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Transactions of the American Institute of Electrical Engineers

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• [Breaker page]

Publication Year: 1918, Page(s): i
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• [Breaker page]

Publication Year: 1918, Page(s): ii
| PDF (13 KB)
• Contents

Publication Year: 1918, Page(s):iii - iv
| PDF (142 KB)
• Lightning Arrester Spark Gaps

Publication Year: 1918, Page(s):833 - 869
Cited by:  Papers (2)
| | PDF (4358 KB)

This paper describes a new form of high-voltage lightning arrester gap which has been called the impulse protective gap'' because of its particular effectiveness in protecting against line disturbances of steep wave front. The paper opens with a brief resum?? of some of the results of previous investigations of the subject of impulse voltages. A discussion of the points involved in securing adeq... View full abstract»

• The Oxide Film Lightning Arrester

Publication Year: 1918, Page(s):871 - 880
Cited by:  Papers (1)
| | PDF (3142 KB)

A short history of lightning protection of electric systems is given, as relating to the three successive types of electric circuits; the communication circuits, the power circuits of negligible electrostatic capacity, and the high-power circuits containing distributed capacity and inductance and capable of electric oscillation, leading to the three problems of discharging over-voltage to ground, ... View full abstract»

• The Oxide Film Lightning Arrester

Publication Year: 1918, Page(s):881 - 896
| | PDF (1677 KB)

The oxide film arrester is a new type of lightning arrester made up of a film of insulation in contact with a conducting powder. Upon the application of over-voltage, the insulation will be pierced, but the powder will very rapidly turn into insulation and plug any holes punctured in the original insulation by the over-voltage, thus forming in substance a resealing insulation. A brief description ... View full abstract»

• The Design of Transpositions for Parallel Power and Telephone Circuits

Publication Year: 1918, Page(s):897 - 944
Cited by:  Papers (4)
| | PDF (4736 KB)

This paper presents the results obtained in a recent design of transposition systems for telephone circuits exposed to induction from circuits of other kinds, particularly from three-phase power circuits, and the coordinate arrangements of transpositions in the power circuits. The new arrangements are the result of a systematic investigation of the degree of flexibility which could be obtained in ... View full abstract»

• Engineers and the War

Publication Year: 1918, Page(s):945 - 956
| PDF (1324 KB)
• Electric Power for Nitrogen Fixation

Publication Year: 1918, Page(s):957 - 983
| | PDF (2884 KB)

Reference is made to propaganda against processes for making nitrates from air by those interested in keeping the Allies dependant on supplies of nitrate from Chili. A tabular comparison is made of the operations involved in the indirect method and the direct method of fixing nitrogen. The indirect method involves the manufacture of carbide of calcium and its combination with nitrogen to form calc... View full abstract»

• America's Energy Supply

Publication Year: 1918, Page(s):985 - 1014
Cited by:  Papers (2)
| | PDF (2937 KB)

The gist of the paper is to demonstrate that the economical utilization of the country's energy supply requires generating electric power wherever hydraulic or fuel energy is available, and collecting the power electrically, just as we distribute it electrically. In the first section a short review of the country's energy supply in fuel and water power is given, and it is shown that the total pote... View full abstract»

• Pre-Charged Condensers in Series and in Parallel

Publication Year: 1918, Page(s):1015 - 1025
Cited by:  Papers (1)
| | PDF (953 KB)

A condenser is charged from a source of direct voltage, and then is used as a booster in series with this source to charge another condenser. By repeating this process a large number of times the second condenser is finally subjected to twice the voltage of the source. This is the principle of the Delon apparatus for testing cables, and is explained in a numerical example. Then the more general ca... View full abstract»

• Method of Symmetrical Co-Ordinates Applied to the Solution of Polyphase Networks

Publication Year: 1918, Page(s):1027 - 1140
Cited by:  Papers (210)
| | PDF (7741 KB)

In the introduction a general discussion of unsymmetrical systems of co-planar vectors leads to the conclusion that they may be represented by symmetrical systems of the same number of vectors, the number of symmetrical systems required to define the given system being equal to its degrees of freedom. A few trigonometrical theorems which are to be used in the paper are called to mind. The paper is... View full abstract»

• Sustained Short-Circuit Phenomena and Flux Distribution of Salient-Pole Alternators

Publication Year: 1918, Page(s):1141 - 1208
Cited by:  Papers (2)
| | PDF (5647 KB)

It is shown in Section IV that with the ordinary field forms met with in practise, the resultant flux wave under s. s. c. (sustained short circuits) will be extremely distorted, see Figs. 16, (4th wave) 23, 27, 27A, etc., for the simple reason that with the very low voltages obtained under such conditions, the fundamental of the B-curve of the field is reduced so much by the armature reaction that... View full abstract»

• Reactance of Synchronous Machines and its Applications

Publication Year: 1918, Page(s):1209 - 1340
Cited by:  Papers (36)
| | PDF (13571 KB)

Part I treats of the calculation and application of the armature self-inductive reactance of synchronous machines. A short, reliable method is given in the form of curves, Figs. 20A, B, C, making the calculation from design sheet data a matter of a few minutes. Table I shows a comparison of calculated and test values (obtained from saturation and synchronous impedance curves) for 138 machines, ran... View full abstract»

• Protection from Flashing for Direct-Current Apparatus

Publication Year: 1918, Page(s):1341 - 1365
Cited by:  Papers (5)
| | PDF (11952 KB)

The equipment developed for the protection of direct-current apparatus as described in this paper is applicable to all direct-current apparatus and all methods of operation. Special means of protection for use only with particular apparatus or conditions of operation have not been mentioned. The principal steps in the experimental development of high-speed circuit breakers and flash barriers are b... View full abstract»

• The Automatic Hydroelectric Plant

Publication Year: 1918, Page(s):1367 - 1378
| | PDF (5254 KB)

The automatic hydroelectric generating station of the Iowa Railway and Light Company at Cedar Rapids, Iowa, is a radical step in advance in the elimination of operator's wages in a station of appreciable size, without sacrificina complete control. This station consists of three 400-kw., 500-kv-a., 60-rev. per min., 2300-volt, vertical generating units, tied in to a system, of which the main genera... View full abstract»

• Skin Effect in Tubular and Flat Conductors

Publication Year: 1918, Page(s):1379 - 1403
Cited by:  Papers (59)  |  Patents (3)
| | PDF (1633 KB)

A method is presented for calculating the skin effect resistance ratio of a tube, which is a form of conductor to be recommended for high-frequency work. A formula is also developed by means of which the asymptote to the curve of the ratio R??/R may be drawn, and thus the magnitude of the skin effect at extremely high frequencies may be obtained. The values of the ratio R??/R for tubes of various ... View full abstract»

• A Direct-Current Generator for Constant Potential at Variable Speed

Publication Year: 1918, Page(s):1405 - 1415
| | PDF (1002 KB)

The standing of this problem in the past is briefly reviewed. As far as is known to the author the type of machine described presents a new solution, the advantages of which are shown to be: 1. The machine is self-excited, i. e., regulates independent of any other source of potential. 2. The machine regulates independent of speed and load and may be compounded. 3. The regulation is inherent, i.e.,... View full abstract»

• Critical Review of the Bibliography on Unbalanced Magnetic Pull in Dynamo-Electric Machines

Publication Year: 1918, Page(s):1417 - 1424
Cited by:  Papers (3)
| PDF (602 KB)
• Magnetic Pull in Electric Machines

Publication Year: 1918, Page(s):1425 - 1469
Cited by:  Papers (7)
| PDF (4032 KB)
• Economic Proportion of Hydroelectric and Steam Power

Publication Year: 1918, Page(s):1471 - 1475
| | PDF (463 KB)

This paper describes a new method of determining for any power system, what proportion of generation should be hydroelectric, and what steam, from the standpoint of economics. A method is outlined for obtaining a curve showing Total cost per kilowatt-year for hydroelectric and steam power'', for any percentage combination of generation. With system load curve, fixed charges on steam and hydroele... View full abstract»

• Application of Harmonic Analysis to the Theory of Synchronous Machines

Publication Year: 1918, Page(s):1477 - 1517
Cited by:  Papers (2)
| | PDF (3546 KB)

It is shown that the flux distribution in the air gap of a synchronous machine consists of a series of component distributions that are simple harmonic wave trains, either stationary or moving at constant velocities. Methods are suggested for determining the effects of slots and the saturation of the magnetic circuit on the magnitudes of these component distributions. Expressions for the voltage g... View full abstract»

• Electric Welding-A New Industry

Publication Year: 1918, Page(s):1519 - 1529
| | PDF (6546 KB)

This paper covers a brief review of the uses of electric spot and arc welding in this country prior to the formation of the Electric Welding Committee of the Emergency Fleet Corporation. It compares the status of the art at the present time and emphasizes the developments that have been made in apparatus in the last six months. It treats of the activities of the Welding Committee in applying elect... View full abstract»

• Electric Motors in the Cement Industry

Publication Year: 1918, Page(s):1531 - 1605
Cited by:  Papers (1)
| | PDF (8198 KB)

This paper has been compiled by the Committee on Industrial and Domestic Power to give general information regarding the different classes of machinery used in the cement industry and the sizes and types of motor best adapted for the work. The paper gives, first, a brief description of the process. This is followed by an outline of the various kinds of machinery used together with data as to power... View full abstract»

• Electric Power Generation in Ontario on Systems of Hydroelectric Power Commission

Publication Year: 1918, Page(s):1607 - 1636
| PDF (5249 KB)