By Topic

Transactions of the American Institute of Electrical Engineers

Volume XXXIII: 1914

Filter Results

Displaying Results 1 - 25 of 54
  • Index

    Publication Year: 1914, Page(s):ix - xiv
    Request permission for commercial reuse | PDF file iconPDF (476 KB)
    Freely Available from IEEE
  • Sphere Gap Discharge Voltages at High Frequencies

    Publication Year: 1914, Page(s):973 - 1012
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5301 KB)

    The paper describes a series of experiments made by the authors to determine the values of steady high-frequency, high-voltage currelnts required to discharge between seven-inch copper spheres in air, at ordinary temperatures and barometric pressures. A 15-kw. arc generator was used as the source of high-frequency sustained high voltage, and the apparatus employed in securing and measuring current... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Electric Strength of Air-V

    Publication Year: 1914, Page(s):951 - 972
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2112 KB)

    The paper presents the account of an investigation of the influence of frequency on the corona, between 60 and 3000 cycles per second. The wire and coaxial cylinder method was used. A simple method for measuring the maximum value of an alternating voltage wave has been developed and used for obtaining this maximum value at the critical corona voltage. The gold-leaf electroscope was used to detect ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Sphere Gap as a Means of Measuring High Voltage

    Publication Year: 1914, Page(s):923 - 949
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1812 KB)

    A gap method of measuring high voltage is desirable in certain tests because a gap measures the maximum point of the voltage wave. The needle gap is unreliable, and is subject to large corrections due to humidity, etc. The sphere gap is free from complicated corrections and the curve is subject to calculation. Wherever voltage is measured by a gap, correction must be made for air density??that is,... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Concatenated Induction Motors for Rolling Mill Drive

    Publication Year: 1914, Page(s):899 - 921
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2556 KB)

    The paper describes a six-speed concatenated induction motor set for driving the finishing rolls of a 12-stand continuous mill. Analysis of the conditions in this mill showed that the use of a low-pressure turbine would lead to the waste of a large amount of exhaust steam and that the alternating-current turbine plant which was in operation had ample reserve capacity for driving the mill. The larg... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Methods of Keeping Down Peaks on Power Purchased on a Peak Basis

    Publication Year: 1914, Page(s):887 - 898
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2263 KB)

    The author mentions two general ways of reducing peaks, the first being to furnish the peak power from a separate source such as a local steam turbine, and the second to store some of the power furnished by the power company, which is given up later when the peak demand comes on. In the case of the plant described by the author a mixed pressure turbine was installed to take the peaks, this being s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Direct-Current Motors for Coal and Ore Bridges

    Publication Year: 1914, Page(s):873 - 886
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1862 KB)

    This paper gives a brief description of the mechanical arrangement of a coal bridge. The bridge consists essentially of a trolley car with hoisting mechanism for a self-filling bucket. A series-wound motor is recommended for driving the trolley car; and the proper method of gearing the motor for the most economical results is discussed. A series-wound motor is recommended for a low-speed hoist and... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Electrically Driven Gyroscope in Marine Work

    Publication Year: 1914, Page(s):857 - 872
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3717 KB)

    The gyroscope when continuously driven by electric power may be used for various purposes, many of its applications having especial value in marine work. Small gyroscopes are used to establish base lines for the measurement or control of angular motion. The gyro-compass makes use of the earth's daily rotation and consequent changing direction of gravity to secure a directive force a hundredfold gr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electric Heating as Applied to Marine Service

    Publication Year: 1914, Page(s):839 - 855
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1611 KB)

    Electricity is being adopted to a great extent for space heating in marine work because of the simplicity and low cost of installation, saving in weight, freedom from leaks, noises and disagreeable odors as compared to steam heat, availability for heating of individual rooms, ability of placing heaters where most efficient, portability so that storerooms and other seldom-used spaces may be readily... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Evolution of the Institute and of its Members

    Publication Year: 1914, Page(s):819 - 838
    Request permission for commercial reuse | PDF file iconPDF (2205 KB)
    Freely Available from IEEE
  • Delta and Y Connections for Railway Transmission and Distribution

    Publication Year: 1914, Page(s):807 - 817
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1191 KB)

    Transformer connections under the following three conditions are discussed: The railway (1) purchases power; (2) builds and operates the generating and transmission systems; (3) purchases power and in addition builds and operates a secondary transmission system. The choice between delta and Y connection is frequently determined by purely economic considerations. However, it is common practise to u... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Relative Merits of Y and Delta Connection for Alternators

    Publication Year: 1914, Page(s):803 - 806
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The main advantages obtained with the Y connection are as follows: (1) It is possible to bring out a lead from the neutral point of the winding, which is useful for various purposes. (2) The cost is less than with the delta connection, requiring approximately 58 per cent of the turns. (3) It is not possible for circulating currents of triple frequency to flow in the windings. The delta connection ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experience of the Pacific Gas and Electric Co. with the Grounded Neutral

    Publication Year: 1914, Page(s):767 - 802
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5140 KB)

    The paper gives an outline of the distributing system of the Pacific Gas and Electric Company of California which operates at 60 kv., the transformers being Y-connected, with the neutrals solidly grounded. The company considers the grounded neutral system has a number of important advantages with regard to the transformers, the transmission lines, and operation. The fewer turns of larger capacity ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Study of Some Three-Phase Systems

