适用于发电站使用的多相感应电动机，包括以下电动机:机架尺寸大于440系列、鼠笼式、单速或多速、水平或垂直结构和成型绕线。

Applies to polyphase induction motors intended for use in power-generating stations, including the following: frame size larger than 440 series, squirrel-cage type, single speed or multi-speed, horizontal or vertical construction and form wound.