| 引用本文: | 申洪明,宋璇坤,黄少锋,刘颖,肖智宏,韩柳,陈炜,张祥龙.换相失败对TA传变特性及换流变差动保护的影响分析[J].电力自动化设备,2018,(4): |
| SHEN Hongming,SONG Xuankun,HUANG Shaofeng,LIU Ying,XIAO Zhihong,HAN Liu,CHEN Wei,ZHANG Xianglong.Effect of commutation failure on transfer characteristics of CT and differential protection of converter transformer[J].Electric Power Automation Equipment,2018,(4): |
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| 摘要: |
| 详细研究了换相失败对电流互感器传变特性的影响机理，分析指出换相失败期间注入交流系统中大量的直流分量可能导致电流互感器暂态饱和。从理论上分析了换相失败造成直流分量过大的原因。然后综合分析了在电流互感器、换流变压器同时饱和时换相失败对换流变压器差动保护的影响，结果表明换流变压器发生内部故障时差动保护可能拒动，但发生外部故障时保护一般能可靠闭锁。最后从继电保护和换流器拓扑结构层面提出了相应的解决措施。 |
| 关键词: 高压直流输电 换相失败 电流互感器 换流变压器 差动保护 继电保护 |
| DOI：10.6081/j.issn.1006-6047.2018.04.032 |
| 分类号:TM77 |
| 基金项目: |
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| Effect of commutation failure on transfer characteristics of CT and differential protection of converter transformer |
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SHEN Hongming1, SONG Xuankun1, HUANG Shaofeng2, LIU Ying1, XIAO Zhihong1, HAN Liu1, CHEN Wei1, ZHANG Xianglong1
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1.State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209, China;2.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
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| Abstract: |
| The effect of commutation failure on transfer characteristics of CT(Current Transformer) is analyzed, which shows that plenty of DC components during the commutation failure may lead the CT saturation. Then the reason why the commutation failure brings plenty of DC components is theoretically analyzed. The effect of commutation failure on differential protection of converter transformer during the simultaneous saturation of CT and converter transformer is analyzed, and the results show that the differential protection of converter transformer may refuse to operation when internal fault occurs, while be reliably blocked when external fault occurs. Some countermeasures are proposed from aspects of relay protection and converter topologies. |
| Key words: HVDC power transmission commutation failure electric current transformers converter transformer differential protection relay protection |
