IEC 61378-3:20 15为用户提供了与工业和HVDC换流变压器相关的特定主题的信息，这些变压器的设计、构造、测试和运行条件不同于电力系统中使用的传统变压器。此外，IEC 61378本部分的目的是为制造商提供构成IEC 61378-1和IEC 61378-2中使用的原理基础的技术背景。IEC 61378的这一部分旨在补充而不是取代或取代电力变压器应用指南IEC 60076-8，因为其中包含的许多一般原则同样适用于换流变压器。第二版取消并取代了2006年出版的第一版，构成了技术修订。与上一版相比，此版本包括以下重大技术变更: a)修订损失条款，以反映IEC 61378-1第二版引入的变化； b)增加关于工业和高压直流输电应用换流变压器设计审查的新条款； c)添加用于连接到电压源转换器的变压器的内容； d)参考CIGRE JWG A2/B4.28关于HVDC变压器的工作。

IEC 61378-3:2015 provides information to users about specific topics related to industrial and HVDC converter transformers with design, construction, testing and operating conditions differing from conventional transformers used in power systems. In addition, it is the aim of the present part of IEC 61378 to provide manufacturers with the technical background that forms the basis for the principles used within IEC 61378-1 and IEC 61378-2. It is intended that this part of IEC 61378 is used to supplement and not replace or supersede the application guide for power transformers, IEC 60076-8, since many of the general principles contained within it are equally applicable to converter transformers. This second edition cancels and replaces the first edition published in 2006 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) revision of clause on losses to reflect the changes introduced by the second edition of IEC 61378-1;
b) addition of a new clause about design review of converter transformer for both industrial and HVDC applications;
c) addition of content for transformer connected to voltage source converters;
d) reference to the work of CIGRE JWG A2/B4.28 on HVDC transformers.