本指南提供了有关额定电压为1 kV至52 kV的金属封闭气体绝缘变电站设备（通常为室内设备）的规划、选择、规范和生命周期管理（安装、调试、运行、维护、停用）的信息。本指南旨在补充IEEE标准C37中的信息。20.9TM，并通过向用户、指定人和买方提供指导，为变电站中包含的其他中压设备或装置提供信息。 本指南不包括其他指南或标准所涵盖的户外变电站设备，如户外断路器、户外开关或重合闸。

This guide provides information regarding the planning, selection, specification, and life cycle management (installation, commissioning, operation, maintenance, decommissioning) of "metal-enclosed gas insulated substation" (MEGIS) equipment (typically indoor) rated 1 kV to 52 kV. This guide is intended to supplement the information found in IEEE Std C37.20.9 and provide information for other medium voltage equipment or apparatus contained in the substation by providing guidance to users, specifiers, and purchasers. This guide does not cover outdoor substation equipment covered by other guides or standards such as outdoor circuit breakers, outdoor switches, or reclosers.