Protective Relays Their Theory, Design, and Practical Operation (Classic Reprint)

In preparing a work of this nature, it will be realized that the subject is so broad and varied in its scope as to preclude an authors intimate personal knowledge of each and every system described. Attempt has been made to cover the subject from the first principles of Protective Relays to the protection of high tension net-works, the object being to make the work of value not only to the operator and tester who has a fair knowledge of electricity and is seeking more information, but also to the designer of the system who may find many points not previously taken into consideration in his calculations. Consequently, many reliable sources of information were freely consulted and in several instances, passages were quoted verbatim from a booklet entitled Performance of Instrument Transformers and from Protective Relays which in turn was reprinted from an article by Mr. L. N. Crichton in The Electric Journal. Full credit is hereby given to the Westinghouse Electric Manufacturing Company for such excerpts; also to the American Institute of Electrical Engineers for several paragraphs quoted from its June, 1919, Proceedings. Some of this material has been published in the form of articles by the author in Power, Power Plant Engineering, Electrical Record and Southern Engineer, and thanks are hereby given to their editors for permission to use the text and electro-types for illustrations. The author also wishes to extend his thanks and appreciation to Mr. F. A. A nnett, Associate Editor of Powery for personal interest and assistance in the preparation of the work; to Mr. L. N. Crichton, Relay Engineer of the Westinghouse Electric Manufacturing Company, and writer of several articles from which much valuable information was obtained, who kindly read this manuscript, and offered many helpful suggestions and constructive criticisms; and to officials of the Westinghou
(Typographical errors above are due to OCR software and don't occur in the book.)