电测与仪表2017，Vol.54Issue(19)：123-128,6.
±500 kV换流变压器电容隔直装置保护动作分析
Analysis on protective action of capacitive DC current blocking device for ±500 kV converter transformer
摘要
Abstract
In order to isolate the DC magnetic bias current , the capacitive DC current blocking device has been installed in the neutral point of converter transformers .Based on the protective action of capacitive DC current blocking device of the ±500 kV HVDC project , the occurring process of the accident , and the protection action principle and the internal struc-ture of the capacitive DC current blocking device are introduced in this paper .The reason of the accident is analyzed .The analysis results show that the protection configuration of the DC blocking device is unreasonable .When the DC bias current is large, the thyristor circuit for capacitor protection is continuously turned on , which causes the device to lose DC current isolation effect .At last , in view of the above problem , the preventive measures are presented .关键词
换流变压器/电容隔直装置/直流偏磁/饱和告警Key words
converter transformer/capacitive DC current blocking device/DC magnetic bias/excitation saturation alarm分类
信息技术与安全科学引用本文复制引用
刘青松,伍衡,周海滨,邓军,张晋寅,梁晨..±500 kV换流变压器电容隔直装置保护动作分析[J].电测与仪表,2017,54(19):123-128,6.基金项目
中国南方电网公司科技项目(CGYKJXM00000001) （CGYKJXM00000001）
