By Klaus Ragaller

Shortly after the institution of the Brown Boveri learn heart in 1967, plans have been built to arrange a chain of Brown Boveri medical Symposia, every one hav­ ing a unique subject, to be held another 12 months in Baden. we elect the topic for a symposium with the next standards in brain: it may signify part of a systematic self-discipline; in different phrases it's going to drawback a space of scholarly research and examine. it may be of present curiosity within the feel that vital effects have fresh­ ly been bought and enormous study is lower than \\dY within the world's clinical group. it may endure a few relation to the clinical and technological job of the corporate. those symposia are in detail relating to one of many very uncomplicated thoughts that have ruled the paintings of many smooth production businesses: shut coupling be­ tween technology and engineering. it truly is to this coupling that we owe the technical stan­ dard of our items, and it's this coupling which we are hoping to be furthered by means of our symposia.

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RAGALLER AND K. REICHERT K. Ragaller The picture in Fig. 11 was taken for the fairly high current of 2 kA. It is very difficult to detect turbulence in the region between the nozzles because the flow velocity is very small there. What I wanted to show is that the turbulence develops as a result of instability of the free-shear layer in the arc boundary. The important thing is that downstream of the nozzle throat this effect becomes one of extreme intensity because of the high velocity difference between the hot and cold gas.

19. The point of intersection of the two curves yields a current limit, determined in this case by the dielectric mode. Log Uc t I 5 I 10 I 1/kA--.. 50 I 100 Fig. 19. Limiting curve for the dielectric interruption mode. The thin line indicates the network behavior. The point of intersection gives the dielectric current limit. 5. Diagram for Circuit-Breaker Application in the Network Basically, the two limiting-curve diagrams described in previous sections define the area of application for a specific breaker chamber in a high-voltage network.

J. Lowke (University of Sydney) Your dielectric limiting curve is independent of the current at low currents and falls off at higher currents. Could you comment on the physical significance of these two sections? e. there is no hot gas t·emaining in this case? K. Ragaller The curve will be discussed in more detail in the paper of J. Kopainsky. Unfortunately there are very few measured curves available. One quantitative measurement of such a curve was made at Siemens (see discussion of Kopainsky's paper).

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