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A.I.E.E., Journal of the

Issue 7 • Date July 1924

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Displaying Results 1 - 25 of 41
  • Table of contents

    Publication Year: 1924 , Page(s): 1
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  • Current electrical articles published by other societies

    Publication Year: 1924 , Page(s): 1
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  • New type of convention proves a success

    Publication Year: 1924 , Page(s): 597 - 598
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    A convention which made Institute history was held in Worcester, Mass., early in June. This was the first convention held by a geographical district of the Institute. Much credit must be given to the officers and sections of the district, District No. 1, for their courage in undertaking such a meeting with no precedent for guidance, and they are to be complimented also on the excellent way in which the meeting was planned and conducted. A report of the meeting is given on another page of this issue. View full abstract»

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  • A new type of single-phase motor

    Publication Year: 1924 , Page(s): 599 - 603
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    This paper deals with the development of a constant speed a-c. motor for application to single-phase current. A description is given of the derivation of this new type of motor from the plain repulsion motor. The novel feature lies in the armature which consists of a combination of three elements, namely: a commutated winding, a squirrel cage of high reactance, and a commutating device consisting of shielding metal strips. It is shown that this motor in starting and acceleration possesses the characteristics of a series motor and when up to speed has the characteristics of a shunt motor. The changing over from the series to the shunt type is accomplished without the use of any automatic device, this change taking place due to the inherent qualities of the motor. An explanation is given of the high power-factor possessed by this motor and also an elementary theory of commutation, which has proved to be as good as that in a d-c. motor with commutating poles. View full abstract»

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  • The application of the saturated-core reactor and regulator

    Publication Year: 1924 , Page(s): 604 - 607
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    The purpose of this paper is to state briefly the use of voltage regulators and reactors in transmission and distribution systems and to mention operating requirements which might be best met by the use of saturated-core type regulators or reactors. The saturated-core type regulator and reactor consists of an iron core with two sets of coils. One set of coils is connected to a d-c. circuit and the other set to an a-c. circuit. The theory, design and construction of the saturated-core type regulator and reactor is discussed in A. Boyajian's paper. View full abstract»

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  • General light and power supply of Chicago

    Publication Year: 1924 , Page(s): 608 - 609
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    The development of a distribution system is largely determined by the load density and Us rate of change. The following is a discussion of these factors and their influence on the Chicago distribution system: The d-c. system which supplies the central part of the city includes an area of about one sq. mi. in which the load is expected to reach 200,000 kw. in 20 years. This would economically require substation supply of about 10 substations of 25,000 kw. each. Surrounding the small d-c. area the general light and power supply over the city is by means of 60-cycle, 4,000-volt circuits, except for the larger industrial loads which are supplied from 12,000-volt lines. The load density of the greater part of the 4,000-volt system is about 4,000 kv-a. per square mile, and the economical supply would be from 7,000 kv-a. remote controlled substations spaced about 1.3 miles. The maximum density of load on this system is 10,000 kv-a. which would require 10,000-kv-a. substations. Calculations indicate that, with increasing load densities, the economy of this intermediate distribution voltage disappears, and in the ultimate development higher distribution voltages are necessary. View full abstract»

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  • New type of high-tension network: An interconnecting system for the supply of electric power over large areas

    Publication Year: 1924 , Page(s): 610 - 618
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    The purpose of the paper is to present for consideration a new method of interconnecting sources of power and load centers in a large district with a well developed and well distributed load. The central idea is the superposition of a high tension network of single-circuit lines over the whole district for the purpose of supplying a medium in which current may flow in any general direction as changing conditions may dictate. This is similar to the underground network of the Edison Companies in the large cities. With a such a layout available, power anywhere in the district may be fed into the network and it may be taken out at any other point without serious loss of energy. The network is connected directly to load centers as well as to existing generating centers and thus greatly assists the present distribution lines distributing power and also stabilizes the potential at each load center reached. The charging current of the network may largely neutralize the lagging component of the load with favorable design. A concrete illustrative network is worked out in considerable detail, covering the present load with an equal amount of new future load in the interconnected systems of Alabama, the. Carolinas, Georgia and Tennessee, with a branch to the Appalachian Power Company in Virginia. The result shows a very effective, efficient and low cost system for this territory. The plan is applicable to other districts as well. Details are given as to the layout taken and the operating characteristics of the system. View full abstract»

