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

Issue 12 • Date Dec. 1929

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Displaying Results 1 - 25 of 43
  • Table of contents

    Page(s): 1
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  • Some activities and services open to members

    Page(s): 1
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  • A message from the President

    Page(s): 1
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  • Some leaders of the A. I. E. E.

    Page(s): 864
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  • A recording torque indicator: That records the torsional effort of motors during acceleration

    Page(s): 865 - 868
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    The measurement of torque under unstable conditions of speed is usually extremely difficult and inaccurate when a dynamometer, prony brake, or similar torque measuring equipment is used. The device described in this paper was developed primarily to obtain torque measurements under unstable conditions as well as under stable conditions, and to obtain a permanent record of these measurements. It has been particularly successful in recording speed-torque curves of motors during acceleration and it can also be applied very effectively to other fields. View full abstract»

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  • Automatic regulation of synchronous condensers: Equipped with superspeed excitation

    Page(s): 868 - 871
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    This paper describes extensive field tests made on the super-high-speed excitation equipment used with the 30,000-kv-a. synchronous condensers at the Plymouth Meeting Substation of the Philadelphia Electric Company. Oscillograms and calculated curves showing the performance of the synchronous condensers with this equipment are included, together with a discussion of the results obtained. View full abstract»

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  • Series synchronous condensers for generation of voltage consumed by line inductance

    Page(s): 872 - 875
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    The factors determining the power-carrying capacity of a transmission system are briefly discussed in this paper. The principal effects obtained by the operation of synchronous condensers used to compensate for the system consumption of lagging reactive kv-a. are pointed out. This method of compensation is contrasted with the direct method of supplying the reactive kv-a. to the line in the manner in which it is consumed, i. e., by the series method. A plan for obtaining direct or series reactive kv-a. compensation by a method employing electric machinery is described. This includes a description of a method for producing the required voltage and inserting it into the system. Some of the characteristics of operation and advantages to be gained by the use of the described method are given. View full abstract»

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  • The future of higher steam pressures in steam electric generating stations

    Page(s): 875 - 877
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    Construction and operating experience has shown that a large part of the theoretically possible gains in efficiency due to higher steam pressures has been obtained in practise. What are the future possibilities of higher pressures? The biggest problem before station designers today is to reduce the cost of construction per unit of capacity. Some engineers have suggested that we should build cheaper and less economical stations. This is an unsatisfactory answer to the problem. The proper answer is to maintain the high standards of efficiency that have been established and reduce the cost of construction by intensive study and better design. Better engineering in the future is the answer to the problem. By the use of large turbine generator units and large steam generating units, the unit cost of construction can be reduced materially. The present practise of installing several boilers to serve one turbine generator increases the cost of construction. The use of large steam generating and turbine generator units will reduce the unit cost of high-pressure stations more than it will reduce the unit cost of normal pressure stations. If the steam generating units match the turbine generator units in capacity, we can design for unit construction. This unit construction will not only reduce the cost of construction but will also simplify operation. View full abstract»

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  • Electrochemistry and electrometallurgy: Annual report of committee on electrochemistry and electrometallurgy

    Page(s): 878 - 881
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    To the Board of Directors: The Committee on Electrochemistry and Electrometallurgy submits the following report covering some of the outstanding matters of interest within the field of the committee. Such a review can never claim to be complete. The past year has brought several items of unusual interest. As an innovation in the report of the committee, for the present year somewhat more details are given about certain materials and their production, including the features likely to be of interest to electrical engineers. For this reason, the number of items covered in the report is somewhat less than in the reports for the several years preceding. View full abstract»

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  • An economic study of an electrical: Distributing station

