本标准适用于变电站、发电厂以及用电和转换设备安装中使用的设备和功能的功能编号和首字母缩写的定义和应用。从历史上看，设备功能编号通常代表单个或组件设备。这些数字和首字母缩略词也可用于表示多功能设备或软件程序中的单个功能，其中可能包含保护和非保护功能。

This standard applies to the definition and application of function numbers and acronyms for devices and functions used in electrical substations, generating plants, and in installations of power utilization and conversion apparatus. Historically, device function numbers have typically represented individual or component devices. These numbers and acronyms may also be used to represent individual functions within multi-function devices or software programs, and that may contain both protection- and non-protection-oriented functions.