    Publication Year: 1914, Page(s):753 - 766
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1417 KB)

    The star-star, delta-delta, delta-star and star-delta connections are taken up in order and their individual peculiarities and characteristics, precautions that must be taken in operation to avoid trouble, and where and when the system may be grounded with best results, are discussed. The question of delta-delta vs. delta-star is considered: (1) For moderate voltages the delta-delta system has the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Influence of Transformer Connections on Operation

    Publication Year: 1914, Page(s):735 - 752
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1607 KB)

    In this paper the relative advantages and disadvantages in operation of the more important three-phase transformer connections are discussed. Three conditions of operation are given: First, normal; second, operation of a bank with one phase disabled; third, effect of line grounds on operation. The paper is not complete, particularly in that high-frequency or switching phenomena are not discussed. ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Harmonic Voltages and Currents in Y- and Delta-Connected Transformers

    Publication Year: 1914, Page(s):723 - 733
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1214 KB)

    The paper reviews the conditions under which triple harmonic voltages and currents are produced in Y- and delta-connected transformers. These voltages are produced by hysteresis in the core. In a single-phase transformer, increase of series resistance tends to suppress the current harmonic and produce the voltage harmonic. In three-phase transformers, a Y connection suppresses the current harmonic... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inherent Voltage Relations in Y and Delta Connections

    Publication Year: 1914, Page(s):711 - 721
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1420 KB)

    The paper gives the results of experiments made with a miniature simple transmission system to demonstrate the inherent voltage relations with different combinations of Y and delta connections. The experimental system consisted of a 7.5-kv-a. revolving field generator, with coil terminals which could be connected either Y or delta, and two banks of transformers each composed of three shell-type 3-... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experiences with Line Transformers

    Publication Year: 1914, Page(s):685 - 710
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2902 KB)

    This paper presents an analysis of the transformer troubles for one year on a system having nearly 15,000 transformers installed. This analysis indicates that about 50 per cent of the troubles traceable to the transformer can be eliminated, with no great expense, by some slight changes in the construction details and some improvements in operating methods. Reference is made to the Standard Specifi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of Electrolysis on the Compressive Strength of Cement and Concrete

    Publication Year: 1914, Page(s):673 - 684
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1189 KB)

    A paper on ``The Electrolytic Corrosion of Reinforced Concrete'', by C.E. Magnusson and G. H. Smith, was read before the A. I. E. E. June 30, 1911, and, as stated in that paper, the results could not be pronounced entirely conclusive, as the duration of the experiments was only 30 days. In the present paper a similar series of experiments is described by the authors in which the tests were continu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Future of Electric Heating and Cooking in Marine Service

    Publication Year: 1914, Page(s):659 - 672
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Indications of the future point to electric motor-driven propulsion and abandonment of coalburning boilers. Electric cooking and heating is in line with this development and the source of heat for cooking and heating will be confined to the boiler room. The future of electric cooking apparatus is assured by the progress already made in the U. S. Navy in adopting electric equipment. Detailed report... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electricity the Future Power for Steering Vessels

    Publication Year: 1914, Page(s):619 - 657
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5414 KB)

    Electrical development in the marine field has been confined in a large measure to the navy, and the best experience with electric steering gears has been obtained from navy installations. Up to the present time steam has been the universal power for operating steering gears, but certain disadvantages are in-herent in this system which can be overcome by the electric drive, and additional advantag... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Theory of the Corona

    Publication Year: 1914, Page(s):589 - 617
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2676 KB)

    The theory of the corona developed in this paper explains the coronal discharge by the application of the known laws of the discharge of electricity through gases. The experiments of Dr. Whitehead and Mr. F. W. Peek and others have shown that the surface gradient Xs at the surface of a smooth wire necessary to start the corona increases very greatly as the radius of the wire decreases. As an illus... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Milliampere Current Transformer

    Publication Year: 1914, Page(s):571 - 588
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4558 KB)

    (1) It is pointed out that by the use of a current transformer having a primary to secondary current ratio of the order of 1 to 100, oscillograms can be obtained of the charging current of a single high-tension insulator or of a few feet of high-tension transmission line; that is, oscillograms of currents of the order of 0.1 to 0.5 milliampere may be obtained. (2) The drawings and specification ar... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some Simple Examples of Transmission Line Surges

    Publication Year: 1914, Page(s):545 - 569
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2447 KB)

    The paper treats of the true wave phenomena which take place on a transmission line when switches are opened and closed or when a circuit breaker operates. These phenomena are practically the same in alternating- and direct-current systems for transmission lines up to say 150 or 200 mi. (240 or 320 km.) in length, and therefore the surges which are described in the paper are the surges which take ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some Investigations on Lightning Protection for Buildings

    Publication Year: 1914, Page(s):519 - 544
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3242 KB)

    A description is given of investigations conducted for a large manufacturer of explosives to determine upon a suitable system of lightning protection for buildings containing explosives. The work is divided into the following sections: (1) An analysis by oscillograph of the secondary currents induced by actual lightning discharges in vertical earthed conductors, the results seeming to indicate tha... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.