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Transactions of the American Institute of Electrical Engineers

Jan. 1926

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  • Transactions of the American Institute of Electrical Engineers

    Publication Year: 1926, Page(s): nil1
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    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 1926, Page(s): nil2
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    Freely Available from IEEE
  • Preface

    Publication Year: 1926, Page(s): nil3
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    Freely Available from IEEE
  • An Investigation of Transmission-System Power Limits

    Publication Year: 1926, Page(s):1 - 21
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5841 KB)

    Results of theoretical analysis, verified by miniature-system tests of the power limits of transmission systems, are discussed, among the major conclusions being the following: The criterion for stability under all conditions is the steady-state power limit. The charging kv-a. exercises marked detrimental effects on stability. The characteristics of synchronous terminal apparatus are of great impo... View full abstract»

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  • Steady-State Stability in Transmission Systems Calculation by Means of Equivalent Circuits or Circle Diagrams

    Publication Year: 1926, Page(s):22 - 41
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3417 KB)

    The maximum load on a proposed transmission system must be within the steady-state power limit of the system for stability of operation. Two methods of calculating steady-state stability are given in detail and illustrated by examples. (1) The given transmission system is replaced by a simple equivalent system; then the steady-state power limit of this equivalent system is determined graphically. ... View full abstract»

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  • Practical Aspects of System Stability

    Publication Year: 1926, Page(s):41 - 50
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3343 KB)

    During the past few years there has been much discussion regarding the behavior of long transmission lines under transient conditions, such as flashovers, short circuits, arcs and grounds which would tend to make them unstable, but unfortunately this discussion has been largely theoretical due to the absence of any actual operating data upon which to base assumptions. It has only been recently tha... View full abstract»

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  • Studies of Transmission Stability

    Publication Year: 1926, Page(s):51 - 94
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10663 KB)

    Stability may be defined as the capacity of a power system to remain in equilibrium under steady load conditions, and its ability to regain a state of equilibrium after a disturbance has taken place. The lack of stability first manifested itself in the cases of overloaded machines and high impedance tie lines. The transmission of large blocks of power over long distances has presented the problem ... View full abstract»

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  • Transmission Systems with Over-Compounded Voltages

    Publication Year: 1926, Page(s):95 - 101
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    A usual method of calculating a transmission line with transformers, in which the voltage is held constant at both ends by synchronous condensers, is to use the circle diagram method. It is often advisable to use ``over-compounded'' voltage instead of constant voltage; that is, to increase the voltage as the load increases. Methods of calculation are given in this paper for two cases, first with o... View full abstract»

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  • Dielectric Absorption and Theories of Dielectric Behavior

    Publication Year: 1926, Page(s):102 - 124
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5876 KB)

    The first report of the Committee on Electrical Insulation of the Division of Engineering and Industrial Research of the National Research Council laid a plan for a review of existing data and information and its coordination, looking to a comprehensive plan of experimental attack. The whole field was divided into a number of divisions which have since been assigned to several groups of investigat... View full abstract»

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  • Theory of Absorption in Solid Dielectrics

    Publication Year: 1926, Page(s):124 - 140
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3768 KB)

    Most solid dielectrics are imperfect in the sense that when a constant d-c. voltage is suddenly applied, a displacement of electricity first takes place almost instantly to a certain value, and then continues to increase asymptotically towards an ultimate magnitude. Accordingly, an initial electric charge and a greater final charge may be distinguished, with the corresponding values of initial and... View full abstract»

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  • Ionization Studies in Paper-Insulated Cables---I

    Publication Year: 1926, Page(s):141 - 164
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5230 KB)

    A research investigation of the ionization phenomena which occur in paper-insulated, high-voltage power cables is being made at the Harvard Engineering School under the auspices of the Impregnated Paper-Insulated Cable Research Committee. The paper presents some of the preliminary results which have been obtained, certain tentative conclusions that are suggested by the data and a description of th... View full abstract»

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  • Operating Performance of a Petersen Earth Coil-II

    Publication Year: 1926, Page(s):165 - 168
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    At the A. I. E. E. Spring Convention, Pittsburg, April 24-26, 1923, a paper was presented by the authors on the operation of a Petersen earth coil installed by the Alabama Power Company on its Lock 12-Vida 44,000-volt system. That paper reported an excellent performance record for the coil, although several unaccounted-for bus insulator flashovers occurred at Lock 12, indicating that further inves... View full abstract»

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  • Theory of the Autovalve Arrester

    Publication Year: 1926, Page(s):169 - 177
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2001 KB)

    The advantage of valve type arresters for high-voltage, power-system protection is briefly discussed. The theory of the autovalve arrester is given. View full abstract»

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  • Current Limiting Reactors with Fire-Proof Insulation on the Conductor

    Publication Year: 1926, Page(s):178 - 183
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4718 KB)

    In a previous paper, tests were described which proved conclusively that if conducting material were lodged between the turns of a reactor having bare conductor, the reactor would flash-over at the instant a failure occurred on the circuit in which the reactor was placed. In this paper, tests are described which were made during the development of a proper insulation for the conductor of reactors.... View full abstract»

