直流输电中换流变压器零序过流保护的探讨  

Investigation on Converter Transformer's Zero-Sequence Over-Current in HVDC System

作　　者：刘家军 罗明亮 徐玉洁 

机构地区：[1]许继电气股份有限公司,河南许昌461000

出　　处：《中国电力》2014年第6期22-25,共4页Electric Power

摘　　要：针对银川极1换流变压器在空充时Y0/Y换流变零序过流误动导致开关跳闸这一事故展开思考,通过理论分析发现,换流变压器网侧发生接地故障时,流经Y0/Y换流变压器中性点和Y0/Δ换流变压器中性点零序电流的大小有很大差异。同时,建立仿真模型并以南方电网在许继集团的换流变保护装置RTDS试验中数据和波形为佐证。综合分析后得出:对于Y0/Y换流变压器而言,其零序过流保护没有投入的必要。An investigation is made on the accident of switch trip in Yinchuan Pole 1 converter transformer caused by zero-sequence over-current malfunction of Y0/Y converter transformer during charging period. It was found that a big difference exists between the zero-sequence current that goes through the Y0/Y converter transformer neutral point and the one that goes through the Y0/A converter transformer neutral point when the line-side earth fault occurs. A model simulation is made based on the data and wave shape of XJ GROUP＇s converter transformer protective device-RTDS used in CSG＇s project. It is concluded through synthetic analysis that the zero-sequence over-current protection is not necessary for Y0/Y converter transformer.

关 键 词：高压直流输电 换流变压器 零序过流保护 接地故障 零序电抗 RTDS 

分 类 号：TM774[电气工程—电力系统及自动化]