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  • Notes on mine hoisting

    Publication Year: 1924 , Page(s): 618 - 621
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    ELECTRICALLY driven mine hoists have at last come into their own. For many years manufacturers labored with prospective buyers with little results. Long and laborious calculations were made, ratings determined with great accuracy, detailed specifications drawn and presented to the customer. He usually purchased a steam hoist. The good judgment of such a decision could hardly be questioned. The steam hoists had given good and dependable service for many years. The electric hoist was a new and untried device. Power lines were not as reliable as they are today. The mine shaft is the neck of the bottle and once this becomes plugged from any cause whatsoever, the output stops and the usual trouble ensues. Operators felt they had trouble enough with most shafts and would not consider a propositon, which to them seemed to have great possibilities for trouble, the remedying of which was beyond their control. View full abstract»

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  • Automatic substations for supplying 1500 volts: Direct current to Suburban railways

    Publication Year: 1924 , Page(s): 622 - 626
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    Review of the Subject — The engineer in applying automatic substations to an existing electrified traction property is often forced to make the most of a poorly designed or antiquated distribution system. By comparison, the problem of designing the distribution system for the electrification of a steam railroad is often very simple. The choice of proper converting equipment is perhaps not so easily made. The author brings attention to a number of important points which should be given careful consideration by those contemplating electrification. View full abstract»

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  • Insulation tests of transformers as influenced by time and frequency

    Publication Year: 1924 , Page(s): 627 - 633
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    Many transformers are now being designed for service with one end of the high-voltage winding solidly grounded. These transformers require an over potential test by induced voltage of either 2.73 or 8.46 times their normal line voltage above ground plus 1000 volts. These tests must be made at more than normal frequency, to avoid too high a flux density in the core, and also to reduce the power required for excitation. It has long been known that the breakdown voltage of solid materials was affected by the length of time of application of voltage. Likewise the frequency of the applied voltage is shown to affect the breakdown voltage for solid insulations, increase in the frequency resulting in a decreased breakdown voltage. The voltage required for creepage failure is shown to be relatively unaffected by frequency. From the results of the tests made it is concluded that induced voltage tests on transformers with graded insulation at higher than normal frequencies should not have the test voltage reduced, but should have the duration of the test shortened to make the severity of the test comparable to the test at 60 cycles on normally insulated transformers. View full abstract»

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  • Application of automatic substations to central: Station service in metropolitan districts

    Publication Year: 1924 , Page(s): 634 - 641
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    The present trend to interconnection and the installation of large capacity stations, with the changing character of city load, make relief of the operating crew of a system of the greatest importance. This can best be done by the use of automatically controlled substations in the various types of service. Equipment for each class of service is in successful operation showing great dependability and any particular problem of the operating companies can be attached, keeping in mind certain fundamentals of design, construction and application. View full abstract»

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  • Hydroelectric practises and equipment on the Pacific Coast

    Publication Year: 1924 , Page(s): 641 - 646
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    The paper takes up the physical features having deciding influence on design and construction of hydroelectric plants. It describes the mountain system of the region, the precipitation, the runoff, the streams suitable for power development, and the major characteristics of the development; then takes up a little more in detail the structural features, such as reservoirs and diversion dams, the conduit system, surge tanks and forebays, pressure pipes, power houses and equipment. The choice of impulse and reaction turbines is discussed and some performance curves given; this followed by conditions imposed upon modern plants by the transmission line; switch gear is briefly discussed followed by a resume on transmission lines and their control. Finally, some results which have been obtained are related, and the paper ends up with the hope that hydroelectric developments and distribution will continue as in the past, rather than have it undertaken by competing municipalities, which by ambitious advertising of cheap power (tax free) would endeavor to attract industries and people to their crowded areas. It is felt that the hydroelectric power industry on the Pacific Coast has distributed the benefits of cheap electricity to the small and large community alike, tending to more stable development of the entire region. View full abstract»

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  • Tooth pulsation in rotating machines

