电缆为主的10 kV配电网中性点经小电抗接地的可行性研究  

Feasibility Study on Neutral Point Grounding Through Small Reactor in Cable-based 10kV Distribution System

作　　者：李晨辉 李红岩 赵振华 张军浩 LI Chenhui;LI Hongyan;ZHAO Zhenhua;ZHANG Junhao(Ningbo Yongcheng Power Distribution System Construction Co., Ltd., Ningbo Zhejiang 315000, China;State Grid Ningbo Yinzhou Power Supply Company, Ningbo Zhejiang 315100, China)

机构地区：[1]宁波甬城配电网建设有限公司,浙江宁波315000 [2]国网浙江宁波市鄞州区供电公司,浙江宁波315100

出　　处：《浙江电力》2017年第11期2-11,共10页Zhejiang Electric Power

摘　　要：城市配电网中电缆线路的大范围使用,导致10 k V配电系统的电容电流急剧增加,单相接地故障及其引起的相间短路故障也越来越多。近年来,中性点经小电抗接地方式在500 k V,220 k V及110 k V电压等级电网中取得了良好的应用。为了克服现有中压配电网中性点接地方式的问题,研究了电缆出线为主的10 k V配电网在中性点经小电抗接地方式下的故障特性,通过仿真和结果对比,提出了电缆为主的10 k V配电网中性点经小电抗接地的优势和可行性。The wide use of the cable line in urban distribution system leads to the dramatically increase of capacitive current in10kV power distribution system,bringing out more and more single?-phase ground faults and the induced interphase short?-circuit faults.In recent years,the grounding of the neutral point through small reactor has been successfully applied in500kV,220kV and110kV power grids.Aiming at overcoming the problem of the grounding of the neural point in the existing medium-voltage distribution system,this paper investigates the fault features of the neural point grounding though small reactor in the cable outlet-based distribution system.The advantage and feasibility of neural point grounding though small reactor in the cable-based10kV distribution system are presented by the simulation and results comparison.

关 键 词：10kV配电网 小电抗接地 单相接地故障 

分 类 号：TM862[电气工程—高电压与绝缘技术]