超高压电缆网络中接地系统的电流分布研究  

Analysis of ground fault current distribution along EHV cable lines

作　　者：曹志强[1,2] 赵子玉[1] 万丽丽[3] 

机构地区：[1]上海交通大学,上海200030 [2]上海市电力公司电缆输配电公司,上海200072 [3]上海市电力公司沪北供电分公司,上海200072

出　　处：《华东电力》2009年第11期1854-1859,共6页East China Electric Power

摘　　要：超高压电缆护套换位及接地保护方式直接关系电网的安全运行,使用双侧消去法建立电路模型,开发了一套电缆接地短路电流计算软件包,结合上海市超高压电缆工程进行了电缆线路单相、两相、三相接地短路电流及沿线电流分布、危险电压、负载电流下的护套感应电压及环流等计算。目标集中在研究大桥上及隧道中是否可以使用现有的共用接地系统,进而为电缆接地系统的优化设计提供依据。The current distribution of three phases under faulty conditions is affected by position-changing and sheath grounding of cables,which can not be settled by traditional sequence component method.To solve the problem,the double-sided elimination method was used to set up an equivalent circuit and develop a software package for calculating the ground fault current distribution along EHV cable lines.Based on an EHV cable engineering project of Shanghai,the single,double,and three phases to ground fault current and its distribution along cable lines, the dangerous voltage, and the induced voltage and circular current in cable sheaths under load current were calculated and analyzed.

关 键 词：高压电缆 电缆护套 电流分布 

分 类 号：TM757[电气工程—电力系统及自动化]