中文摘要：

新型换流变压器纵向不对称故障计算是其配套继电保护与自动装置设计的基础。基于新型换流变压器正常数学模型和添加法建立网络方程的原理，结合新型换流变压器的有向图，根据新型换流变压器纵向不对称故障的类型，通过修改故障支路对原网络方程贡献的方法来计算新型换流变压器各种纵向不对称故障。实际算例验证了该计算方法的正确性，该算法对于解决各种复杂多绕组变压器纵向不对称故障计算问题具有普遍意义。

英文摘要：

Longitudinal and asymmetric fault calculation for the new converter transformer is the base of its relay pro- tection and design of automatic device. Based on the normal mathematical model of the new converter transformer and the principle of additive process which can build the network equation, and combined with the digraph of the new con- verter transformer, this paper amended the correlative contribution of faulty branches to calculate all kinds of longitu- dinal and asymmetric faults in the new converter transformer according to the types of longitudinal and asymmetric faults. Calculation results validate the correctness of the method designed by this paper which is of universal signifi- cance in solving all kinds of the complicated longitudinal and asymmetric faults calculation problems of transformers.