对称分量法在求解电力变压器非对称短路电流中的应用  

Application of Symmetrical Component Method in Solving Asymmetric Short-Circuit Current of Power Transformer

作　　者：黄华 HUANG Hua(Chint Electric Co.,Ltd,Shanghai 201620,China)

机构地区：[1]正泰电气股份有限公司,上海201620

出　　处：《电工电气》2022年第5期34-40,共7页Electrotechnics Electric

摘　　要：对称分量法是电力系统中分析三相对称系统不对称运行的一种基本方法。介绍了对称分量法的基本原理,通过在电力系统的局部短路故障处引入三相不对称故障电压源的思路,并应用电路的戴维南等值定理以及叠加定理,建立了基于某一相的各序等值网络。通过对三种不对称短路故障边界条件的分析,制定了与故障类型相应的复合序网等值电路,大大方便了电力系统中非对称短路电流的求解。实例证明了对称分量法在求解电力变压器各绕组不对称短路电流过程的有效性。The symmetrical component method is a fundamental method for analyzing the asymmetric operation of three-phase symmetrical system in power system.This paper elaborated the fundamental principle of the method of symmetrical components.In addition,it introduced the idea of the three-phase asymmetric fault voltage source to the local short-circuit fault of the power system.Moreover,it used the Thevenin equivalent theorem and superposition theorem of the circuit to structure the series phase equivalent network based on a certain phase.By analyzing the boundary conditions of three asymmetric short-circuit faults,this research formulated the equivalent circuit of the compound sequence network that matched the different fault types.Therefore,it helped to solve the problem of asymmetric short-circuit current.In conclusion,an example proves the effectiveness of the symmetrical component method in solving the asymmetrical short-circuit current process of each winding of a power transformer.

关 键 词：电力变压器 对称分量法 非对称短路电流 单相短路接地 两相短路 两相短路接地 序分量 

分 类 号：TM411.2[电气工程—电器]