    Page(s): 881 - 883
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    This paper outlines some of the physical reasons and economic advantages influencing the establishment of Washington Park Distributing Station of the Commonwealth Edison Company of Chicago. This station is located at the electrical center of the load which it supplies. It receives energy at 66 kv. from an outlying generating station, State Line Station. The voltage is reduced at the distributing station and fed to a number of substations at 12 kv. The past practise of this company has been to feed the substations at 12 kv. directly from generating stations. However, a study indicated several reasons for discarding the practise in this case. The main physical reasons were the congested condition in the underground cable system surrounding Calumet Generating Station and the distance from Calumet Station to its dependent substations. The economic advantages consisted primarily of the decrease in transmission line costs due to the location of the distributing station at the center of the zone load and the savings resulting from the use of 66-kv. instead of 12-kv. for the primary transmission system. View full abstract»

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  • Abridgment of current transformer excitation: Under transit conditions

    Page(s): 884 - 888
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    Tests of circuit breakers, relays, and similar devices in which current transformers have been used to step down the large currents involved to values measurable by the oscillograph, have shown peculiar errors in the records during the transient portion of the current wave. The purpose of this paper is to show that the abnormal excitation of the magnetic circuit of the current transformer required during transient conditions is the cause of these errors, and to point out how the errors may be minimized sufficiently to be negligible. Mathematical expressions are also derived to make it possible to predetermine the ability of a transformer to handle transients correctly and to be a guide in the design of transformers for this service. View full abstract»

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  • Transportation: Annual report of committee on transportation

    Page(s): 888 - 890
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    To the Board of Directors: Following established precedent, your Committee submits a brief review of the year's development in the application of electricity to transportation. View full abstract»

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  • Abridgment of progress in the study of system stability

    Page(s): 891 - 895
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    In the second part of this paper and in the appendices, attention is given to simplified methods of treating the problem of system stability. Methods which have been found useful in making many system studies are recorded. These methods have had considerable verification by tests both on a model system and on large operating systems and have been simplified to such an extent that many operating companies are now finding it to their advantage to undertake the work of making careful studies of their own systems, just as they now make short-circuit studies which formerly were thought too difficult and too highly theoretical. The first part of the paper gives some comments and conclusions of the authors and their colleagues as a result of many such system studies as well as studies involving more detailed methods, and also as the result of practical experience through contact with various operating companies. Some of these comments are based directly upon an example which is given in detail in Appendix I. View full abstract»

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  • Applications to marine work: Annual report of committee on applications to marine work

    Page(s): 895
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    To the Board of Directors: The activities of the Committee on Applications to Marine Work this year were devoted chiefly to the consideration of future revisions in the Marine Standards (A. I. E. E. Standard No. 45) and in further efforts to induce the U. S. Steamboat Inspection Service to arrange for proper recognition and classification of the electrical engineer on shipboard. Owing to the few active matters for consideration by the committee, and the unusual activity in new marine construction placing a large demand upon the time of most of the committee, the meetings of the committee were curtailed. View full abstract»

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  • Abridgment of general power applications: Annual report of committee on general power applications

    Page(s): 896 - 900
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    To the Board of Directors: Your Committee on General Power Applications has attempted to keep in close touch with the development of power applications during the year through the selection by the various members of the committee of specific industries in which they were deeply interested and on which they agreed to furnish a condensed report early in 1929. View full abstract»

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  • Spray and fog tests on 220-kv. insulators

    Page(s): 900 - 904
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    To determine insulation for an outdoor 220-kv. station on the coast subject to ocean spray, an insulator test rack was installed at Redondo, California. Ten types of insulator, including widely different designs, were tested continuously for two years and a half at 150 kv. to ground. Comparative results were obtained by adding or subtracting units in suspension strings until an equality against arc-over was approximated. Ninety arc-overs occurred. The surface leakage resistance was found to be a fair index of the resistance to arc-over under salt spray conditions. The shape of the insulator made no difference as long as the total surface resistance of the string remained the same. The surface resistance is that calculated upon the assumption of a uniform conducting coating upon all the exposed surface of the insulator and is the line integral of distance divided by circumference along the shortest surface path from cap to pin. Accidental differences of conditions are such that one insulator string would not consistently arc-over in preference to another unless its surface resistance were less than 80 per cent of the other. Suspension strings having a total surface resistance of 11.0, using inch units, were found satisfactory for a steady 150 kv. to ground under the conditions at Redondo. A spray method of cleaning insulators while energized was devised. View full abstract»

