Showing papers by "Mitsubishi Electric published in 1971"
TL;DR: In this article, the electrical discharge characteristics of SF6 are discussed theoretically in relation to the field dependence of the ionization coefficient a and the electron attachment coefficient, and a simple theoretical formulation of breakdown or corona inception voltages of gaps in SF6 is derived.
Abstract: The electrical discharge characteristics of SF6 are discussed theoretically in relation to the field dependence of the ionization coefficient a and the electron attachment coefficient The results are compared with the characteristics of air. A simple theoretical formulation of breakdown or corona inception voltages of gaps in SF6 is derived. The formulation has been examined by experiments on several electrode configurations. At low pressures of less than 4 atm, the agreement of the theoretical and the experimental results is fairly good. The breakdown voltage decreases from the theoretical estimation at higher pressure.
86 citations
16 May 1971
TL;DR: In this article, the ring-loaded corrugated waveguide is shown to be very effective to the frequency broadbanding of the corrugate waveguide and the improvement of the transformer between the two waveguides.
Abstract: The ring-loaded corrugated waveguide is shown to be very effective to the frequency broadbanding of the corrugated waveguide and the improvement of the transformer between the corrugated and uncorrugated waveguides.
31 citations
TL;DR: The SF6 gas circuit breaker is getting a major position in the field of circuit breakers because of its excellent performance as mentioned in this paper, and the authors made investigations to solve the several problems encountered, such as the control of moisture content in the gas, liquefaction, control of gas leakage, selection of O-ring materials, etc.
Abstract: The SF6 gas circuit breaker is getting a major position in the field of circuit breakers because of its excellent performance. On the way to putting them to practical use the authors made investigations to solve the several problems encountered, such as the control of moisture content in the gas, liquefaction, control of gas leakage, selection of O-ring materials, etc. This paper describes the results of these investigations and presents the solutions and counter- measures applied in practice.
14 citations
TL;DR: In this paper, a magnetic spectrometer to analyze the elastically and inelastically scattered electrons in combination with the Tohoku University 300-MeV electron linear accelerator is described with emphasis on its electron ladder and the data acquisition system.
14 citations
TL;DR: The ring-loaded corrugated waveguide is shown to be very effective for frequency broadbanding of the waveguide and improvement of the transformer between the corrugate and uncorrugate waveguides as discussed by the authors.
Abstract: The ring-loaded corrugated waveguide is shown to be very effective for frequency broadbanding of the waveguide and improvement of the transformer between the corrugated and uncorrugated waveguides.
12 citations
TL;DR: In this paper, the localized vibrational modes of Be in ZnS and ZnSe were observed by using the infrared absorption and Raman scattering, and anharmonic potential constants were calculated up to the 4th order.
11 citations
TL;DR: It has been found from the computational considerations that the optimizing speed can be improved by using the trial process during the transient states of the plant, and the effect of the sampling period and the step width of control variables on the optimized speed, optimizing accuracy and stability has been studied.
9 citations
01 Apr 1971
TL;DR: In this paper, a high current arc was developed between carbon electrodes in H 2, SF 6, He, Ar, and air at an initial pressure higher than 1 atm, and the duration of the current was 250 µs.
Abstract: A high current arc was developed between carbon electrodes in H 2 , SF 6 , He, Ar, and air at an initial pressure higher than 1 atm. The current peak was above 5 kA and the duration of the current was 250 µs. The temporal and spatial changes of plasma parameters were measured by time-resolved spectrography and high-speed framing camera. The electron density of the plasma was estimated from the Stark broadening of the lines, H β , C II 4267 A, He I 4471 A, and He I 5876 A. Our observations show the following: The arc space is divided into two regions, the bright narrow core and the broad outer flame. The electron density of the core is estimated to be of the order of 1018cm-3and an electron temperature of the order of 104°K is obtained at current peak. Even after current zero, the electron density keeps the order of 1017cm-3regardless of the kind of gas.
7 citations
3 citations
01 Aug 1971
2 citations