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Full Description

Scope

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.

Purpose

This Guide summarizes the use of relays and devices such that the reader may select the necessary equipment to provide adequate protection for AC generators from short circuits and abnormal operating conditions. Improved protection schemes have now been proven and multifunction relays now available provide the user more choices. These concepts need to be added to the Guide to maintain its completeness.

Abstract

Revision Standard - Active. A review of the generally accepted forms of relay protection for the synchronous generator and its excitation system is presented. This guide is primarily concerned with protection against faults and abnormal operating conditions for large hydraulic, steam, and combustion turbine generators.
 

Document History

  1. IEEE C37.102-2006

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    IEEE Guide for AC Generator Protection

    • Most Recent
  2. IEEE C37.102-1995


    IEEE Guide for AC Generator Protection

    • Historical Version
  3. IEEE C37.102-1987


    IEEE Guide for AC Generator Protection

    • Historical Version