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Volume 45, Issue 448
Displaying 1-11 of 11 articles from this issue
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SADATOSHI BEKKU1925 Volume 45 Issue 448 Pages 941-957
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn this paper, the Method of Symmetrical Co-ordinates which was developed and published by Mr. C.L. Fortescue in Trans. A.I.E.E. 1918, is explained as simple as possible to the use of various three phase problems.
The explanation was made by following those published by the author in Researches of the Electrotechnical Laboratory No. 129; E.T.Z. April. 30, 1925; Archiv fur Elektrotechnik, Juni. 1925 and G.E. Review July 1925. The equati n of the terminal voltage of the symmetrical three phase alternator under unbalanced current was obtained and the method of calculation of current in case of various faults, for instance one line ground, line to line short-circuit etc. was explained.
Then the author considered any complicated three phase network as a simple symmetrical alternator by imaging fictitious terminals at the point of fault. And the method of cal ulation of current for various faults on any point of the extended three phase network was described with an example studying the stability of the synchronous machine connected at the receiving end.View full abstractDownload PDF (1084K) -
TATSUO ISHIYAMA1925 Volume 45 Issue 448 Pages 958-964
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe ever increasing traffic in the e'ectric railway system demands the further increase of the number and capacity of the substations. Thus the requirements of parallel working of ro ary convcrters in one subtation and between the others with the prevalent compound wound rotary converter, will often cause troubles. In order to cbtain the standard diroct current voltage of 1500 for the long distance electric traction from 50 60 cyele alternating current supply mains, the present practice is to connect two 750 volts rotary convertes in series. In this case the compound wound rotary converter will make a certain complica tion in wirings as well as switch gears. On the contrary, the shunt wound rotary convorter saves these troubles. The auther investigated the amount of t e voltage dro of direct current side of shunt wound rotary converter under load by means of ve tor diagram and actual test and noticed its comparatively small voltage reaulation.This is why he wite this esay which is divided nto thre chapter, viz.,
(I) Necessity for the adoption of the shunt wound rotary converter.
(II) Voltage drop of direct currant side of the shunt wound rotary converter.
(III) The snitable reactance drop of the accompanying transformer for the shunt wound rotary converter.View full abstractDownload PDF (447K) -
[in Japanese]1925 Volume 45 Issue 448 Pages 965
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (60K) -
YASUKE ANZO1925 Volume 45 Issue 448 Pages 966-989
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe author, an electrical engineer of tha Tokyo Electric Light Co. Ltd., Tokyo, recently reterued from his trip through United States, Canada and Europe, touching Bombay on the way to home. And from his inspection he explained here a few notable point in American and European practice for power station, transmiss'on line and under ground cable.
For water wheels, common reaction type s so far developed that efficiency of higher than 90 percent is easily obtained, and now water wheel makers in U.S. and Europe are studying about low head high speed runner, such as Nagler, Moody, Kapla, La aaczeck etc. As large ones in capacity or size, 30000HP runner at La Gabell or 10000HP runner at Lilla Edet may be mentioned.
In big power stations, large unit is generally adopted and we see 60000KW units in American and German plants. In power stations feeding high voltage lines, generator and transformer are treated as a single unit and sometimes generator bus bars are omitted as those plants at Hudson Av. Trerton channel, La Gabell, Barkin Genne illier walehensee. Differing from American practice, oil circuit breakers of multi-break type or those provided with protective resistance are extensively used in Europe, but installation of truck type switches is increasing in both siles, for simplicty of erection, economy of land and building and safety of operation and maintenance. Iron clad type switehos are developed specially in England.
Quite number of at ndantless power stations and substations are in servic in U.S., but rem to controling s stem is not yet commor.
