IEC TS 62271-318:2024 EXV包含国际标准及其扩展版本(EXV)。IEC官方标准的扩展版本仅提供英文版本，为用户提供了标准的全面内容。IEC TS 62271-318:2024 EXV包括对IEC TS 62271-5:20 24的引用内容。 IEC TS 62271-318:2024规定了气体绝缘金属封闭开关设备的要求，其中绝缘至少部分通过大气压力下的空气以外的绝缘气体或气体混合物获得，用于额定电压包括100 kV及以上的直流电，用于室内和室外安装。本文件包括服务条件、评级、设计和施工要求的规则。本文件定义了直流开关设备开发和制造的测试要求和通过型式和常规测试的证明标准。出于本文件的目的，术语“DC GIS”和“DC开关设备”用于“DC气体绝缘金属封闭开关设备”。本规范适用于高压直流输电系统的线路换流器（LCC）和电压源换流器（VSC）。本文件所涵盖的直流气体绝缘金属封闭开关设备由单个部件组成，这些部件旨在直接连接在一起，并且只能以这种方式运行。如果适用，本文件补充和修订了适用于构成DC气体绝缘金属封闭开关设备的各个部件的各种相关文件。

IEC TS 62271-318:2024 EXV contains both the international standard and its extended version (EXV). This extended version of the official IEC Standard is available in English only and provides the user with a comprehensive content of the Standard. IEC TS 62271-318:2024 EXV includes the content of the references made to IEC TS 62271-5:2024.

IEC TS 62271-318:2024 specifies requirements for gas-insulated metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas or gas mixture other than air at atmospheric pressure, for direct current of rated voltages including and above 100 kV, for indoor and outdoor installation. This document includes rules for service conditions, ratings, design, and construction requirements. Test requirements and criteria for proof for passing type and routine tests are defined in this document for development and manufacturing of DC switchgear. For the purpose of this document, the terms "DC GIS" and "DC switchgear" are used for "DC gas-insulated metal-enclosed switchgear". This specification is applicable for both Line Commutated Converter (LCC) and Voltage Sourced Converter (VSC) for HVDC systems. The DC gas-insulated metal-enclosed switchgear covered by this document consists of individual components intended to be directly connected together and able to operate only in this manner. This document completes and amends, if applicable, the various relevant documents applying to the individual components constituting DC gas-insulated metal-enclosed switchgear.