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American Institute of Electrical Engineers, Transactions of the

Volume XXXIV: 1915

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Displaying Results 1 - 25 of 50
  • Synoptical and Topical Index of A.I.E.E. Transactions

    Publication Year: 1915 , Page(s): 1 - 97
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    Freely Available from IEEE
  • Index

    Publication Year: 1915 , Page(s): v - ix
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    Freely Available from IEEE
  • Report of the Board of Directors for Fiscal Year Ending April 30, 1915

    Publication Year: 1915 , Page(s): 2807 - 2824
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    Freely Available from IEEE
  • The Principles and Systems of Electric Motor Control

    Publication Year: 1915 , Page(s): 2781 - 2806
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    There is hardly anything which stands out so prominently to-day in our industrial activities, as the efficiency obtained by the electric driving of machinery. The duty or performance cycle of the motor naturally depends on the controlling apparatus, and the writer, after describing several types of resistance, endeavors to explain the various forms of magnetic control in vogue to-day for both d-c.... View full abstract»

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  • Experimental Data Concerning the Safe Operating Temperature for Mica Armature-Coil Insulation

    Publication Year: 1915 , Page(s): 2747 - 2780
    Cited by:  Papers (1)
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    The paper gives the results of three series of tests, made on the first 3750-kv-a. generator installed at Niagara Falls, to determine internal copper temperatures. The object of the tests was to obtain data to assist in the determination of the safe maximum temperature of built-up mica-and-cambric (or mica-and-paper) insulation. The present Institute Standardization Rules recommend the conservativ... View full abstract»

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  • Decomposing Magnetic Fields into their Higher Harmonics

    Publication Year: 1915 , Page(s): 2721 - 2745
    Cited by:  Papers (1)
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    When it is necessary to decompose a magnetic field into its higher harmonics the same methods used for analyzing current and voltage waves may be employed. In many cases, however, the usual long mathematical operations can be avoided by representing the field shapes as geometrical figures, such as triangles, rectangles, trapezoids, etc., all of which waves may be considered as composed of a number... View full abstract»

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  • The Unsymmetrical Hysteresis Loop

    Publication Year: 1915 , Page(s): 2693 - 2720
    Cited by:  Papers (13)
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    The paper gives results and analyses of tests to determine losses in hysteresis loops wherein the magnetism is carried through cycles in which limiting values of flux are different in amount or the mean values of flux differ from zero. Such variations of magnetism occur in inductor generators, in teeth of induction machines and in materials magnetized from rectifier circuits, etc. The author finds... View full abstract»

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  • The Effect of Displaced Magnetic Pulsations on the Hysteresis Loss of Sheet Steel

    Publication Year: 1915 , Page(s): 2671 - 2692
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1926 KB)  

    Most modern revolving electrical apparatus has teeth on the rotor or stator, or both, which are subjected to constantly varying reluctance. This variation of reluctance causes high-frequency changes of flux superimposed on the working flux. The result is a series of displaced hysteresis loops. This investigation was undertaken to determine the magnitude and, if possible, some of the laws governing... View full abstract»

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  • The Magnetic Properties of Some Iron Alloys Melted in Vacuo

    Publication Year: 1915 , Page(s): 2601 - 2670
    Cited by:  Papers (7)
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    In a paper presented before the Urbana Section, April 16, 1914, the author described results obtained from tests made on pure iron melted in vacuo, to obtain data as to its magnetic and allied properties. The present paper describes further experiments on various alloys of the electrolytic iron melted in vacuo with other elements. The author deals briefly with the iron-boron and iron-carbon alloys... View full abstract»

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  • Recent Results Obtained from the Preservative Treatment of Telephone Poles

    Publication Year: 1915 , Page(s): 2549 - 2600
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    The results of an experience with treated poles over a period of 18 years have been analyzed. Data are given for poles treated by pressure, open tank, and brush methods. The relation of these methods of treatment to the conditions which have determined the choice of pole timbers in the United States is outlined. The experience with brush treatments has reached a more advanced stage than that with ... View full abstract»

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  • Municipal Cooperation in Public Utility Management

    Publication Year: 1915 , Page(s): 2533 - 2548
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    Conditions surrounding early grants. Meager knowledge of the importance of public utilities in their inception. The changing view-point of the public with respect to the utilities. The constantly increasing investment necessary to meet public demands and the need of favorable franchise conditions, that capital may be attracted to meet same. The early franchises proved unsatisfactory. Public utilit... View full abstract»

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  • The Calculation of the Long-Distance Transmission Line under Constant Alternating Voltage

    Publication Year: 1915 , Page(s): 2511 - 2532
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    By separating real quantities and imaginaries in the general solution of the differential equations which express the relations which exist between the current and voltage at any point of a transmission line, the components of current, I1, and I2, and the components of voltage, V1 and V2, are expressed as rational functions of the four quantities cosh?? xcos ??x, sinh?? xsin ??x, sinh?? xcos ??x, ... View full abstract»

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  • Single-Phase Squirrel-Cage Motor

    Publication Year: 1915 , Page(s): 2483 - 2509
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    This paper describes a new single-phase motor which develops a large starting torque and operates with unity power factor. It outlines the manner in which the machine was developed, discusses the theory of its operation as well as the novel points to be considered in its design, and finally gives a number of test results obtained from motors of different sizes. The machine is of the squirrel cage ... View full abstract»

