Journal of the American Institute of Electrical Engineers

Issue 12 • Dec. 1923

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Displaying Results 1 - 25 of 63
  • Performance of auto transformers with tertiaries under short-circuit conditions

    Publication Year: 1923, Page(s):1243 - 1247
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1960 KB)

    The problem of operating many of the present day transformers designed and built to function in sizes and under conditions unheard of only a few years ago, is now of prime importance to many of the larger power companies. A statement of one type of the operating troubles encountered in the larger sizes is discussed in this paper and data taken as far as practicable under operating conditions is gi... View full abstract»

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  • Economic considerations of the power factor control of long high-voltage lines

    Publication Year: 1923, Page(s):1248 - 1250
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (622 KB)

    In the early days of the electric industry when transmission lines were short, power factor control was not considered necessary. At the present time, with transmission lines of 200 miles and more, and with loads whose power factor is very poor owing to the universal use of the induction motor, power factor control is being forced upon the transmission engineer as a necessity if power is to be tra... View full abstract»

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  • High-voltage switches, bushings, lightning arresters: Experiences of the Southern California Edison Company on its 60,000, 150,000 and 220,000-volt system

    Publication Year: 1923, Page(s):1251 - 1254
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3137 KB)

    This paper describes the experiences of the Southern California Edison Company with oil switches on its 60-kv., 150-kv. and 220-kv. systems, with air break switches on its 220-kv. system, with bushings on its 60-kv., 150-kv. and 220-kv. systems, and with lightning arresters on all voltages from 11 kv. up. In some instances the experiences do not lead to unquestionable conclusions. This is particul... View full abstract»

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  • Methods of voltage control of long high-voltage lines by the use of synchronous condenser

    Publication Year: 1923, Page(s):1255 - 1256
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (500 KB)

    The following points are covered in this paper: Inherent characteristics of high-voltage lines and high-voltage transformers. Effect of low power factor load on high-voltage lines as to limiting capacity and uses of condenser for increasing line output and obtaining good voltage control. Characteristics which must be met by generators, condensers and regulating equipment in order to control proper... View full abstract»

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  • Test results on the performance of suspension insulators in service

    Publication Year: 1923, Page(s):1257 - 1258
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    Megger test results on suspension insulators on the lines of the Great Western Power Company covering records since 1908 giving the percentage of depreciation by districts, viz., mountain, valley and coast conditions; also results covering the different types. View full abstract»

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  • Transformers for high-voltage systems

    Publication Year: 1923, Page(s):1259 - 1260
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (499 KB)

    The designs of transformers for 220-kv. systems do not represent radical departures from designs which have become standard for lower voltages. The solidly grounded neutral system is used and advantage is taken of this to use graded insulation and reduced voltage test. Auto-transformers are used to connect between the 220-kv. system and existing high voltages and are connected star-star with delta... View full abstract»

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  • Waterwheel construction and governing

    Publication Year: 1923, Page(s):1261 - 1263
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (787 KB)

    THE design and manufacture of hydraulic turbine equipment has been very considerably accelerated within the past few years; more particularly since the World War, as the lessons it taught us in regard to diminishing fuel sources and the interruption to fuel supply through labor disturbances, both directly in fuel production and indirectly in its transportation, have stimulated in a very decided ma... View full abstract»

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  • Applications of long distance telephony on the Pacific Coast

    Publication Year: 1923, Page(s):1264 - 1270
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (4004 KB)

    This paper deals with the general problem of providing long distance telephone service on the Pacific Coast. A description of the present toll plant is given and the applications which have been made of recent developments in telephone practise are illustrated. Reference is made to the extensive use which has been made of carrier telephone and telegraph systems, and the many special problems, such... View full abstract»

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  • Recent developments in carrier-current communication

    Publication Year: 1923, Page(s):1271 - 1274
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3317 KB)

    Carrier-current communication over transmission lines has been developed to a point where its practicability and value are thoroughly established. This paper discusses several recent developments in apparatus and methods of operation. Carrier-frequency energy flow along the line is discussed briefly to give a mental picture of the electromagnetic and electrostatic conditions existing. Standard 50 ... View full abstract»

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  • Some experiences with a 202-mile carrier-current telephone

    Publication Year: 1923, Page(s):1275 - 1277
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (773 KB)

    ON April 11th, 1923, the Pacific Gas and Electric Company placed in operation a carrier-current telephone system between Pit River Power House No. 1 and Vaca-Dixon substation. This system utilizes the twin-circuit 220,000-volt transmission lines between the two points for a conducting medium and is for use primarily by the operating department in directing the operation of the power houses in the ... View full abstract»

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  • The cooling of electric machines

    Publication Year: 1923, Page(s):1278 - 1288
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    THE disposal of the heat resulting from the electrical and mechanical losses in any electric machine is always an important item to the designer as well as to the operator of the machine. These losses appearing all in the form of heat must be transferred from their source with a temperature gradient not to exceed the maximum safe operating temperatures. These maximum temperatures are limited by th... View full abstract»

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  • Free and forced convection of heat in gases and liquids

    Publication Year: 1923, Page(s):1288 - 1293
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1439 KB)

    THE general problem of heat transfer requires a knowledge of the laws of conduction, radiation and convection. In 1822, Fourier gave us the first thoroughly scientific definition of conductivity and reduced the problem of heat conduction to an exact science, with a power and completeness which left little room for extension or improvement even to the present day. The law of radiation was first sug... View full abstract»

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  • Artificial transmission lines with distributed constants

