《鼠笼式和绕线转子感应电动机继电保护应用指南》对电动机保护的普遍接受形式进行了回顾，并总结了继电器和装置的单独使用和组合使用，以使读者能够正确选择必要的设备，以获得足够的电动机保护。本指南主要用于保护三相整体式马力电机，仅在特殊情况下和特别说明的情况下提及单相或两相电机。如果由于电机的尺寸或电机故障的后果，电机安装足够重要，以证明保护系统的具体设计是合理的，则该方法尤其有用。它还提供必要的信息，以判断此类特定设计是否存在安全或经济原因。本指南不是一个标准，并不打算详细说明每种情况下所有电机的保护要求。 其建议具有一般性，旨在涵盖通常或典型的电机安装。然而，本文提供了有关目标、应用和设置原理的充分背景材料，以使读者能够评估各种形式的保护需求，并在大多数情况下选择和正确应用合适的保护设备。

The application guide for relay protection of squirrel-cage and wound-rotor induction motors presents a review of the generally accepted forms of motor protection and summarizes the use of relays and devices, singly and in combination, to enable the reader to properly select the necessary equipment to obtain adequate motor protection. The Guide is prepared primarily for the protection of three-phase integral-horsepower motors and refers to single- or two-phase motors only in special instances and only where specifically indicated. It is especially useful where the motor installation is sufficiently important, due to either its size or the consequences of motor malfunction, to justify specific design of the protective system. It also provides the information necessary to judge whether there are safety or economic reasons for such a specific design. This Guide is not a Standard and does not purport to detail the protective requirements of all motors in every situation. Its recommendation is of a general nature designed to cover the usual or typical motor installation. Sufficient background of material on objectives, application, and setting philosophy is presented, however, to enable the reader to evaluate the need for various forms of protection and to select and properly apply suitable protective equipment for most situations.