浅谈变压器穿越电流分析计算方法

降压变压器二次侧发生各种形式短路时,在一次侧会引起一定的穿越电流。当变压器连接方式不同,二次侧短路形式不同时,一次侧引起的穿越电流分布也不同。对称分量法是解决这一问题的重要方法。现行各种版本的供电技术教材对该部分内容介绍过于简单,一般直接给出结论,忽略了必要的分析和具体的推导过程。针对上述问题,简要介绍了对称分量法的基本概念,并举例说明了利用对称分量法求解变压器穿越电流值的具体过程。

Discussion on Analysis and Calculation Method of Through Fault Currents in the Primary Winding of Transformer

Once the step-down transformer suffered from the secondary short circuit,such as single-phase,two phase earth fault,there would be through fault currents induced in the primary winding.Due to the different connecting schemes of transformer and the forms of short circuit fault,accordingly the through fault currents distribution is also different.The symmetry component method is the commonly used method adopted by power system fault calculation.But the introduction to the contents in the various versions of related textbooks is too simple to understand with ease for students,especially for non-power major ones.To solve the above problems,a necessary analysis and derivation process detailed are given by an applicable example in this paper.