考虑铁心结构的三相变压器励磁涌流和角型绕组环流分析  

Analysis of inrush current and delta winding circulating current in three-phase transformers with different core structures

作　　者：柴济民[1,2] 郑玉平 潘书燕[3,4] CHAI Jimin;ZHENG Yuping;PANG Shuyan(School of Electrical and information Engineering,Changzhou Institute of Technology,Changzhou 213032,China;College of Energy and Electrical Engineering,Hohai University,Nanjing 210098,China;NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;State Key Laboratory of Smart Grid Protection and Control,Nanjing 211106,China)

机构地区：[1]常州工学院电气与信息工程学院,江苏常州213032 [2]河海大学能源与电气工程学院,江苏南京210098 [3]南瑞集团公司(国网电力科学研究院),江苏南京211106 [4]智能电网保护和运行控制国家重点实验室,江苏南京211106

出　　处：《电力科学与技术学报》2024年第2期91-100,共10页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金委—国家电网公司智能电网联合基金(U1866603);国家电网公司总部科技项目(5100-202340030A-1-1-ZN)。

摘　　要：基于三相组式、五柱式和三柱式铁心结构变压器的磁路特征和运行方程,首先,提出运用星形侧零序电流和电压来拟合角型绕组环流的数值方法,并进一步研究不同铁心结构变压器的角型绕组环流和励磁涌流的特点;然后,进行软件仿真和现场录波以验证该数值方法的有效性,可判断三相组式和五柱式变压器的各相绕组差流即为对应相的励磁涌流,而三柱式变压器某相的绕组差流并不是对应相的励磁电流;最后,进一步的理论分析与仿真验证表明,在3类铁心结构的变压器从星形侧空载合闸时,星形侧任意两相的线电流之差可以认为是这两相等效磁路的励磁涌流之差。研究结论可以为不同铁心结构三相变压器的励磁涌流识别提供依据。The magnetic circuit characteristics and operating equations of transformers with three different core structures:three-phase banked,five-limb,and three-limb are utilized.A numerical method is proposed to fit the circulating current in the delta windings using the zero-sequence current and voltage on the wye side.Through this approach,a deeper understanding of the characteristics of current in the delta windings and magnetizing inrush current in transformers with different core structures is gained.To validate the effectiveness of the proposed numerical method,software simulations and field waveform recordings are conducted.The results show that for three-phase banked and five-limb transformers,the differential current in each phase winding corresponds directly to the magnetizing inrush current of that phase;however,for three-limb transformers,the differential current in a phase winding is not directly correspond to its excitation current.Further theoretical analysis and simulation verification indicate that during no-load closing from the wye side of transformers with these three types of core structures,the difference between the line currents of any two phases on the wye side can be regarded as the difference in magnetizing inrush current between the two equivalent magnetic circuits.This finding provides a new basis for identifying the magnetizing inrush current of three-phase transformers with different core structures.

关 键 词：变压器 励磁涌流 环流 零序分量 

分 类 号：TM771[电气工程—电力系统及自动化]