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Volume 47, Issue 466
Displaying 1-11 of 11 articles from this issue
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Sadatoshi BEKKU1927 Volume 47 Issue 466 Pages 449-461
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn order to calculate the ground current caused by accidental ground of one line in the three-phase network, it is necessary to calculate positive, negative and zero phase sequence impedance of the whole network viewed from the point of fault. This theorem was explained by the anther in his previous paper. The positive and negative phase sequence impedance can be calculated by the well known method. The zero phase sequence impedance, however, must be calculated by somewhat different manner. The method of calculation of the zero phase sequence impedance of the parallel three-phase transmission line is described in this paper, and the general formula is given.
Proff. Dr. Ing. W. Petersen, who is known by the arc extinguishing reactor "Petersen coil", modified his arc extinguishing reactor for the parallel threephase transmission line by the introduction of "sucking coil" (Saugspule, D.R.P. 387770, 7. Febr. 1920). The principle of the sucking coil was illustrated by its inventor for the case of the concentrated line capacitance. The present author applied his general formula of the zero phase sequence impedance for the sucking coil and showed that the 'coil can be used for any transmission line of the distributed line constants.View full abstractDownload PDF (590K) -
Kenji KATO1927 Volume 47 Issue 466 Pages 462-477
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe recent development in the calculation of a three-phase transmission line owes very much to the method of symmetrical coordinates. For the simplicity of the explanation of the method, however, the papers presented previously to treat the case of the single circuit lines. On the other hand, the practical problem will be to calculate a double-circuit line instead of a single-circuit one, as most of lines with voltages above 66 kilovolts are generally provided with six conductors and they are operated with each two conductors parallel.
The intervening switch-stations serve to cut off a portion of one fo the circuits by means of the relays, in case of faults.
In calculating such a double-circuit line, especially when the six conductors are mounted on one steel tower, the mutual influence between two circuits must, to a certain degree even in the first approximation, be taken into acount. What sorts of line constant shall be calculated; how the zero positive, and negative sequence components of impedances as observed from the point of fault may be found, these are described together with the deduction of the relating formulae.
A numerical example is worked ont for the purpose of showing clearly the process to be taken in calculation, and giving at the same time the quantitative effect of the "solid grounding of the system neutral. Finally the special line constants of a newly built 154k.V. line, which were observed, are app ended as a reference.View full abstractDownload PDF (860K) -
Matsujirô ÔYAMA1927 Volume 47 Issue 466 Pages 478-488
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSSensibility of Moll's thermopile was already calculated in previous paper:(1) now its general solution during the temperature rise is calculated here. And time-constant is discussed for designing quick-acting thermopile.View full abstractDownload PDF (391K) -
1927 Volume 47 Issue 466 Pages 488
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (23K) -
Masamiti SASE, Tiosiro MUTO1927 Volume 47 Issue 466 Pages 489-500
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe principle and the result of the laboratory experiment with regards to the new alternate current potentiometer are shortly explained. This instrument has one superior advantageous feature than Gall's potentiometer; that is the phase difference beween the potentials of its component potentiometers is always rigorously at right angle for all commercial frequencies(20‾200‾).
No adjustment is necessary to set the phase angle accurately in quadrature, if it is used for any frequency within the range above described.
Before measurement, adjustment of the current magnitudes is only necessary. It seems to the authors that this instrument can be operated more quickly than any other a.c. potentiometer, as far as they are aware of, without losing the sufficient accuracy and precision.
The actual construction of the instrument is also very shortly described in the part at the end of this paper.View full abstractDownload PDF (693K) -
M. IWATAKE1927 Volume 47 Issue 466 Pages 501-505
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn this paper, the author describes the results of the break down phenomena of a spark gap under A. C. potential.
The rotating film method enabled him to determine at which phase of the voltage wave the break down takes place.
The time lag of spark of a sphere gap was me sured, especially under variable A. C. potential difference.View full abstractDownload PDF (378K) -
Yasusi WATANABE1927 Volume 47 Issue 466 Pages 506-528
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSFrom the properties of the motional admittance-circle diagram of the piezoelectric resonator, we can determine its electrical equivalent constants. Therefore, any simple and accurate method of measuring the motional admittance is very useful from the point o view of scientific study of the characteristics of the resonator itself as well as of the electric circuit including the resonator, such as a piezooscillator.
In the first place of this paper, the writer treats with some new measuring methods deviced by himself and some experimental results are shown. In the second place, some characteristics of the resonator are investigated for many special cases such as followings;
(1) An apparent equivalent constant of the resonator, when an air gap exists between the resonator itself and its electrodes, are given simply by mathematical treatment of the equivalent circuits and the result is fairly verified with an experimental one.
(2) The relation between the motional admittance and the area of the electrodes are found only experimentally.
(3) By means of two pairs of electrodes, each two of which are connected diagonally, we can change the mode of the resonant vibration from fundamental into its first harmonic one, and also by the same effect, the original first harmonic vibration of resonator made of the twinned crystal of quartz can be changed into the fundamental one.
