基于磁-力耦合场的单相电源变压器短路试验研究  

Research on Short-Circuit Test of Single-Phase Power Transformer Based on Magnetic-Force Coupling Field

作　　者：漆伟 QI Wei(Chongqing Rail Transit(Group)Co.,Ltd.,Chongqing 401120,China)

机构地区：[1]重庆市轨道交通(集团)有限公司,重庆401120

出　　处：《电工技术》2021年第21期132-135,共4页Electric Engineering

摘　　要：以一台200 kVA配电变压器为研究对象,探索了采用单相电源进行变压器承受短路能力试验的可能性,建立变压器三维有限元模型,并进行短路试验验证。利用该模型计算三相短路时不同激励方式下绕组的短路电流与短路电动力,分析比对不同工况下绕组的短路电流及电动力分布特性。研究结果表明,当低压侧三相短路、高压侧三相激励或单相激励时,其短路电流与过零合闸相电动力基本相同,相间短路力相互影响很小,证明了采用单相电源替代三相电源进行短路试验的可行性。Taking a 200 kVA distribution transformer as the research object,the possibility of using single-phase power supply to test the short-circuit withstand ability of the transformer is explored.The three-dimensional finite element model of the transformer is established,and the short-circuit test is verified.The model is used to calculate the short-circuit current and short-circuit electric force of the windings under different excitation modes,and the short-circuit current and electric force distribution characteristics of the windings under different working conditions are analyzed and compared.The research results show that when the low-voltage side three-phase short circuit,the high-voltage side three-phase excitation or single-phase excitation,the short-circuit current is basically the same as the zero-crossing closing phase electromotive force,and the inter-phase short-circuit force has little influence on each other,which proves that the single-phase power supply can be used to replace the three-phase power for short-circuit test.

关 键 词：变压器 有限元 短路电流 短路电动力 

分 类 号：TM406[电气工程—电器]