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  • The Repulsion-Start Induction Motor

    Publication Year: 1915 , Page(s): 2443 - 2482
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    The repulsion-start induction motor for single-phase current has come into considerable prominence during the last 10 or 15 years, as is fully attested by the large number of motors of this type now in operation, and by the increasing demand and production. While there is considerable literature available on the subject of repulsion motors, both compensated and non-compensated, and on induction mo... View full abstract»

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  • Construction Elements of the Tallulah Falls Development

    Publication Year: 1915 , Page(s): 2389 - 2442
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (9812 KB)  

    The paper gives a very complete description of the Tallulah Falls hydroelectric development, which is of interest as being one of the highest head water power plants in the world. It was designed to supply electric power to the greater part of the State of Georgia. The paper includes complete unit costs of the various items of construction. View full abstract»

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  • Supplemental Power for Hydroelectric Systems

    Publication Year: 1915 , Page(s): 2369 - 2388
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1920 KB)  

    The first part of the paper outlines the functions of the steam plant furnishing relay and supplemental power for the system whose normal source of power is water, and illustrates graphically and otherwise the relative importance of the various functions and characteristics of the supplemental plant. It further illustrates by diagrams in a hypothetical case the division of load between the hydraul... View full abstract»

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  • The Combined Operation of Steam and Hydraulic Power in the Pennsylvania Water and Power Company System

    Publication Year: 1915 , Page(s): 2361 - 2368
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    The paper relates the experience of a large hydroelectric development on an erratic river, in endeavoring to accomplish most effective combined steam and hydroelectric operation, indicating that a river may be developed to an extent many times its low water flow where there is extended cooperation between customer and power company in determining, by experimenting, the economy of further supply of... View full abstract»

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  • Rates and Rate Making

    Publication Year: 1915 , Page(s): 2279 - 2360
    Cited by:  Papers (9)
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    The necessity of recognizing load factor in rate schedules is emphasized. To obtain load factor necessitates the measurement of maximum demand; a new maximum demand meter is described which depends upon heat and heat storage. The theory of such meters is discussed. A new method of measuring power factor and volt-amperes is disclosed and a method of recognizing power factor in the rate for electric... View full abstract»

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  • Calculation of Sudden Short-Circuit Phenomena of Alternators

    Publication Year: 1915 , Page(s): 2237 - 2278
    Cited by:  Papers (3)
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    The theory and explanation of the electromagnetic phenomena involved in the sudden sbort circuit of alternators, as given by Berg and Boucherot, is first briefly considered. It is shown how complex the different resistances and reactances are that enter the equations of sudden short circuits. New methods are developed for the experimental determination of these quantities by simply determining the... View full abstract»

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  • Abnormal Voltages in Transformers

    Publication Year: 1915 , Page(s): 2197 - 2236
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3251 KB)  

    This paper deals with the electrical behavior of transformer windings when subjected to steep wave fronts and high-frequency wave trains. The dependence of the internal voltages produced, upon the distribution of capacity with the inductance of the winding, is discussed. Practical windings are divided into two general classes, one in which inductance and capacity are practically uniformly distribu... View full abstract»

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  • Phenomena Accompanying Transmission with Some Types of Star Transformer Connections

    Publication Year: 1915 , Page(s): 2183 - 2195
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1295 KB)  

    The purpose of this paper is to point out and explain some even harmonic phenomena which may attend the operation of star-star connected banks of transformers having grounded neutral on the line side only. Contrary to current opinions, the author believes the abnormal voltages and destructive effects, which often accompany star-star operation, are, in at least a large number of cases, due to even ... View full abstract»

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  • Harmonics in Transformer Magnetizing Currents

    Publication Year: 1915 , Page(s): 2157 - 2182
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2358 KB)  

    The purpose of this paper is to show in a concise manner the cause and effects of higher harmonic currents in magnetizing currents of transformers. A hypothetical case is analyzed to show the cause of the harmonics; then the schemes of connecting transformers that are commonly used for polyphase transformation are taken up and the effects of the harmonics on each case pointed out. The author also ... View full abstract»

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  • Delta-Cross Connections of Transformers

    Publication Year: 1915 , Page(s): 2141 - 2155
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    Two methods of transformer connections, the tee-cross and the delta-cross, are described, with their application for parallel operation of two-phase and three-phase systems. An attempt is made to explain as clearly as possible the voltage, current and phase relations, and the dephasing action which takes place in each case. The delta-cross system of connections lends itself to a great number of ap... View full abstract»

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  • Overhead Electrolysis and Porcelain Strain Insulators

    Publication Year: 1915 , Page(s): 2127 - 2140
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    There is a slight leakage of current from trolley wires to earth through insulated supports on all electrical overhead construction, which if not checked permits a flow of current which gives rise to electrical separation of water into oxygen and hydrogen. The oxygen liberated acts vigorously upon the adjacent metal parts, which in time become badly corroded. This electrolytic action also seems to... View full abstract»

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  • Discussion on ``Report by the Joint Committee on Inductive interference,'' San Francisco, Cal., Sept. 17, 1915

    Publication Year: 1915 , Page(s): 2113 - 2125
    Cited by:  Papers (1)
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