(4) When the amplitude of the resonast vibration of the resonator is made the more violent, the mechanical loss becomes the more with the result that the diameter of the motional admittance-circle decreases remarkably.
(5) When the mechanical vibrat on is large, the stress at the nodes of vibration is so much increased that the electric field intensity in the air gap between the resonator and the electrode becomes so high enough to start there the sparking discharge. This phenomenon leads us to the idea of high voltage amplification by means of piezo-resonator.
(6) Many interesting phenomena are observed in the course of high voltage experiments about the resonator, such as an audlble sound production, mechanical force exerted to the resonator.
Moreover, the writer made some experiments by means of a cathode-ray oscillograph in order to observe the dynamic characteristic of the resonator. With respect to the applications of the piezo-resonator, some new ideas are given here briefly. Some remarks on the characteristics of the piezo-oscillator will be given by the writer in the following periodical and the principle of the frequency stabilization by means of the piezo-resonator was treated before and was published in the journal "Denki Hyoron" Jan. 1927View full abstractDownload PDF (1385K) -
Yasusi WATANABE1927 Volume 47 Issue 466 Pages 529-537
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe piezo-electric coupler, as the author will call it so, consists of one piezoelectric resonator and two pairs electrodes. One of them is a primary electrode and is used for the purpose of vibrating the resonator by impressing a high frequency sinusoidal voltage upon it, and another is secondary for the purpose of obtaining some potential difference across the secondary impedance connected between these electrodes.
This potential difference is induced by the reaction of the piezo-electric direct effect at the condition of the mechanical resonant vibration of the resonator.
Such a piezo-electric couplor is used in a piezo-oscillator.
In this report the author treats with the equivalent circuit for the coupler, and the mathemat cally obtained results are verified by some experiments.
_??_he experiments are made by means of the high frequency CR type potentiometer, which was devised before by the author.View full abstractDownload PDF (395K) -
T. KOMARU1927 Volume 47 Issue 466 Pages 538-563
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSWhen two synchronous generators in parallel operation, each provided with synchronizing torque of the induction machineries, are driven by the prime movers at different frequencies, or any synchronous generator, connected to net work of power transmission system, provided with synchronizing torque of the induction machineries, is in the state of slip in frequency from that of the net work, there occurs the communication of electrical energy of two distinct kinds. One is the energy communication of the induction machineries, which acts in such a manner, as to decrease the speed or frequency difference, as long as the speed or frequency difference exists. The other is the energy oscillation of the synchronous machineries, which acts in such a manner, as to flactuate the speed or frequency difference, the mean speed or frequency difference being constant.
Dr. C. P. Steinmetz has already studied the case of two alternators, or group of alternators, such as station sections, connected together, while slightly different from each other in frequency, and given many equations relating to this case. But he has neglect to accept the torque of induction machinery in his equation, and absolutely neglect the speed variation during each half cycle of the oscillating torque of synchronous machinery.
Taking the above two items into consideration, the treatments of the transient in those cases, can be introduced to the some mathematical treatments, as those of the transient of the synch onous motor, provided with induction motor torque, to be puled into synchronism with the supply of the fixed frequency. Those treatments has been introduced and studied by the many authors, as Mr. Otto Bdhm, and Mr. L.H.A. Carr. and so on.
However those authors have procecuted their treatments by the aid of the graphical solution of the fundamental differential equation, the writer has introduced the complete integrals of the fundamental differential equations, by adding the term corresponding to the damping torque, proportional to the square of the velocity. Those treatment of the differential equation is absolutely special.
Adding the terms corresponding the damping torque, proportional to the square of the velccity shall be true for the cases, such as the high speed steam turbine driven synchronous generator.
Synchronous condenser, and water wheel driven synchronous generator of large capacity, with powerful ventilating fan attached to the rotor shafts. The writer has, also discussed the speed var ation on both side of the higher speed and lower speed, which can not be neglected in some cases, as in the case of the Ljungstrom turbo-generator set, and of the small momentum synchronous motor, connected to the large capacity synchronous generator.
This paper shall be complementary to that "On the Synchronizing Torque on Ljunggtrom Turbo Generator", on which, however, the writer has discussed about the relation between the oscillating pull in torque and the induction motor torque, in the steady state. On this paper, the writer has studied and discussed the transient state of pulling in period.
The brief sketches, on the whole course of the paper is as follows;-
The writer has given the general equation of motion for both side of generator
I dω/dt+K2ω2+K1ω+K0+Bsin∫(ω-ω')dt+A(ω-ω')=K2ω0 2+K1ω0+K0
I dω/dt+K'2ω2+K1'ω'+K0'+Bsin∫(ω-ω')dt+A(ω-ω')=K2'ω0'2+K1'ω0'+K0'
From the above two equations, there followsView full abstractDownload PDF (1046K) -
[in Japanese]1927 Volume 47 Issue 466 Pages 564-569
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (440K) -
[in Japanese]1927 Volume 47 Issue 466 Pages 569-572
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (187K)
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