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  • Applications to mining work: Annual report of committee on applications to mining work

    Page(s): 905 - 907
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    To the Board of Directors: In the past many criticisms have been made against the mining industry as being backward in modern developments. Certainly such criticisms are no longer justified to the same extent as a decade or two ago. View full abstract»

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  • Audio-frequency transformers: Voltage-ratio characteristics determined by the low-voltage cathode ray oscillograph

    Page(s): 907 - 911
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    The usual method of determining the voltage ratio of audio-frequency transformers employs a three-element vacuum tube in the circuit. Due to the fact that the results are a combination of both transformer and vacuum tube characteristics this method is not entirely satisfactory. This paper describes a new method, using a low-voltage cathode ray oscillograph, by means of which the voltage ratio of a transformer is determined independent of any other apparatus This newly developed method is accurate and simple in operation, and gives the actual characteristics of the transformer for all frequencies and d-c. components. The ratios of several makes of transformers were determined over a frequency range of 20 to 10,000 cycles and at different degrees of magnetic saturation. The results indicate that the ratios are very good between frequencies of 40 and 3000 cycles. Saturation within the usual operating limits was found to have little effect. The method developed was found to be exceptionally good, as the results are accurate and are readily reproduced. However, precautions must be taken to eliminate stray fields which may influence the tube unless properly shielded. View full abstract»

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  • Abridgment of automatic stations: Annual report of the committee on automatic stations

    Page(s): 911 - 912
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    To the Board of Directors: This terminates the second year of the existence of this committee. The field of action in which this relatively new committee finds itself is so broad and has so many inviting byways that it has been difficult to outline the work. The engineering connection with the application of automatic control is so fascinating as to result in so many new ideas being steadily developed that sometimes the fundamentals are almost overlooked. In the following report, this committee attempts to outline some of the development and offer suggestions which are intended to benefit this branch of the industry. View full abstract»

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  • Abridgment of production and application of light: Annual report of committee on production and application of light

    Page(s): 913 - 917
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    The report of the Committee on Production and Application of Light calls attention to the outstanding advancements and trends in the art of lighting by electricity. Material used in the compilation has been furnished not only by members of the committee but by other authorities in various fields. View full abstract»

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  • Illumination items: The electrical engineer and light therapy

    Page(s): 917 - 918
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    The popularity of the present suntan vogue and its hearty endorsement by prominent members of the medical profession point to the probability of the demand for artificial sources of sunshine being permanent rather than the fad of a day. View full abstract»

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  • Mobile color lighting at Barcelona exposition

    Page(s): 918 - 919
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    From the standpoint of mobile color lighting, the International Exposition held this year at Barcelona, Spain, is the most exquisite display of its kind ever produced. It is particularly interesting as to the quantity of colored light employed and the extent of the area over which coordinated sequence is maintained, In length, this area is approximately one-third of a mile. and in width it averages 350 ft. Both as to colors and intensities, this widespread synchronized mobility is controlled through a multiplicity of circuits which appear hopelessly intricate until the systematic desing and arrangements are understood. The apparatus, to control automatically the changing colors, (5000-kw. connected load), cost approximately $250,000.00 exclusive of freight, erection, wiring, or the electric distribution system. View full abstract»

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  • The motor vehicle light testing laboratory of Minnesota

    Page(s): 919
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    The regulations with respect to automobile headlamps, included in the Uniform Traffic Act of the State of Minnesota, have now been in force for over two years. View full abstract»

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  • The 1930 Winter convention

    Page(s): 920 - 921
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  • District meeting in Chicago

    Page(s): 921
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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