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Description / Abstract:
General Format. 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 gi de is concerned primarily with the protection of three-phase integral horsepower motors and refers to two- phase 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.
Section 2, Motor Protection Requirements, presents a brief description of the damaging effect on a motor of abnormal voltage, current, temperature, and incorrect operating conditions or procedures. A clear understanding of the electrical and mechanical response of the motor to these abnormalities will greatly assist the reader in evaluating the need for, and the means of, obtaining adequate motor protection in any specific situation.
Section 4, Settings and Adjustments of Protective Devices, presents a discussion of the various factors that must be considered in determining the setting of each relay or device. Whenever it is applicable, a discussion is given on the desireability of using a device to ac¬tuate an alarm or a trip.
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.
Section 2, Motor Protection Requirements, presents a brief description of the damaging effect on a motor of abnormal voltage, current, temperature, and incorrect operating conditions or procedures. A clear understanding of the electrical and mechanical response of the motor to these abnormalities will greatly assist the reader in evaluating the need for, and the means of, obtaining adequate motor protection in any specific situation.
Section 4, Settings and Adjustments of Protective Devices, presents a discussion of the various factors that must be considered in determining the setting of each relay or device. Whenever it is applicable, a discussion is given on the desireability of using a device to ac¬tuate an alarm or a trip.