By Klaus Ragaller
Shortly after the institution of the Brown Boveri study heart in 1967, plans have been built to prepare a sequence of Brown Boveri medical Symposia, each one hav ing a unique subject, to be held some other 12 months in Baden. we decide the topic for a symposium with the next requisites in brain: it's going to symbolize part of a systematic self-discipline; in different phrases it may obstacle a space of scholarly learn and examine. it may be of present curiosity within the experience that vital effects have fresh ly been got and significant learn is below \\dY within the world's medical group. it's going to endure a few relation to the clinical and technological task of the corporate. those symposia are in detail concerning one of many very easy ideas that have ruled the paintings of many glossy production businesses: shut coupling be tween technology and engineering. it really is to this coupling that we owe the technical stan dard of our items, and it really is this coupling which we are hoping to be furthered via our symposia.
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Lower portion: Differential interferogram showing the arc and the thermal a rc boundary layer at a current of 2 kA in nitrogen . INTRODUCTION AND SURVEY 13 the arc between the nozzles. The arc boundar·y, with its steep temperature gradient, can be observed from the kink in the interference fringes. An almost rectangular temperature profile with a temperature at the axis of about 20,000 K is created as a result of the very strong energy transport by radiation within the arc. Due to the low density of the gas at this temperature, the plasma is strongly accelerated by the axial pressure gradient: in the throat, the axial plasma velocity is 6,000 m/s.
18 a streak recording of a dielectric failure is shown . After a few after until seen be can pattern luminous thermal extinction of the arc, no previous the in occurs n 100 IJS around the peak recovery voltage when a breakdow visible as a result arc channel. The breakdow n is initiated by a spark which is made of a momentar y overexpo sure. Fig. 18. Streak record of a dielectri c failure in an SF6 -circuit breaker. on mode Compared with the thermal mode, the effects for the dielectric interrupti f ields , pressure and flow the to addition In are obviously more numerou s and varied.
Slamecka, 'Priifung von Hochspannungs- Leistungsschaltern' , Springer-Verlag, Berlin-Heidelberg-New York (1966) 12. I. Drganc, K. Muller, S. Shaikh and G. A. Gertsch, Brown Boveri Review 61 (1974) 64 13. C. H. Flurscheim, lEE Monograph Series 17, 'Power circuit breaker theory and design', Peter Peregrinus Ltd. 1975 14. C. J. 0. Garrard, Proc. lEE 123 (1976) 1053 15. W. Hermann, U. Kogelschatz, K. Ragaller and E. Schade, J. Phys. D 7 (1974) 607 16. W. Hermann, U. Kogelschatz, L. Niemeyer, K. Ragaller and E.
Current Interruption in High-Voltage Networks by Klaus Ragaller