标题：Analysis of Earth Currents in a Medium-Voltage Distribution Network with Three-Core Cables
作者：Liang Zhengzhong; Zhu Guofang
作者机构：[Liang Zhengzhong; Zhu Guofang] Shandong Univ, Sch Elect Engn, Jinan, Peoples R China.
会议名称：IEEE Innovative Smart Grid Technologies - Asia (ISGT ASIA 2015)
会议日期：NOV 03-06, 2015
来源：2015 IEEE INNOVATIVE SMART GRID TECHNOLOGIES - ASIA (ISGT ASIA)
关键词：Circuit analysis; fault current; power distribution faults; PSCAD;; three-core power cables
摘要：In this paper a simplified zero-sequence model of a medium-voltage network with three-core cables is proposed. The model is then used to analyze the distribution of earth currents in the network when a phase-to-ground fault occurs in the line between consumer substations. Then this paper studies how this distribution changes when the resistance of earth grids of consumer substations change and when fault location changes. Result shows that a large proportion of earth current flows back to the earth grid of source substation through sheaths and armors of cables instead of flowing to the earth grid of the nearest consumer substation. And this proportion is hardly affected by the resistance of earth grids of consumer substations or by fault location. The theoretical result is testified by simulation using PSCAD.