    Publication Year: 1923, Page(s):1293 - 1296
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    THE theory of the transmission of electricity has been materially advanced through the use of artificial transmission lines in the laboratory. View full abstract»

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  • The influence of gaseous ionization and spark discharge on fibrous insulating materials and on Mica

    Publication Year: 1923, Page(s):1297 - 1304
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1963 KB)

    It has been suspected for a long time that gaseous ionization in air layers and pockets inside of composite insulation results in deterioration and shortening of the life of the insulation. Experiments described in the paper show that within a very short time fibrous insulation exposed to such ionization rapidly loses its mechanical and electrical properties. Mica is shown to be practically immune... View full abstract»

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  • Oscillographic study of the current and voltage in a permeameter circuit

    Publication Year: 1923, Page(s):1305 - 1308
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (854 KB)

    The purpose of the investigation was to study the form of the voltage-time and current-time curves, existing in a permeameter circuit, and to reduce the time required for the reversal of the magnetizing current. The permeameters used in the investigation were of the U-shaped yoke type. Oscillograms were taken of the current and of the induced voltage during the opening and also during the reversal... View full abstract»

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  • The economic development of a step-by-step automatic telephone equipment

    Publication Year: 1923, Page(s):1309 - 1317
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (7570 KB)

    Since Campbell published his paper in 1910, modifications have been made on the step-by-step telephone equipment. This paper covers a review of the economic development of this system with particular emphasis on the technical development in general. The material is grouped under development of circuits and trunking, mechanical design, manufacturing methods, maintenance improvements and possible fu... View full abstract»

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  • Brush mounting as a factor of satisfactory operation

    Publication Year: 1923, Page(s):1318 - 1321
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (790 KB)

    That the brush is an ever present source of trouble on rotating electrical machinery is evidenced by the back numbers of our technical periodicals which are replete with innumerable articles on the subject. These articles cover practically all problems of material and application excepting that of the geometrical design. It is this phase of the subject that the following paper attempts to give. Un... View full abstract»

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  • Modification of polyphase induction motor performance by introduction of E. M. F. in secondary

    Publication Year: 1923, Page(s):1321 - 1324
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (856 KB)

    The possibility of obtaining speed adjustment and power factor correction of induction motors by impressing an e. m. f. on the rotor is a subject which has attracted considerable attention in recent years. As compared with the straight polyphase induction motor, the graphical treatment in this case becomes much more involved, if reasonable account is to be taken of all the phenomena. The analytica... View full abstract»

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  • Shaft currents in electric machines

    Publication Year: 1923, Page(s):1325 - 1334
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (4031 KB)

    This paper describes the causes of, and remedies for, the existence of “shaft currents” or “bearing currents” which sometimes flow across the rubbing surfaces of the bearings of electric machinery, thereby gradually damaging the shaft and bearings. Up to the present time the only cause of shaft currents that has attracted any particular attention has been the use of sec... View full abstract»

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  • Discussion at Spring convention: Lightning disturbances on distribution circuits: Operating experience with current-limiting reactors: Short-circuit forces on reactor supports: Standardized insulator tests

    Publication Year: 1923, Page(s):1334 - 1338
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1263 KB)

    E. C. Stone: As I understand this lightning situation, the lightning arrester must have large charging capacities. The lightning arrester must choke the dynamic current that may follow from the system. Those two conditions are almost diametrically opposite. However, in very low voltages, by which I mean under four or five thousand the dynamic problem is comparatively simple, and you can hold down ... View full abstract»

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  • Discussion at annual convention: Electrical loud speakers

    Publication Year: 1923, Page(s):1338 - 1341
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1136 KB)

    E. W. Kellog: Mr. Nyman has mentioned a series of tests of loud speakers which I think may well be classified into what we might call the engineering tests and the listening tests. View full abstract»

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  • Transatlantic radio telephony

    Publication Year: 1923, Page(s): 1341
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (297 KB)

    W. V. Lovell: There are just one or two comments I would like to make on the paper on Transatlantic Radio Telephony, which bring out the need for the development of nomenclature keeping pace with the development of new methods. If we do not keep pace, we are going to have quite a bit of confusion. I don't think that the enterprising people who go ahead and do things ought to hold back until they c... View full abstract»

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  • Frequency measurements in electrical communication

    Publication Year: 1923, Page(s): 1341
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (297 KB)

    J. W. Horton: A comment in connection with the frequency measuring work of the Bureau of Standards may be of interest. From time to time they have transmitted standard frequencies from the radio station at the Bureau. On several occasions these have been compared with our standard as follows: The transmitted wave was received in the usual manner, amplified in a radio frequency amplifier and impres... View full abstract»

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  • Discussion on transmission line transients

    Publication Year: 1923, Page(s):1341 - 1343
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    A. Boyajian: I believe one of the puzzling discrepancies, viz., the nature of the wave front, mentioned in this paper is capable of a comparatively simple physical explanation. View full abstract»

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  • Artificial transmission lines with distributed constants

    Publication Year: 1923, Page(s):1343 - 1347
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1410 KB)

    J. F. Peters: I would like to comment on the paper by Professor Dellenbaugh. The performance of a simple transmission line at normal frequency, where the supply is at one end and the load at the other, can be calculated very accurately and with a small amount of labor. When the load or supply is distributed at several points, or there are a number of branches, the matter becomes considerably more ... View full abstract»

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Aims & Scope

This Magazine ceased publication in 1923. The current retitled publication is IEEE Spectrum.

Full Aims & Scope