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Volume 48, Issue 480
Displaying 1-7 of 7 articles from this issue
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Takeo SHIMIZU1928 Volume 48 Issue 480 Pages 691-699
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSA semi-popular lecture was delivered on March 14, 1928, as a sequence of lectures given annually in commemoration of the late Prof. Hatsune Nakano, K. H. of the Faculty of Engineering, Tokyo Imperial University. The lecture relates to the history and the recent advancement of our conception about electrons. The parallelism between the wave optics and the new wave mechanics was followed rather closely.View full abstractDownload PDF (702K) -
Matsujiro ÔYAMA, Mineo WAKAI1928 Volume 48 Issue 480 Pages 700-703
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn the present paper, the authors give the description of a thermo-electric pyrheliometer which utilizes the function of the modified Oyama-type thermoradiometer(1) enclosed in an evacuated glass tube as shown in Fig. 1.
It is far superior to other-type pyrheliometers which have the following defects:(1) they are either too sensitive or too sluggish; (2) they must be provided with a special mechanism, heliostatic control, which enables them to follow the revolution of the Sun; (3) and they are not weather-proof.
The sensibility of our instrument is 0, 213 volt/watt per sq. cm, and time constant is 0.34 sec. Examples of record are given in Figs. 4 and 5. Fig. 5 shows an example recorded on a cloudy day. In Fig. 4, it is clearly indicated that about 0.07 watt per sq. cm of energy reaches the earth from the Sun at noon.
A thread recorder of Cambridge Instrument Co. was used in recording.View full abstractDownload PDF (637K) -
S. BEKKU, M. URUSHIBATA1928 Volume 48 Issue 480 Pages 704-705
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn the previous paper, one of the present authors showed that the transient impedanco of an alternator just after the occurrence of short-circuit is equal to the negative phase sequence impedance in the sustained state. In the present paper this proposition is verified theoretically for an ideal alternator of zero resistance. The neglection of resistance is equivalent to admit the constant linkage theorem. Therefore the constant linkage theorem must infer the equality of the negative phase sequence impedance and the transient impedance just after the occurrence of short-circuit.
Further the transient reactance is showed to be approximately equal to the sum of armature leakage reactance and the field leakage reactance reduced to the armature winding, which fact has been generally appreciated by designers.View full abstractDownload PDF (106K) -
Y. KATO1928 Volume 48 Issue 480 Pages 706-711
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe calculated results on the directivities of the "Saw Teeth" antenna are given in this paper.View full abstractDownload PDF (239K) -
II. On the Sources of Atmospherics Received in JapanJûichi OBATA1928 Volume 48 Issue 480 Pages 712-721
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDirectional observations of the radio-atmospheric disturbance were commenced in July 1926. A preliminary account on the apparent direction of arrival of atmospherics at Tôkyô has been published in this Journal in April 1927. The observations are thenceforth being continued and from the results so far obtained, the following conclusions may be arrived at relating to the sources of atmospherics in Japan, with special reference to their relation with the meteorological environment.
(1) The apparent direction of arrival of most clicks is often very definite and can easily be determined; still in no less cases the direction is almost indefinite, i. e. almost equal number of atmospherics arrives from every direction.
(2) It is also often the case, especially in summer and autumn when the atmospherics are most prevalent, that there are more than one direction, at which the number of atmospherics shows a maximum.
(3) A permanent source of atmospherics seems to exist at the bearing 300°to 330° from Tôkyô; in all seasons except winter many atmospherics seem to arrive from these directions.
(4) Besides this permanent one, sources of atmospherics are produced in and in the vicinity of Japan, according to the meteorogical environment. Several examples are given, showing thunderstorms and lines of discontinuity as the sources of disturbances.
(5) There are still evidences to show that many atmospherics come from the S-W direction, presumably from the troplcs. These disturbances can easily be distinguished from the short-range ones, when in winter the latter are stamped out.
Full details will shortly be published in English in the Report of the Aeronautical Research Institute, Tôkyô Imperial University.View full abstractDownload PDF (1041K) -
Kenji KATO1928 Volume 48 Issue 480 Pages 722-739
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAt the end of 1927, the Nihon Electric Power Company has completed the erection of its Tokyo Transmission Line, deemed to transmit the power developed at River Kurobe, toward Tokyo and. Yokohama. This line is of 154, 000 volts and 301.3 kilometres in length, one of the longest lines of the same class. The author, together with a few comrades, went to Yanagawara Power Station for the inspection and tests of the same line as well as the station. After routine tests having been finished, the following special tests were carried out:-
(1) Charging of each line against the earth.
