IEC 62751-1:20 14+A1:2018规定了计算用于高压直流（HVDC）应用的电压源转换器（VSC）的换流阀功率损耗的一般原则，与转换器拓扑无关。标准中的几个条款也可用于计算动态制动阀（如果使用）中的功率损耗，并作为计算STATCOM安装的阀功率损耗的指南。该合并版本由第一版（2014年）及其修正案1（2018年）组成。因此，除本出版物外，无需下令修订。

IEC 62751-1:2014+A1:2018 sets out the general principles for calculating the power losses in the converter valves of a voltage sourced converter (VSC) for high-voltage direct current (HVDC) applications, independent of the converter topology. Several clauses in the standard can also be used for calculating the power losses in the dynamic braking valves (where used) and as guidance for calculating the power losses of the valves for a STATCOM installation. This consolidated version consists of the first edition (2014) and its amendment 1 (2018). Therefore, no need to order amendment in addition to this publication.