DL/T 2249-2021 in English

This standard provides technical guidelines for the setting and coordination of protective relays in flexible direct current transmission systems. It outlines the principles and methods for determining protective settings to ensure the safe and stable operation of such systems. The document covers key aspects including system configuration, fault analysis, and relay coordination. It also specifies the requirements for protective devices and their integration within the overall power system. The standard aims to establish a consistent approach for protection settings across different projects and applications. Additionally, it addresses the challenges associated with the unique characteristics of flexible direct current systems, such as voltage source converter behavior and harmonic issues. The content is structured to support engineers and technicians in the design and implementation of effective protection schemes.