    Publication Year: 1924 , Page(s): 646 - 650
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    1. An experimental method is presented of checking the magnitude of flux pulsations in the teeth of rotating machines where both members are slotted. The method consists in using metallic electrodes shaped like the teeth of a machine and an electrolyte or mercury to represent the air. Voltage is applied between the two members and the current through the tooth under consideration is measured. The magnitude of this current under different conditions is proportional to the magnitude of the flux which would flow under the analogous magnetic conditions. 2. The test results are compared with the pulsation amplitudes as calculated by two methods. The test results are in general slightly lower than the calculated but the agreement is fairly good. 3. It is believed that either of the above-mentioned methods can be used to calculate tooth pulsations without serious errors where saturation effects are not appreciable. These methods should be specially useful in determining which of two or more designs would be subject to the lesser pulsation losses. 4. The effect of saturation in the iron is determined experimentally by making the ratio of the mercury to the electrode resistance small. This ratio corresponds to the magnetic permeability. The effect of the tooth resistance on the amplitude of the pulsation is calculated by assuming three resistances in series, namely, the stator and rotor tooth resistances and the air gap resistance. The calculated and test values check reasonably well. 5. It is shown that the effect of saturation on pulsation amplitude for actual machines can not be calculated by adding directly the air gap and tooth reluctances due to the fact that the permeability of iron is not constant. In order to actually calculate the effect of saturation, it is necessary either to plot portions of the magnetization curve or to make use as we do of the incremental permeability values. 6. The method described of allowing for saturation is too complicated for ordinary d- sign calculations but is useful in giving a clearer picture of just what these effects are and could be successfully used for special cases where the extra labor involved was warranted. 7. These methods do not apply when short-circuited windings are present in the slots. It is hoped at a later date to consider this aspect of the problem. 8. We believe it is possible by the use of the outlined methods below to calculate simple, reasonably reliable correction curves for saturation effects which may be used both for the case of uniform mean flux and for a sine distribution of the mean flux. View full abstract»

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  • Operating problems of the railroads: Addresses and discussion at transportation meeting held at Mid-Winter Convention of A. I. E. E., Philadelphia, Pa., afternoon of February 5, 1924

    Publication Year: 1924 , Page(s): 651 - 653
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  • Address by J.E. Crawford

    Publication Year: 1924 , Page(s): 653 - 655
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    I can tell you in words of one syllable our experience on the Norfolk and Western. Our electrification problem is rather different from the problem of most of the other lines. When we first undertook electrification we were faced with the problem of handling about nine hundred cars in each direction over very heavy grades, and in very heavy tonnage, and our first thought was to investigate electrification merely from a pusher standpoint; that is, we would bring the tonnage trains up and use an electric pusher over the grade. View full abstract»

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  • Discussion [of "Address by J.E. Crawford"]

    Publication Year: 1924 , Page(s): 655 - 659
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    The discussors (in order) are: N.W. Storer; N.D. Ballantine; J.E. Crawford; Mr. Coleman; Mr. Brenner; A.H. Babcock; W.S. Murray; and William Elmer. View full abstract»

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  • Lightning arrester experience in California: Particularly as regards the Southern California Edison company's system

    Publication Year: 1924 , Page(s): 660 - 665
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    The southern portion of the Pacific Coast is comparatively free from lightning disturbances and the number of such disturbances, as compared with the number of lightning storms in other sections of the United States, is quite small. However, the expansion of the high voltage transmission network with the installation of many additional substations and further expansion of distribution systems has made necessary the use of some form of protection against transient high voltages throughout the system of the Southern California Edison Company. View full abstract»

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  • Illumination items: The increasing importance of light in industry

    Publication Year: 1924 , Page(s): 665 - 666
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    To the man who sees in the promotion of good lighting an opportunity for service, this article is nothing short of an inspiration; to him who is satisfied to supply merely what his customer asks for, regardless of its adequacy, it sounds a warning. The following article formed the editorial feature of Electrical World for September 29th, 1923, and is printed by permission. View full abstract»

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  • Re-lighting the gas station

    Publication Year: 1924 , Page(s): 666
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    The gasoline filling and service station has come forth from the garage where it formerly led a relatively quiet and obscure existence, boldly to take its stand in the high places alike of business thoroughfare and residental street. View full abstract»

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  • Floodlighting a Church at night

    Publication Year: 1924 , Page(s): 666
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  • Annual convention at Edgewater beach, Chicago

    Publication Year: 1924 , Page(s): 667
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  • The Pasadena convention and excursion trip

    Publication Year: 1924 , Page(s): 667
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  • Northeastern district holds meeting of high character

    Publication Year: 1924 , Page(s): 667 - 668
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  • International mathematical congress

    Publication Year: 1924 , Page(s): 668
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  • Annual meeting of N.Y. Electrical society

    Publication Year: 1924 , Page(s): 668
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Aims & Scope

The Journal of the American Institute of Electrical Engineers (AIEE) contains articles published between 1924 and 1930. Contents are devoted to the advancement of theory and practice of electrical engineering and the allied arts and sciences.

This Journal ceased publication in 1930. The current retitled publication is IEEE Spectrum.

Full Aims & Scope