By Klaus Ragaller
Shortly after the institution of the Brown Boveri learn middle in 1967, plans have been constructed to arrange a chain of Brown Boveri clinical Symposia, every one hav ing a unique subject, to be held some other 12 months in Baden. we elect the topic for a symposium with the next necessities in brain: it may represent part of a systematic self-discipline; in different phrases it's going to situation a space of scholarly research and examine. it's going to be of present curiosity within the feel that vital effects have fresh ly been bought and significant learn is below \\dY within the world's medical group. it's going to undergo a few relation to the medical and technological job of the corporate. those symposia are in detail concerning one of many very uncomplicated ideas that have ruled the paintings of many glossy production businesses: shut coupling be tween technological know-how 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 by means of our symposia.
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Phys. D 7 (1974) 607 16. W. Hermann, U. Kogelschatz, L. Niemeyer, K. Ragaller and E. Schade, J. Phys. D 7 (1974) 1703 17. W. Hermann, U. Kogelschatz, L. Niemeyer, K. Ragaller and E. Schade, IEEE Trans. PAS 95 (1976) 1165 K. RAGALLER AND K. REICHERT 26 18. 19. 20. 21. 22. 23. Hermann and K. Ragaller, IEEE Trans. PAS 96 (1977) 1546 A. Pedersen, IEEE Trans. PAS 89 (1970) 2043 W. Boeck, Bull. SEV 66 (1975) 1234 U. Kogelschatz, E. Schade and K. D. Schmidt, Brown Boveri Review 61 (1974) 488 B. Eliasson and E.
The highest currents occur when you have line contributions, and then you get an exponential-shape trv as described, for example, by ANSI and considered in IEC. Third, your statement that the peak voltage does not depend on the short-circuit current is not exactly right. The peak voltage is higher for so-called percent current faults. K. Ragaller Your first remark refers to an often-discussed question: Can one simplify things so highly and discuss only two types of fault? As you said, there is a large number of requirements on circuit breakers besides these two: interruption of small inductive currents, capacitive currents, and many more.
Because of the relatively steep slope of the thermal limiting curve in Fig. 16 the current limit is displaced less than proportionally when increasing the number of chambers. INTRODUCTION AND SURVEY 25 This diagram contains in a very condensed form the physical and network aspects of current interruption. Many problems of the design and application of circuit breakers can be discussed with the aid of this diagram. We mention here only two examples: If a circuit breaker is operated close to one of the limiting curves, what can be done to extend the current range?