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  • Temperature Rise and Losses in Solid Structural Steel Exposed to the Magnetic Fields from A-C. Conductors

    Publication Year: 1926, Page(s):184 - 202
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5421 KB)

    Experimental investigations were made for the determination of the temperature rise and the losses occurring in structural steel members exposed to the fields from a-c. conductors. The worlz originated fromn the demand among the designing engineers of an electrical manufacturing company for practical data which would enable them to estimate, at least roughly, the temperature rise and the heat loss... View full abstract»

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  • Carrying Capacity of 60-Cycle Busses for Heavy Currents

    Publication Year: 1926, Page(s):203 - 210
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2515 KB)

    Up to the present time it has seldom been necessary to design busses for carrying capacity above 2000 or 3000 amperes. Within the last few years we have passed this mark, and we shall soon be required to design busses for very much larger capacities. For simple geometrical designs there are formulas from which we may calculate the capacities of large busses. These simple designs cannot be easily m... View full abstract»

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  • Supervisory Systems for Electric Power Apparatus

    Publication Year: 1926, Page(s):211 - 220
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6503 KB)

    A general survey and description of the various types of supervisory systems for control and indication of remotely located electrical apparatus is given in the paper, the author first of all comparino the better known remote-control system with the supervisory system in general practise today. Description is given of the selector, distributor, audible, code-visual, synchronous-relay-visual and th... View full abstract»

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  • A Contribution to Research on the Experimental Determination of the Losses in Alternators

    Publication Year: 1926, Page(s):221 - 230
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2245 KB)

    In this paper the author deals with one of the questions with which the International Electrotechnical Commission is at present occupied, namely, the determination by simple tests of the actual losses in alternators. The author first reviews the existing rules and then states the variation of the losses in alternators as a function of the load and as a function of the power factor. His paper conta... View full abstract»

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  • No-Load Copper Eddy-Current Losses

    Publication Year: 1926, Page(s):231 - 239
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1904 KB)

    One of the factors which is sometimes responsible for very considerable losses in rotating machines is that of eddy-current losses in the copper conductors resulting from slot leakage flux produced by the main flux. These losses occur at no-load as well as under load and should not be confused with the copper losses resulting from the slot leakage flux produced by the load current. These no-load c... View full abstract»

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  • Mechanical Force Between Electric Circuits

    Publication Year: 1926, Page(s):240 - 252
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2080 KB)

    A general equation is developed for the mechanical force exerted by a system of n electric circuits, upon any part of that system. The electric circuits are assumed to contain resistances, and the reluctance of the several magnetic circuits is assumed to be a function of both the currents and the relative positions of the circuits. The equation is therefore applicable to circuits involving saturat... View full abstract»

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  • Ventilation of turbo alternators-concluding study multiple path radial systems

    Publication Year: 1926, Page(s):253 - 267
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4769 KB)

    In 1924 two papers were presented before the A. I. E. E. on Turbo Alternator Ventilation. In one of the papers tests on two models for two methods of ventilation were described, and data from the tests were given. The other paper contained a mathematical treatment for one system of ventilation, which was based upon the data obtained from the tests. It was recognized that the tests were not suffici... View full abstract»

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  • Development and Application of Loading for Telephone Circuits

    Publication Year: 1926, Page(s):268 - 294
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (9444 KB)

    A review of the art of loading telephone circuits as practised in the United States. The introductory section briefly reviews the theory of coit loading, and summarizes the principal characteristics of the first commercial standard loading coils and loading systems, thereby serving as a background for the description of the various improvements of outstanding importance which have been made in the... View full abstract»

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  • Cipher Printing Telegraph Systems For Secret Wire and Radio Telegraphic Communications

    Publication Year: 1926, Page(s):295 - 301
    Cited by:  Papers (76)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3953 KB)

    This paper describes a printing telegraph cipher system devetoped during the World War for the use of the Signal Corps, U. S. Army. This system is so designed that the messages are in secret form from the time they leave the sender until they are deciphered automatically at the office of the addressee. If copied while en route, the messages cannot be deciphered by an enemy, even though he has full... View full abstract»

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  • Refraction of Short Radio Waves in the Upper Atmosphere

    Publication Year: 1926, Page(s):302 - 333
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5899 KB)

    The paper shows that the striking phenomena of short-wave radio transmission (i. e., below 60 meters) can be quantitatively accounted for on a simnple electron refraction theory in which the effect of the earth's magnetic field and electron collisions may be neglected as a first approximation. The distribution and number of electrons per unit volume in the upper atmosphere required on this theory ... View full abstract»

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  • Methods of High Quality Recording and Reproducing of Music and Speech based on Telephone Research

    Publication Year: 1926, Page(s):334 - 348
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6699 KB)

    The paper deals with an analysis of the general requirements of recording and reproducing sound, with the nature of the inherent limitations where mechanical records are used, ana a detailed description of a solution involving, frst, the use of electrical equipment for the purposes of recording and, second, the use of mechanical equipment based on electric transmission methods for reproducing. Pro... View full abstract»

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