Transforming ap aratus of American power stations are generally of outdoor type, while those of Conadian and European stations are of ind or type, as may be seen in the plants of Winnipeg, Shawnigan Falls, Waggithal, Gollenberg, Wahhensee and others. This is chiefly due io we ther condition and partly due to the fact that for high voltage apparatus, paper insulator is developed more rapidly than porcelain insulator in Europe. But it is reported that outdoor type apparatus of Bjolvo foss power station in Hardanger Fjord, one of very wet districts of western coast in Norway, have not got any remarkable troub e.
As for high voltage trans nission line, two 220K.V. lines are in operation in California and many 100-150K.V. lines are in U.S. and Europe. In the continent, especially Germany has wide net work of 110K.V. line in Middle Germany, Bayern, Pheinland and Baden.
Am rican tower is of wile base type but European is of narrow base type. The size of line conductor in the Continent generally is not so large as in U.S. American suspension insulator is cap and stud ce ented type, extensiie material being applied on cemented surface and cemente being hardened in hot steom. But in Europe, susponsion insulators with much reduced amount of cement or without cement is usually favoured and such insulators as Untra, spherical head (Kngel Kopf), Conical head Kegel Kopf, Motor and "V" are put on market. As may be expected, insulators in Northern countries of Europe depreciate very slowly, while those in India very rapidly. And in Bombay, almost all cemented insu aters on 100K.V. line are taken down and H welet or J.D. insulators are put in pl ce.
Transmission tower carries generally one ground wire, but in a German plant, we see three wires hung on a few towers only in the neighbour hood of power station or substation.
As for commu icating means, high frequency telephone is snccssfully used, in addition to private telephone, public teleph ne and leasel telephone. For American high flrequency telephone, an antenna wire is carried on trausmiss on line towers, but for European one, a special condenser is connected to a line co ductor instead of an antenna wire and consequently p wer required for this apparatus is considerab y small.View full abstractDownload PDF (3410K) -
T. NAKAGAMI1925 Volume 45 Issue 448 Pages 990-1023
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSVarious items of business and foreign radio communications of the following four big radio companies in the world are described.
(1) Radio Corporation of America (U.S.A.)
(2) Marconi's Wireless Telegraph Co. Ltd., (Great Britain)
(3) Telefunken; Gesellschaft fur Drahtlose Telegraphie m.B.H. (Germany)
(4) Compagnie General de Telegraphic Sans Fils (France)
Also for each radio system adopted by each company, special engineering points on transmitting set, receiving set, antenna and earth system are explained in the following orders.
(1) Radio Corporation of America.
(a) Alexanderson generator and its speed regulation.
(b) Magnetic amplifier as keying device.
(c) Multiple tuned antenna.
(d) Broadside antenna and long wave receiving set.
(e) High speed transmitter and ink recorder at Central Office, New York.
(2) Marconi's Wireless Telegraph Co. Ltd.
(a) Vacuum tube transmitters.
(b) Earth screen.
(c) Marconi Bellini Tosi antenna and long wave receiving set.
(d) High speed transmitter and receivcr at Radio House, London.
(3) Telefunken Co.
(a) High frequency generator and frequency transformer.
(b) Flat top polygon antenna on insulated towers.
(c) Balanced earth system.
(d) Double goniometer receiving system.
(e) High speed transmitter and receiver at Betrieb Central, Berlin.
(4) Compagnie General de T.S.F.
(a) Latour high frequency generator and Thury speed regulator.
(b) Flat top L type antenna.
(c) Multiple earth system.
(d) Bellini Tosi antenna and receiving set with anti-parasite device.
(e) High speed transmitter and recorder at Bureau Central, Paris.
Besides comparisons of each system are discussed on antenna effects of high power stations, frequency variation of emitted waves, etc of high power stations belonging to these companies or its associated companies.View full abstractDownload PDF (6845K) -
W. MIYAMOTO1925 Volume 45 Issue 448 Pages 1024-1034
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESS1. A brief description is given as to the method and result of the accuracy test of the synchronizing fork, the aim of the test being to judge the propriety of the synchronizing fork as used in the calibration of the wave-meter.
