本《鼠笼式和绕线转子感应电动机及同步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，因此读者可以选择必要的设备以获得足够的电动机保护。本指南主要涉及三相整体式马力电机的保护，仅在特别说明的特殊情况下提及两相电机。 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，本文提供了足够的关于目标、应用和设置原理的背景材料，使读者能够评估各种保护形式的需求，并在大多数情况下选择和正确应用合适的设备。

This application guide for the relay protection of squirrel-cage and wound-rotor induction motors and synchronous motors presents a review of the generally accepted forms of motor protection and summarizes the use of relays and devices, singly and in combination, so the reader may select the necessary equipment to obtain adequate motor protection. The guide is concerned primarily with the protection of three-phase integral horsepower motors and refers to twophase motors only in special instances where specifically indicated. This guide is not a standard and does not purport to detail the protective requirements of all motors in every situation. Its recommendations are of a general nature, designed to cover the usual or typical motor installations. Sufficient background material on objectives,applications, 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 equipment for most situations.