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Volume 46, Issue 452
Displaying 1-9 of 9 articles from this issue
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JIN TACHIHARA1926 Volume 46 Issue 452 Pages 219-240
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (280K) -
MITSURU MASHIKO1926 Volume 46 Issue 452 Pages 241-250
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe characteristics of a constant-voltage transmission system with threewinding transformers at receiving end, the tertiary windings of which being connected to synchronous condensers, are expressed by elliptic equations. Circle diagrams, which are generally used for ordinary lines, will be deduced from the elliptic equation by taking the caefficient k in the equation as unity, since it is a special case where the condenser terminals are identical with the secondary terminals of transformers.
The autsor, therefore, treats the elliptic equation as a general solution and investigates the following cases:- (1) simple transmission sgstem (2) system with two receiving ends. (3) system with two generating ends
Furthermore, it is Shown in this paper that the performance of a transmission network are the combination of those in the later two cases.
As a result of this investigation, it is fouud that precautions should especially be payed for some terms as follows:- (a) The voltage and charging current at any point midway in the line change with the amount of load even in a constant voltage trausmission system. For this effect, obliges those power-station on the way to regulate their own voltage to a suitable value in accordance with the-load. (b) On the system with including many power stations, total generating power varies with the change of power factors of each station for a constant power recelved; and in general the former will increase if leading currents are delivered by some stations. Therefore, proper powcer-factors must be chosen for e ch station so as to make the total generatin power to a minimum. (c) Economical power limit of transmission of a system may be obtained by a proper determination of relative capacity of each winding of three-winding tran formers.View full abstractDownload PDF (1312K) -
H. YAGI, K. UNNO1926 Volume 46 Issue 452 Pages 267-272
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSTests on corona are made with apparata of concentric cylinder type, the high voltage at 50 cycles per sec. being supplied form a 100, 000 volt testing transformer.
The oscillograms of corona in air show that:
1. The crest of the current wave coincides in phase with that of the voltage wave,
2. With increasing corona current, the critical voltage (instantaneous value) becomes lower.
When solid dielectric is made to surround the corona rod:
1. The crest of the current wave advances in phase with respect to the voltage wave,
2. The apperance in each cycle of the negative corona accompanies high frequency oscillations.
The solid dielectrics tested are glass and paraffin.View full abstractDownload PDF (299K) -
S. UDA1926 Volume 46 Issue 452 Pages 273-282
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis paper is the first report of experimental researches on the wireless beam of short electric waves of few metres. The method of generating continuous waves of ultra radio frequencies is the same as already stated by the author in the J. I. E. E. of Japan. The electric intensities of the field due to the oscillator itself (without antennae and reflectors) are observed at first in various directions around it. In this case the plate and grid coils in the osc<llation circuit form the radiators of short radio waves. The distribution of electric field intensities in the horizontal plane containing the oscillator is not uniform in all directions and the maximum values of their vertical components exist in the directions of the plane of the plate and grid coils, but in these directions the horizontal component is negligibly small. On the other hand, in the directions normal to the plane of the plate and grid coils, the vertical component of the field intensi ies almost vanishes while the horizontal components show maxima in these directions, although their values are too small to compare, a the same operating conditions, with that of the vertical components in the former case. As the antenna or the radiator, a slngle brass rod of 2.2 metres in half wave 1 ngth. may be used and its effect upon the field intensities and distribution (around the cscllator) is observed, when the antenna is placed in various positions near the osc lltor. It is also stated that the unidirectional fiald can be easily obtained by the combination, of several antennae or radiators. For this purpose, a simple device is proposed three rod antnnae attached to the transmitting apparatus in a suitable arrangement, and the resints of experimental studies on this method are shown.View full abstractDownload PDF (686K) -
KIKUJIRO OSUMI1926 Volume 46 Issue 452 Pages 283-298
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe present paper describes a method to obtain the time and space distribu tion of transient magnetomotive force in the commutating zone of synchronous converters, when a sudden change of load occurs. The transient values of direct and alternating current components in the armature are calculated, taking all of the following factors into account; the synchronous and asynchronous torques, the inertias of rotating parts, the inductance of d. c. circuit, the effect of speed on the output of the machine etc. The direct and alternating current magnetomotive forces are then calculated separately, by the formula developed by Professor T. Yamamoto, and the resultant of these two is taken as the actual M. M. F. on the surface of the armature. As a numerical example, this method is applied to the calculation of the transient M. M. F. of a 1000 K. W., 600 volt, 6 phase shunt wound converter, under the sudden change of 500% load.View full abstractDownload PDF (650K) -
YASUSI WATANABE1926 Volume 46 Issue 452 Pages 299-310
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAlthough many dynamic methods of determining the valve constants at audio-frequency have been deviced by many investigators, the radio-frequency method has not been known, as far as the writer is aware.
