投运多台换流变压器时和应涌流波形特点  

Characteristics of corresponding inrush current waveform when multiple transformers are put into operation

作　　者：房雨浓 FANG Yunong(Northeast Electric Power University,Jilin 132011,China)

机构地区：[1]东北电力大学,吉林吉林132011

出　　处：《电气应用》2023年第11期99-106,共8页Electrotechnical Application

摘　　要：空投变压器会导致附近正在运行的变压器出现和应涌流,而和应涌流会导致出现误动作和相应的过电压、过电流现象。以单台换流变压器和应涌流原理为基础,进一步针对多台换流变压器同时投运进行研究。在研究投运换流变压器数量的基础上,分析换流变压器容量、投运时间以及线路阻抗的不同对和应涌流产生的影响,并通过改变合闸相角以及并联电阻等方式降低和应涌流。最后结合国内某实例工程,证明所提方案的切实有效性。Airdrop transformers can cause reactive inrush currents in nearby transformers,which can lead to misoperation and corresponding overvoltage and overcurrent phenomena.Based on the principle of single converter transformer and corresponding inrush current,combined with the internal structure of converter transformers,further study the impact of multiple converter transformers operating simultaneously on corresponding inrush current.Based on the study of the number of transformers put into operation,the impact of different transformer capacity,operation time,and residual magnetism on the corresponding inrush current is analyzed.The corresponding inrush current is reduced by changing the closing phase angle and parallel resistance.Finally,the effectiveness of the proposed scheme is demonstrated through a domestic example project.

关 键 词：换流变压器 和应涌流 多台并联 系统阻抗 合闸角度 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM41