The Journal of the Institute of Electrical Engineers of Japan

Corona Voltmeter

N. INOUYE

1922 Volume 42 Issue 403 Pages 83-98
Published: 1922
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.42.83

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The engineering world has come to demand some means of measuring the extra-high voltages accurately and instantaneously and the corona voltmeter is one of the instruments that is gaining favor. The theory and constructional features as given in this paper brings to light some interesting and important points.
In the corona voltmeter, instead of using the sphere gap for voltage is measured by the corona on a rod of known diameter and under known condition of the surrounding media. However, the difficulty of detecting the f rmation of corna has been the drawback in the use of this instrument.
Generally speaking, there are three ways of detecting the corona formation, namely, (1) by vision (2) by the peculiar sound emitted and (3) by the discharge into the atmos. phere. To detect corona by sight is not very accurate and the author under the direction of Dr. J. B. Whiteheak carried out a series of experiments in the research laboratory of the Johns Hopkins University utilizing the second and the third means mentioned above. Sound amplifier and corona discharge current amplifier were the two instruments developed in the course of the experiments. Both of these use the vacuum bulb.
The latter part of the paper is taken up in the comparative study of the accuracy of the sphere gap and the cprona voltmeter.

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On the Grounding Reactor

SADATOSHI BEKKU

1922 Volume 42 Issue 403 Pages 99-113
Published: 1922
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.42.99

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With the increase in number of the high voltage power transmission systems, the subject of inductive interference to telephone and telegraphic circuits has become one of the most im-portant topic of study among the transmission and communication engineers. In connection therewith, various means of limiting the ground current have been devised and in Germany, the use of grounding reactor is being considered with more or less favor. It is the author's belief that the study of grounding reactor is paramount in Japan in view of the regulation of the government with regard to grourding. With the use of reactors it will become nec-essary to investigate into the problem of protective relays. In the appendix, the theory of Petersen coil and quench transformer is presented and later proves the same effect is obta-ined by using two reactors as with the use of quench transformer.
The paper is presented under the following topics:-
1. Introduction.
2. Grounding of one phase of a non-grounded three phase transmission circuit.
3. Grounding of neutral throngh a reactor.
4. Grounding of three phases through three phase reactor.
5. Effects of inductive interference on communication circuits.
6. Conclusion.
7. Appendix.
(A) Petersen's reactor calculation (B) Quench transformer conclusion.

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Theory of Distortionless Alternator

G. SHIMIDZU

1922 Volume 42 Issue 403 Pages 114-170
Published: 1922
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.42.114

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In September of 1918, at the kwansai sectional meeting of the Institute of Electrical. Engineers of Japan, the author presented a paper entitled "Armature reaction and voltage wave form of a single phase generator" and great deal of data was given out on distortionless alternators and other alternators with laminated cylindrical field magnets. The present paper may be considered a presentation of the results of further research conducted by the author on the latter phase.
In working out the theoretical exposition of the fundamental equations of non-transient phenomena of distortionless A. C. generator with two field magnets, it has become evident that the conclusion arrived at in the previous paper was confirmed by the result of the later inv-estigation. The author derives formulae, for calculation short circuit current and voltage regulation of distortionless alternator starting from the fundamental equations. A point is brought to our attention that the construction of a distortionless alternator with one field magnet is simpler than with two.
By the proper interpretation of the fundamental equations, a solution of instantaneous current resulting from the load variation may be gotten. The instantaneous short circuit current and its wave form can be obtained by the further elaboration of these equations. Without going through the intermediate steps and introducing the load variation function, the short circuit current can be obtained direct. In case one phase of a three phase or two phase distortionless alternator should be short circuited, the voltage in other phase or phases can be obtained.
It is very interesting to note that the non-transient current of a distortionless alternator with two field magnets is similar to that of a transformer. Also the coefficient 6 which equals 1-1/vVf (where v and Vf are coefficients of magnetic flux leakage of armature and field pieces respectively) which so often met in the treatise of induction motors and transformers is also applicable to alternators.

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