高压内置变压器涌流对母联零序过流保护的影响及对策  

Influence and Countermeasures of Inrush Current of Transformer with Built-in High Voltage Winding on Zero Sequence Overcurrent Protection of Bus Tie Circuit-Breaker

作　　者：翁汉琍[1,2] 康涛 郭祎达 贾永波 李振兴[1,2] 黄景光[1,2] WENG Hanli;KANG Tao;GUO Yida;JIA Yongbo;LI Zhenxing;HUANG Jingguang(Hubei Provincial Collaborative Innovation Center for New Energy Microgrid,China Three Gorges University,Yichang,Hubei 443002,China;College of Electrical Engineering&New Energy,China Three Gorges University,Yichang,Hubei 443002,China;Xinyang Power Supply Company,State Grid Henan Electric Power Company,Xinyang,Henan 464000,China)

机构地区：[1]新能源微电网湖北省协同创新中心(三峡大学),湖北宜昌443002 [2]三峡大学电气与新能源学院,湖北宜昌443002 [3]国网河南省电力公司信阳供电公司,河南信阳464000

出　　处：《南方电网技术》2023年第3期75-84,共10页Southern Power System Technology

基　　金：国家自然科学基金资助项目(52077120)。

摘　　要：高压绕组内置型高阻抗变压器(高压内置变压器)因改变内部绕组的排布顺序,使其涌流问题更加突出,母联零序过流保护因其空载合闸产生的高幅值零序涌流面临较高的误动风险,威胁电网的安全运行。结合母联零序过流保护的整定原则,揭示了高压内置变空载合闸涌流工况下母联零序过流保护误动的机理。基于零序涌流与故障零序电流波形特征的差异性,并考虑电流互感器(current transformer,CT)饱和对电流波形特征的影响,提出基于零序电流符号序列变化特征的母联零序过流保护防误动闭锁判据。基于仿真模型对保护误动机理和所提判据的有效性进行验证。The problem of inrush current becomes more prominent by changing the arrangement order of the inner windings of the transformer with built-in high voltage winding.The zero-sequence over-current protection of bus tie circuit-breaker is faced with a high risk of maloperation because of the high amplitude zero-sequence inrush current due to the unloaded transformer energizaiton,which threatens the safe operation of the power grid.Combining with the setting principle of zero-sequence overcurrent protection of bus tie circuit-breaker,the maloperation mechanism of the protection under inrush current conditions of unloaded energization of the transformer with built-in high voltage winding is revealed in this paper.Based on the difference of waveform characteristics between zero-sequence inrush current and fault zero-sequence current,and considering the influence of saturation of current transformer(CT),the restraint criterion of zero-sequence overcurrent protection against maloperations applying the variation characteristics of symbol sequence of zero-sequence current is proposed.The maloperation mechanism of the protection and the validity of the proposed criterion are verified by simulation tests.

关 键 词：高压内置变压器 零序过流保护 符号序列变化特征 零序涌流 CT饱和 

分 类 号：TM41[电气工程—电器]