Protective Relays

H. Todd Victor

Description

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. 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 author's 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 Westing house Electric Manufacturing Company for such excerpts; also to the American Institute of Electrical Engineers for several paragraphs quoted from its June, 1919, Proceedings.

Sujets

• Sciences et techniques
• Electronic engineering

Informations

• Publié par: Forgotten Books
• Date de parution: 27 novembre 2019
• Nombre de lectures: 0
• EAN13: 9780243663743
• Langue: English
• Poids de l'ouvrage: 16 Mo

Extrait

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Y When thefitalledwere built and in electric generator r t no provi ion made for di connecting them automatically from the ine c of trouble uch overload or hort circuit hi overlooked for rea on It not con idered detrimental to have ervice interrupted the ele ctri c y tem more or le a novelty and in the ex tage and the de ign of generator and prime mover uch that in ca e heavy overload either the prime mover would or the beltfldropthe voltage y or low that no electrical damage could be done owever the mechanical and electri cal de ign genera tor and p ime mover gradually improved it noticed that in the event a heavy overload the increa ed current would burn out the weake t pot in the y tem ometime thi in the armature ometime in the wiring and ometime in the witche aturally the re ult to in ert intentionally a weak pot at ome convenient point in the y tem by con a piece wire much aller than the main wire that when the overload occurred thi wire would burn out and then the operator knew j u t where to look for trouble when the power went hi the r t fu e In talling the wirin near infltoammable material led another trouble ri k during a heavy hort circuit the wire melted and the red hot metal thrown violently in dire ction remedy to e clo e the fu e in an in ulating non tube to prevent re and al o to provide fu e block and clip that the fu e could be replaced ea ily in ca e of overload blowing them out