本应用指南介绍了公认的交流电机保护方法。它根据类型、尺寸和应用确定并总结了充分保护电机所需的功能。 本指南中的建议基于典型安装。提供与保护要求有关的信息，包括基于微处理器的保护系统、应用和设置原理，以使读者能够确定电机安装所需的保护功能。 本文介绍了鼠笼式、绕线转子感应电动机和同步电动机的继电保护。本指南还总结了继电器和装置的单独使用和组合使用，因此用户可以选择必要的设备，以获得足够的电机保护。本指南主要涉及三相整体式马力电机和可调功率电机的保护- 在特别指定的位置加速行驶。 本指南并非旨在详细说明每种情况下所有电机的保护要求。它为大多数应用程序提供了足够的指导，可以为用户提供足够的信息保护。

This application guide presents generally accepted methods of protection for ac motors. It identifies and summarizes the functions necessary for adequate protection of motors based on type, size, and application. The recommendations in this guide are based on typical installations. Information relating to protection requirements, including microprocessor based protection systems, applications, and setting philosophy is provided to enable the reader to determine required protective functions for motor installations. Relay protection of squirrel-cage, wound rotor induction motors, and synchronous motors is presented herein. This guide also summarizes the uses of relays and devices, individually and in combination, so the user may select the necessary equipment, to obtain adequate motor protection. This guide is concerned primarily with the protection of three-phase integral horsepower motors and adjustable-speed drives where specifically indicated. This guide does not purport to detail the protective requirements of all motors in every situation. What it does provide is enough information and guidance for the user to implement adequate protection for most applications.