By Klaus Ragaller

Shortly after the institution of the Brown Boveri learn middle in 1967, plans have been built to prepare a chain of Brown Boveri clinical Symposia, each one hav­ ing a special subject, to be held any other 12 months in Baden. we decide the topic for a symposium with the next necessities in brain: it's going to symbolize part of a systematic self-discipline; in different phrases it may challenge a space of scholarly learn and learn. it may be of present curiosity within the feel that vital effects have contemporary­ ly been got and substantial learn is less than \\dY within the world's clinical neighborhood. it may undergo a few relation to the clinical and technological job of the corporate. those symposia are in detail regarding one of many very uncomplicated ideas that have ruled the paintings of many sleek production businesses: shut coupling be­ tween technological know-how and engineering. it's 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 through our symposia.

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S(a), is given by positive sequence surge impedance of line zero sequence surge impedance of line. lsi pole lo clear SOURCE NETWORK I I ~--~~~----~ I ____ J CIRCUIT BREAKER Fig. S(a). Representation of 1st pole to clear a 3-phase earthed fault. A similar expression can be derived for the line surge impedance, zL 3 , for the third or last pole to open during a 3 phase earthed fault, as illustrated in Fig. S(b) and is given by For the same fault current, the relative severities of these two conditions is illustrated by the ratio of 1/9 [2/x + 5 + 2x] 37 SHORT LINE FAULT r-------.

Braun, K. H. Hinterthur, H. Lipken, B. Stein and 0. Volcker, ETZ A 97 (1976) 489 7. Y. Pelenc, Revue general d'electricite 86 (1977) 271 8. G. Catenacci, Electra 46 (1976) 39 9. A. Greenwood, 'Electrical transients in power systems', Wiley-lnterscience, New York 1971 10. E. Slamecka and W. Waterschek, 'Schaltvorgange in Hoch- und Niederspannungsnetzen', Siemens AG (1972) 11. E. Slamecka, 'Priifung von Hochspannungs- Leistungsschaltern' , Springer-Verlag, Berlin-Heidelberg-New York (1966) 12. I.

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. In the paper of G. Jones a Schlieren picture of the turbulent flow downstream is shown (Fig. 5 of G. Jones' paper). Hertz (Siemens) Do you include in your limiting-curve diagram any nozzle-clogging effects, or are these curves derived from model experiments with small arc diameters?

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