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Electrical Engineering

Issue 2 • Date Feb. 1950

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Displaying Results 1 - 25 of 55
  • [Front cover]

    Page(s): c1
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  • [Advertisement - Front inside cover]

    Page(s): c2
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  • Contents

    Page(s): 1A
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  • [Advertisement]

    Page(s): 2A
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  • Highlights

    Page(s): 3A
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  • [Advertisement]

    Page(s): 4A - 12A
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  • Why didn't the president visit our section?

    Page(s): 97 - 98
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    THE MOST ENJOYABLE part of being President of the Institute is the round of Section visits which is by tradition one of the President's duties. Everywhere he goes he is most cordially received. The hospitality of the Sections is apparently limited only by the adherence of the President to his schedule. He has the opportunity to meet old friends and to make new ones. He has the privilege of informing the members about the institute's work and its problems. He gains new and broader viewpoints on the organization's activities and senses the needs and aspirations of the membership. He receives inspiration from the interest and enthusiasm of the Section officers. If he takes the relatively little additional time required to travel by automobile he sees the country at close range and enjoys Nature in all her moods. In a very real sense, his tours are the equivalent of a series of vacations. View full abstract»

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  • Differentiating characteristics of an engineering curriculum

    Page(s): 99 - 101
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    THERE HAS BEEN a steady increase in specialized branches of engineering during recent years. Some of these are simply specializations in functional engineering, such as welding engineering, tool and die engineering, petroleum engineering, and refinery engineering. Others are associated more closely with the basic sciences, as, for example, geological engineering or engineering physics. Still others tend toward the border line of business, such as administrative engineering or general engineering. View full abstract»

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  • Sudden load reduction in a steam power plant

    Page(s): 101 - 106
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    WITH a generating capacity considerably in excess of its local busload, the Sherman Creek generating station of the New York Consolidated Edison Company has to depend on one high-capacity tie to connect it with the rest of the system. Use of the major portion of the plant's capacity, therefore, depends on this tie feeder to transmit all of the plant's output that is not needed for the local bus load. At certain times the plant generates ten times the local load. View full abstract»

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  • A bushing design for high altitudes

    Page(s): 107
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    THE STEADILY INCREASING USE of electrical components at high voltages and altitudes has presented a problem in the design of bushings to meet the requirements of being corona- or radio-interference-free in the range of 10,000 volts and altitudes of 50,000 feet. View full abstract»

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  • A wide-range adjustable-speed drive

    Page(s): 108
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    WHEN a d-c series motor is supplied with a voltage which is proportional to its current, its speed is essentially constant for various values of output power. The operating speed of the motor is directly proportional to the rate of change of this voltage with respect to the current. View full abstract»

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  • Television terminals for coaxial systems

    Page(s): 109 - 115
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    THE broad features of the operation of the L-1 coaxial system for the transmission of television have been public for more than a year,1 but thus far the factors influencing the design of the coaxial television terminals and a detailed discussion of the equipment now in service in the Bell Systems' television network have not been published. The television terminals here described were placed into network service in 1947, but in basic form are similar to experimental models developed prior to the war and used in early television transmission studies over the coaxial cable.2,3 View full abstract»

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  • Justification of Heaviside methods

    Page(s): 116
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    THE METHODS of Heaviside for solving differential equations commonly arising in problems of engineering and physics, are of great value and are very widely used. However, Heaviside did not fully justify his methods, saying that “reservations should be learned by experience.” Mathematicians, therefore, have generally preferred to approach the same goals by use of the Laplace transformation. However, the recent work of the French mathematician, Laurent Schwartz, provides justification of Heaviside's methods, and opens the way to their wider use. View full abstract»

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  • Transformer heating under short-circuit conditions

    Page(s): 117
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    THE TEMPERATURE LIMIT under short-circuit conditions has been 250 degrees centigrade for power transformers for many years. This temperature has been calculated assuming that all of the heat during the short circuit has been stored in the copper. There is good reason to believe that a temperature of 250 degrees centigrade is seldom reached under short circuit; first, because some of the heat is conducted to the turn insulation; second, full voltage is not maintained unless the kilovolt-ampere capacity of the transformer is small in comparison with the source of power; and third, the protective relay usually comes into action before the time limit is reached. View full abstract»

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  • Power transmission in Northern California

