地电位屏蔽作用的基本原理及其与钢轨对于电磁感应屏蔽作用在概念上的区别。
The rail current distribution characteristics and the method of forming the ground potential of direct supply-type AC electrified railway are the basic analysis methods for resistive coupling theory of AC electrified railway. In this paper, the distribution characteristics of rail current of a power supply arm in direct supply mode are analyzed in a comprehensive way, and the calculation method of ground potential of rail leakage current is theoretically derived. The simplification of practical formulas is also demonstrated. The calculation method of the shielding factor in the formula is further deduced. The basic principle of the shielding effect of the rail to the ground potential and the conceptual difference between the shielding effect of the rail and the electromagnetic induction are clarified.