单电源多级串供型输电线路距离保护误动原因分析及改进

TM77; 结合一起单电源多级串供型输电线路距离保护误动的事例,详细探讨了保护误动的原因,分析指出:输电线路在保护安装处近区发生区外单相接地故障时,由于分布电容的影响,判断故障方向的负序方向元件将落入正向区内,引起保护误动.为解决上述问题,在传统负序方向元件判据的基础上提出了一种基于正序电流和负序电流之间相位关系的故障方向判据,并给出了正方向的动作区间.经PSCAD/EMTDC仿真,验证了该方向判据不受过渡电阻的影响,解决了保护安装处近区发生区外故障时距离保护误动的问题....

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Published in电力自动化设备 Vol. 41; no. 2; pp. 179 - 185
Main Authors 王宏宇, 李永丽, 张云柯, 王伟康, 曾治安, 曹磊
Format Journal Article
LanguageChinese
Published 天津大学 智能电网教育部重点实验室,天津 300072%国网重庆市电力公司,重庆 400011%国网河北省电力有限公司,河北 石家庄 050021 10.02.2021
Subjects
多级串供
分布电容
负序方向元件
距离保护
继电保护
单电源
Online AccessGet full text
ISSN1006-6047
DOI10.16081/j.epae.202011023

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Abstract TM77; 结合一起单电源多级串供型输电线路距离保护误动的事例,详细探讨了保护误动的原因,分析指出:输电线路在保护安装处近区发生区外单相接地故障时,由于分布电容的影响,判断故障方向的负序方向元件将落入正向区内,引起保护误动.为解决上述问题,在传统负序方向元件判据的基础上提出了一种基于正序电流和负序电流之间相位关系的故障方向判据,并给出了正方向的动作区间.经PSCAD/EMTDC仿真,验证了该方向判据不受过渡电阻的影响,解决了保护安装处近区发生区外故障时距离保护误动的问题.
AbstractList TM77; 结合一起单电源多级串供型输电线路距离保护误动的事例,详细探讨了保护误动的原因,分析指出:输电线路在保护安装处近区发生区外单相接地故障时,由于分布电容的影响,判断故障方向的负序方向元件将落入正向区内,引起保护误动.为解决上述问题,在传统负序方向元件判据的基础上提出了一种基于正序电流和负序电流之间相位关系的故障方向判据,并给出了正方向的动作区间.经PSCAD/EMTDC仿真,验证了该方向判据不受过渡电阻的影响,解决了保护安装处近区发生区外故障时距离保护误动的问题.
Author 王伟康
张云柯
李永丽
曾治安
曹磊
王宏宇
AuthorAffiliation 天津大学 智能电网教育部重点实验室,天津 300072%国网重庆市电力公司,重庆 400011%国网河北省电力有限公司,河北 石家庄 050021
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CAO Lei
ZHANG Yunke
ZENG Zhian
WANG Hongyu
WANG Weikang
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分布电容
负序方向元件
距离保护
继电保护
单电源
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Title 单电源多级串供型输电线路距离保护误动原因分析及改进
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