220kV变压器中性点经隔直装置和限流电抗器接地应用  

Application of 220 k V Transformer Neutral Point Grounded via NCBD and Current-limiting Reactor

作　　者：刘起钟 魏巍[2] 张剑平 严天元 孙鹏程 

机构地区：[1]四川泸州川南发电有限责任公司,四川泸州646007 [2]国网四川省电力公司电力科学研究院,四川成都610072

出　　处：《四川电力技术》2015年第5期67-70,共4页Sichuan Electric Power Technology

摘　　要：为确保主变压器的安全运行,四川泸州川南发电有限责任公司在220 k V主变压器中性点加装隔直装置和限流电抗器,以大幅减小单相接地故障时流过主变压器的故障电流,并抑制近区直流输电线路不对称方式运行时流过主变压器中性点的直流电流,经过仿真计算分析,加装隔直装置和限流电抗器后对线路保护、主变压器保护、发电机保护均不会造成较大影响。In order to ensure the safe operation of main transformer,Sichuan Luzhou Chuannan Power Generation Co. Ltd installs neutral DC current blocking device（ NCBD） and current limiting reactor in neutral point of 220 k V main transformer to significantly reduce the single- phase fault current when occurring single- phase earth fault in high- voltage side of main transformer,and suppress the DC current flowing through neutral point of main transformer when the nearby HVDC transmission lines is not in symmetry operating mode. The simulation calculation and analysis show that the influence on line protection,main transformer protection and generator protection are not obvious after installing NCBD and current- limiting reactor in neutral point of 220 k V main transformer.

关 键 词：主变压器 中性点 隔直装置 限流电抗器 

分 类 号：TM471[电气工程—电器]