小电源并网对110kV变压器中性点保护的影响  

Influence of Small Power Connected on Neutral Protection of 110kV Transformer

作　　者：陈许卫 朱杰 邱志勤[3] CHEN Xu-wei;ZHU Jie;QIU Zhi-qin(Hangzhou Tonglu Power Supply Bureau,Tonglu 311500,China;Hangzhou Yuhang Power SupplyBureau,YuHang 311100,China;Ertan Hydropower Development Co.Ltd.,Chengdu 610000,China)

机构地区：[1]桐庐县供电局,浙江杭州311500 [2]余杭供电局,浙江杭州311100 [3]二滩水电开发有限责任公司,四川成都610000

出　　处：《电气开关》2018年第6期98-99,103,共3页Electric Switchgear

摘　　要：110kV变电站主变中、低压侧有小电源并网运行,当110kV进线故障时,若主变中性点保护定值整定不合理则会造成在线路重合闸前主变各侧开关已跳闸或无条件重合将小电源强行拉入系统。针对这种问题,文章对主变中性点保护的定值整定和配合进行了改进。In the transformer of110kV substation,there is a small power supply on the low-voltage bus or middle-voltage bus.When the110kV line fails,if the set value of the neutral point protection is set unreasonably,it will cause the switch at each side of the main transformer to be tripped before the reclosing or Unconditionally coincident pull small power into the large system.In view of this kind of question,the article has carried on the improvement to the definite value setting and cooperation of the transformer neutral point protection.

关 键 词：小电源 110KV主变 中性点保护 

分 类 号：TM77[电气工程—电力系统及自动化]