IEC TR 63401-4:20 22（E）是一份技术报告，重点关注IBR的故障行为以及大规模集成IBR的电网中现有继电保护的性能。 本文件包括: 目前电网规范中的IBR故障电流要求，包括对称和不对称故障期间正序和负序系统中的有功和无功电流要求。 IBR的故障电流行为，包括不同IBR拓扑和控制方案中瞬态和基频的电流分量。 现有继电保护与IBRs大规模集成的适应性，包括距离保护、选相器、方向继电器和过流保护的性能。

IEC TR 63401-4:2022 (E), which is a technical report, focuses on the fault behaviour of IBRs and performances of the existing relay protection in grids with large-scale integration of IBRs.
This document includes:
The IBR fault current requirements in present grid codes, including the requirements of active and reactive currents in positive- and negative-sequence systems during symmetrical and unsymmetrical faults.
Fault current behaviour of IBRs, including the current components in transient and fundamental frequency in different IBR topology and control schemes.
Adaptability of existing relay protection with the large-scale integration of IBRs, including the performances of distance protection, phase selector, directional relay and over-current protection.