2. In the test was u ed the clock-work tachometer, which was deviced by the author and which gives fairly accurate result.
3. It was found that the result besomes the more accurate, the smaller the l ad is and also the larger the contact-gaps between the fork and A.C. terminals are. It was as as ertained, that when the voltage of D.C. source varies the accuracy becomes unsatisfactory accordingly, the author emphasizes the necessity of using storage batteries as the source of power.View full abstractDownload PDF (1015K) -
T. OTAKE, N. KATO1925 Volume 45 Issue 448 Pages 1035-1049
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAn approximate calculation of the mean torque acting on the rotating disc of induction type watthour meter was given in this journal last year under the following assumptions;
1) the disc is extremely thin,
2 the magnetic flux is known and confined under the magnetic pole, elsewhere it is zero.
3) the magnetic pole is a circle and the magnetic induction is uniform within it. But this result is not perfect, as in its deductions the higher orders of the series were neglected in order to simplify the calculations. So in this work the mean torque is determined starting from the assumptions above stated, which are the same as used in the above cited papers, but making no neglect as has been done previously. The result of this calculation shows us that the mean torque can be determined by supposing the total magnetic flux concentrated at the center of its own circulur magnetic pole and the inversion of its center, instead of the center of its own pole and the inversion of the magnetic pole as in the previous result.View full abstractDownload PDF (547K) -
JUSUKE OKOCHI1925 Volume 45 Issue 448 Pages 1050-1054
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSA new method of measuring spark lag is stated in the present paper, an outline of this method is as follows. Noninductive resistance and inductance are connected to the spark gap in parallel at first, next sparking voltage is supplied from charged condenser, and then instantaneous value of current, flowing in the R. L. circuit, is measured at the instant when spark over take place at the spark gap, then we obtain the spark lag by calculation from this value of current and circuit constants.
Few experimental results are shown in the last part of this paper.View full abstractDownload PDF (312K) -
M. SHIDA1925 Volume 45 Issue 448 Pages 1055-1069
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn a 3 phase V-connection of transformers, the unbalancing of the voltages of three terminals to the ground occurs sometimes. This is due to the unbalance of electrostatic capacities existing between the coi's and between the coils and the core of transformers.
This unbelancing of voltages can be compensated by means of condensers inserted between the terminals and the ground.View full abstractDownload PDF (757K) -
M. IWATAKE1925 Volume 45 Issue 448 Pages 1070-1073
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn 1922, Wagner published the break down theory of solld dielectrics.
The Wagner's the ry is now applied to explain the author's experiments about the time lag of spark in solid dielectrics and is found to hold good for various materials except mica and glass.
This paper consists of the following articles.
§1. Introduction
§2. Wagner's break down theory of solid dielectrics
§3. Explanation of the time lag of soark in solid dieleclrics aecording to Wagner's theory
§4. C nclusion Appendix Reference papersView full abstractDownload PDF (189K) -
H. MARUYAMA1925 Volume 45 Issue 448 Pages 1074-1093
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe paper discusses relative merits and demerits of rotary converter and mercury rectifier viewed from operating standpoint. And it consist of the following chapters. 1. ntroduction, 2. Rating, 3. Efficiency, 4. Voltage regulation, 5. Power factor, 6. Reliability, 7. Floor space, 8. Miscellaneous operating problems, 9. Conclusion.
Many comparative tables and curve were worked out. Efficiency curves of 300K.W., 500K.W., 750K.W., 1000K.W. units each for 600V. and 1500V. are represented.
The writer suggests that capacity factor should be taken into consideration for the comparison of two apparatus of different ratings for such case as under question and shows with curves the effect of capacity factor upon the light load efficiencies.
In conclusion the writer points out the difference of efficiency between the two apparatus is not so remarkable that the selections should be determined after the close investigation of all factors said above.View full abstractDownload PDF (1572K)
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