    Page(s): 118
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    THE HISTORY of power transmission in northern and central California and the interconnection of hydroelectric and steam-electric plants dates back to just before the turn of the century. Development of water power was given impetus by the earlier uses of water in mining operations. The availability of petroleum fuels encouraged construction of steam plants in areas lacking in hydro power, or where it was needed for purposes of assuring the power supply in low water periods, or in case of interruption of long transmission circuits. View full abstract»

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  • Cable accessory design utilizing new laboratory techniques

    Page(s): 119 - 124
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    IN RECENT years the introduction of high-pressure fluid-filled cable systems for power transmission and the trend toward higher voltages have posed new problems in the design and construction of cable joints and potheads. Certain laboratory techniques have contributed much to the solution of these problems by providing the designer with accurate information and the producer with dependable test methods. View full abstract»

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  • Oscillographic study of hydroelectric units

    Page(s): 125
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    AMAGNETIC oscillograph, with auxiliary equipment, has been found useful at the Grand Coulee Power Plant, Columbia Basin Project, for obtaining information about operating characteristics of hydroelectric units which cannot be obtained from the ordinary indicating and recording instruments. Quantities recorded include mechanical movement, hydraulic pressure, bearing loads, and turbine vibration and noise. View full abstract»

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  • Directional current circuit protector

    Page(s): 126
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    IN MODERN AIRCRAFT the increasing use of electric equipment has increased the dependence of the aircraft on the electric system. To improve the reliability of this system additional fault protection is necessary. View full abstract»

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  • A one slip cycle out-of-step relay equipment

    Page(s): 127 - 129
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    WHEN the out-of-step condition develops on a power system, the resulting disturbance may result in a major loss of load. It is, therefore, desirable to be able to recognize such a condition promptly and to take corrective measures to minimize the disturbance. This article describes a new relay equipment which is capable of recognizing an out-of-step condition before the completion of the first slip cycle, whereas earlier forms of out-of-step relays did not usually give an indication until after the third slip cycle. View full abstract»

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  • Deionization time of fault-arc paths

    Page(s): 130
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    AUTOMATIC RECLOSING of circuit breakers in high-voltage transmission lines can increase system transient stability limits provided reclosure can be accomplished rapidly. Minimum time of reclosure is dependent largely on the rate of dielectric recovery of the ionized fault-arc path. Data on deionization times of fault-arc paths have been obtained from tests on a 115-kv system. View full abstract»

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  • Latin America and the young engineer

    Page(s): 131 - 133
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    IN HIS Inaugural Address in January 1949, President Truman declared that the United States, in co-operation with the United Nations and with other governments, should attempt to pool the technical knowledge and skills of the more advanced countries to stimulate the progress of the underdeveloped countries. Conceived as a “bold new program” to provide “triumphant action … against the hunger, misery and despair” for the world's free people, it has been very widely commented upon and discussed as the “Point Four” program. View full abstract»

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  • Fault locator for high-voltage lines

    Page(s): 134
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    THE LOCATION of high-voltage power line faults has received considerable attention during the postwar years. Three systems of locating faults by echo-ranging means have been covered in previous papers.1,2 View full abstract»

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  • Modern carrier current test equipment

    Page(s): 135
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    DURING the past 20 years the carrier system of the Pacific Gas and Electric Company has advanced from two simple carrier circuits serving a total of seven terminals to the present system consisting of some 45 circuits and nearly 100 terminals. The system includes relay carriers, telemetering, and remote alarm systems. Some installations employ simple amplitude modulation, other installations transmit only one side band, while others employ frequency modulation. View full abstract»

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  • Heating of transmission line clamps

    Page(s): 136
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    MAGNETIC HEATING of suspension and strain clamps has received increased design consideration because of higher transmission line currents. The temperature rise of conductors with sustained load currents of several hundred amperes may be excessive inside all-ferrous clamps. At these currents, a decrease in clamp magnetic power loss to reduce temperature rise may justify, economically, the purchase of more expensive nonmagnetic clamps. View full abstract»

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  • Power costs of bituminous coal mines

    Page(s): 137 - 140
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    THE TRENDS and amount of elecric power use and cost at bituminous coal mines are of interest to the executive, the operating man, and the engineer alike. A study of the data based on a single year, or even a few years, could result in misleading conclusions; but the data from over 400 representative mines for the past 26 years make it possible to determine the trends quite accurately. These trends, illustrated by graphs and tables, are discussed in this article. View full abstract»

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Aims & Scope

This Periodical ceased publication in 1963. The current retitled publication is IEEE Spectrum.

Full Aims & Scope