In this paper, one of the radio-frequency methods is treated. The prin_??_iple of this new method consists in determining the variation of input admittance, which depends upon the valve constants.
In the previous paper on "Input Admittance of Triode Valve" by the same author, it is concluded that the circle diagram of the input admittance dependsupon the circuital constants as well as the valve constants. Cousequently it enables us to determine the valve constants from any measured results corresponding to the circle diagram.
Some examples of determination at radio-frequency of 100, 000 cycles per sec. are written, and it is concluded that the valve constants are literally constant independent of the frequency within the writer's experiments.
Moreover, some experimental results are given with respect to the input admittance at radio-frequency.
Besides this method above deseribed, another simple method of bridge measurement can determine the constants at radio-frequency. This topics is treated in the journal "Denki-Hyoron" Jan. 1926.View full abstractDownload PDF (596K) -
T. HOASEI1926 Volume 46 Issue 452 Pages 311-318
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIt is expected that, under exceedingly high frequencies, the action of a condenser would be modulated from that under low frequencies. The writer fried some mathematical studies on the same problems with respect to the parallel plate condenser.
The result is that; The equivalent capacitance at exceedingly high frequencies is independent of its specific capacitance at low frequencies and inversely proportional to the specific resistance of the condenser plates and the impressed frequency.
For ordinaly condensers it need not to consider such a frequency effect on the capacitance unless the frequency is so high as some hundred million cycles per second.View full abstractDownload PDF (300K) -
SHIGEO MOCHIZUKI1926 Volume 46 Issue 452 Pages 319-324
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe motion of the microscopic substances in t ansformer oil is investigated for the case:-
(1) With needle and plane electrodes.
When the voltage undei critical value is applied for the electrodes at large spacing, the microscopic substances migrate by the dielectric field only, i. e. towards the needle electode. Above the critical voltAge, however, the circulation towards the plane electrode appears by the ion pressure, as the oil next to the needle electrode is very highly stressed.
For the electrodes at short spacing, the migration towards the needle electrode tends to disappear, because the attractive force due to the dielectric field, a little apart from the centre line of the electrodes, more rapidly decreases at short spacing compared with that at large spacing.
(2) With sphere electrodes.
The microscopic substantes migrate towards the comparatively large fibrousmaterials partly bridged across the gap, therefore the sence of the eddy current in this case depends on the dielectric field only.
(3) The wave form of the applied voltage is explained by the Lichtenberg's figure on the rotating film.View full abstractDownload PDF (1310K) -
M. IWATAKE1926 Volume 46 Issue 452 Pages 325-328
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn this method, when a spark passes across a gap, an electric impulse travels along two equal paths to two electrodes placed in contact with a photographic plate, and Lichtenberg figures are produced on this plate.
The shift of meeting line of the two unequal Lichtenberg figures from the half-way position due to known high resistance in the path to one electrode is utilized to measure unknown high resistance.
This paper consists of the following articles. _??_ I. Introduction _??_ 2. Relation between Lichtenberg figure and high resistance _??_ 3. High resistance measurement by Lichtenberg figure _??_ 4. ConclusionView full abstractDownload PDF (669K)
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