分布式电源对反时限过电流保护的影响  

Impact on inverse-time over-current protection by distributed generation

作　　者：刘玉娟 张伟[1,2] 侯健敏[1] LIU Yu-juan ZHANG W ei HOU Jian-min(Jiangsu Engineering Research C entre on M eteorological Energy U sing and C on trol,N U IS T ,Nanjing 210044,C h in a Research C entre for R enew able Energy G eneration Engineering of M inistry of E d ucation,H ohai U niversity,Nanjing 210098,C hina)

机构地区：[1]南京信息工程大学江苏省气象能源利用与控制工程技术研究中心,南京210044 [2]河海大学可再生能源发电技术教育部工程研究中心,南京210098

出　　处：《信息技术》2016年第11期5-7,11,共4页Information Technology

基　　金：国家自然科学基金项目(71503136);江苏省大学生实践创新训练计划项目(201510300070)

摘　　要：分析了反时限过电流保护的动作特性,对一个10k V配电网的反时限过电流保护的起动电流和时间特性系数进行了整定计算,计算了分布式电源接入配电网后短路电流和动作时限的变化,对比不含分布式电源的计算结果,得出结论:分布式电源的接入,对上游的故障影响较小;分布式电源下游发生故障时,对下游的故障短路电流起助增作用,将使其动作速度变快,而上游保护的动作时限将变长,作为远后备保护可能失去意义,严重的情况下,可能会拒动。The characteristics ol the inverse-time over-current protection are analyzed. The starting currentand the time characteristic coefficient ol 10kV distribution system are calculated. The fault current resultsol distribution system with and without distributed generation are calculated and compared. The results areas following： the distributed power supply has little effect. The access ol distributedgeneration has littleeffect on the upstream fault. When the downstream fault occurs, the fault current in the upatreamprotection can be reduced and the current in the downstream protection can be enlarged. So, the time delayof the upstream relay becomes longer and loses meaning as far-back protection.

关 键 词：分布式电源 反时限过电流保护 动作时限 

分 类 号：TN86[电子电信—信息与通信工程]