對稱分量法在求解電力變壓器非對稱短路電流中的應用
黃華
(正泰電氣股份有限公司，上海 201620)
摘 要：對稱分量法是電力系統中分析三相對稱系統不對稱運行的一種基本方法。介紹了對稱分量法的基本原理，通過在電力系統的局部短路故障處引入三相不對稱故障電壓源的思路，并應用電路的戴維南等值定理以及疊加定理，建立了基于某一相的各序等值網絡。通過對三種不對稱短路故障邊界條件的分析，制定了與故障類型相應的復合序網等值電路，大大方便了電力系統中非對稱短路電流的求解。實例證明了對稱分量法在求解電力變壓器各繞組不對稱短路電流過程的有效性。
關鍵詞： 電力變壓器；對稱分量法；非對稱短路電流；單相短路接地；兩相短路；兩相短路接地；序分量
中圖分類號：TM411+.2 文獻標識碼：B 文章編號：1007-3175(2022)05-0034-07
Application of Symmetrical Component Method in Solving Asymmetric
Short-Circuit Current of Power Transformer
HUANG Hua
（Chint Electric Co., Ltd, Shanghai 201620, China）
Abstract: 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.
Key words: power transformer; symmetrical component method; asymmetric short-circuit current; single phase short-circuit grounding;two phase short-circuit; two phase short-circuit grounding; sequence component
參考文獻
[1] 董哲，何煒. 交直流電力系統短路計算方法討論[J]. 電工電氣，2022(1) ：8-13.
[2] 楊奇. 發電廠短路計算在故障定位中的作用分析[J]. 電工電氣，2019(12) ：67-69.
[3] 黃華. 三繞組高阻抗電力變壓器聯合運行損耗的特征及溫升考核辦法探討[J] . 變壓器，2021，58(2) ：25-29.
[4] 湯涌，田芳，黃彥浩. 電力系統短路電流計算[M].北京：中國電力出版社，2015.
[5] 崔立君. 特種變壓器理論與設計[M] . 北京：科技文獻出版社，1996.
[6] 尹克寧. 變壓器設計原理[M] . 北京：中國電力出版社，2003.