(2) Measurement of the induced voltage in a neighbouring public telephone line, and also in the company's communication line.
(3) Measurements of line-to-earth impedances and admittances, line-to-line impedances and admittances.
(4) Charging various lengths of the line at three-phase normal tension.
As comparing the test results with those obtained by calculation bassd on the well-known theories and formulae, it is generally acceptable that the lineto-earth reactance of one conductor is approximately 0.75 ohm per kilometre at 60 cycle in spite of the diameter and clearance of the conductor, and that otherwise the test results meet fairly well with the calculation.
Making use of the observed data as much as possible, the author then tried the calculation to find the grounding current in case of one-line fault on any part of the line, for five different systems of neutral grounding. (i. e:-600ω-∞, 600ω-600ω, 0-0, ∞-0, 0-∞: here the figures represent the ohmage of the grounding resistors at generating station and at substation respectively.) Comparing these cases, he may conclude that the double dead-grounding (0-0) is most favourable for this line, taking both the inductive interference and protective-relay operation into consideration. However the "stability" of the transmission as affected by these modes of grounding is here entirely out of the question.
The conten's of this paper are as follows:-
1. A brief description of the Tokyo Transmission System.
2. Kinds of tests made.
3. Pressure test.
4. Measurements of induced voltage in communication lines.
5. Determination of various line constants.
6. Line charging test.
7. Maximum power transmitted by this line.
8. Calculation of grounding currents in case of one line fault.View full abstractDownload PDF (1294K) -
On the Characteristics of and Tests on the Tokyo Line of the Nihon Electric Power Company. (Part II)On the test data at Yanagawara Power Station and the characteristics of the synchronous machine connected to the long distance transmission lineM. TAKAHASHI1928 Volume 48 Issue 480 Pages 740-757
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn this paper, among the miscellaneous tests on the Tokyo Line of the Nihon Electric Power Company, which were carried out at Yanagawara Power Station in January 1928, the characteristic tests of generators themselves and line charging characteristics are described, and also the behaviour of synchronous machines connected to the long distance transmission line is discussed. Three 20, 000 kVA generators at this station are designed to operate at two cycles by changing their armature winding connections, namely normal straight star at 50 cycles and inter-connected star at 60 cycles. The general characteristics of alternators having such windings are considered and the efficiency, positive phase-sequence impedance, negative phase-sequence impedance, leakage reactance and armature reaction are discussed at each connection. The positive phase-sequence impedance may be represented in the form
Z=2(Z1+Z1') for straight star connection
Z'=2Z1+Z1' for inter-connected star connection
where Z1 is the positive phase-sequence impedance of one group winding (see Fig. 5) and Z1' the mutual impedance between two winding groups, and can be determined from experiments. We obtained from test data Z'=80-89% of Z1 and Z1' may be considered as 40-70% of Z1.
Next, three-phase line charging tests are described. The generator characteristics excited by zero p. f. armature leading current are obtaind by the graphical method and compared with the actual test data. Favourable coincidence is ascertained. Switch-in transient phenomena of the generator on the no-load transmission lin are discussed and their nature is examined from the oscillogram actually obtained.
The voltage built-up time of the generator is calculated by the author's method (the details of which may be described in later report) and satisfac- tory agreement with actual oscillographic data is obtained.
Next, single-phase line charging tests or the pressure test of transmission line and the behaviour of the generator are discussed. The generator char-acteristics are considered for two cases of transformer connections (see Fig. 11) and the solution at each case is obtained by two methods-one, by the Method of Symmetrical Co-ordinates; the other, by ordinary graphical method. In view of the generator stability on such a single-phase condensive load, the transformer connection B in Fig. 15 is preferable.
The general nature of synchronous machines for transmission line stability is discussed and the significance of short-circuit ratio and the quick-response excitation system are described. Numerical examples of short-circuit ratio for-large machines in Japan are mentioned.
This paper consists of the following articles:
(i) General description of the Yanagawara Power Station.
(ii) Characteristics of the generator to be used at 50 and 60 cycles.
(a) Positive phase-sequence impedance
(b) Negative phase-sequence impedance
(c) Leakage reactance
(d) Armature reaction
(iii) Transmission line charging tests.
(a) Results of the experiments
(b) Transient phenomena of the generator suddenly connected to the no-load transmission line
(iv) Pressure test for the transmission line and the charactristics of the generator.
(a) By the Method of Symmetrical Co-ordinates
(b) By the graphical method
(v) Generator characteristics regarding to the transmission line stability.
(a) Short circuit ratio
(b) Quick-response excitationView full abstractDownload PDF (1195K)
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