本《同步发电机继电保护应用指南》介绍了同步发电机及其励磁系统的公认保护形式。它总结了继电器和设备的使用，并作为选择设备以获得充分保护的指南。本指南主要涉及大型水力、蒸汽和燃烧式涡轮发电机的故障和异常运行条件保护。根据机器尺寸确定发电机保护是困难的，因为所需的保护可能更多地取决于发电机对电力系统的重要性，而不是发电机的尺寸。 提出的建议适用于典型的同步发电机安装。然而，这已经足够了 提供与保护要求、应用和设置原理相关的背景信息，使读者能够评估需求、选择并在大多数情况下应用合适的保护。 本指南中讨论的保护功能可通过基于多功能微处理器的保护系统（数字系统）实现。保护原理、实践和限制与使用分立元件继电器的实现基本相同。用于执行某些保护功能的算法可能不同，但应产生相同或更好的保护。 然而，使用数字系统，例如改进的频率响应（带宽）和阈值（拾取设置），性能和能力可能会更好。这些数字系统还可以提供其他增强功能的附加功能。 本指南并非旨在详细说明每种情况下所有发电机的保护要求。例如，备用和应急发电机被明确排除在外。

This application guide for the relay protection of synchronous generators presents a review of the generally accepted forms of protection for the synchronous generator and its excitation system. It summarizes the use of relays and devices and serves as a guide for the selection of equipment to obtain adequate protection. The guide is primarily concerned with protection against faults and abnormal operating conditions for large hydraulic, steam, and combustion turbine generators. Basing generator protection on machine size is difficult because the desired protection may be determined more by the importance of the generator to the power system than by the size of the generator. The recommendations made pertain to typical synchronous generator installations. However, sufficient background information relating to protection requirements, applications, and setting philosophy is given to enable the reader to evaluate the need, to select, and to apply suitable protection for most situations. The protective functions discussed in this guide may be implemented with a multifunction microprocessor based protection system (digital system). The protection philosophy, practices, and limits are essentially identical to those of the implementation using discrete component relays. The algorithms used to perform some of the protection functions may be different, but should produce equal or better protection. However, the performance and capability may be superior using the digital systems such as improved frequency response (bandwidth) and thresholds (pickup settings). Other additional features may be available from these digital systems that enhance the functionality. This guide does not purport to detail the protective requirements of all generators in every situation. For example, standby and emergency-use generators are specifically excluded.