小电流接地系统单相接地机理分析

Analysis of single-phase grounding mechanism in small current grounding system

主要从配电网单相接地的等效电路入手，分析了中性点不接地系统或经消弧线圈接地系统单相接地时，各相对地电压和中性点位移电压的变化特性，基波零序电流和五次谐波零序电流的分布规律，为接地相和接地线路的判别提供了理论依据。

Starting from the equivalent circuit of distribution network with grounded single phase, this paper analyzes the variation characteristics of the phase-to-ground voltages and the neutral displacement voltage, the distribution laws of the fundamental zero-sequence current and the sib order harmonic zero sequence current in non-ground neutral systems or Peterson coil ground systems with single-phase earth faults, thus providing the theoretical basis for discrimination of ground phase and lines.