By Klaus Ragaller

Shortly after the institution of the Brown Boveri study middle in 1967, plans have been constructed to prepare a chain of Brown Boveri medical Symposia, every 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 necessities in brain: it's going to symbolize part of a systematic self-discipline; in different phrases it may main issue a space of scholarly learn and learn. it may be of present curiosity within the experience that very important effects have contemporary ly been got and significant study is lower than \\dY within the world's clinical neighborhood. it's going to endure 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 smooth 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's this coupling which we are hoping to be furthered by way of our symposia.

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At subsequent towers along the line, the ground and aerial mode travelling waves arrive almost simultaneously and hence the current through their footing resistances will be very small. Thus for the short lengths of line considered here, the division of the travelling wave between the earth and earth wire will be detennined largely by the sending end tower footing resistance. The variation in surge impedance with sending end tower footing resistance is illustrated in Table 7 below, assuming that other tower footing resistances are zero and the earth resistivity is constant at 20 ohm metres.

RAGALLER AND K. REICHERT the case of SF 6 at a pressure of 14 bar. 18 In the area below the curve, current interruption takes place and above it so-called thermal failure. du dt kV fLS 5 10 Fig. 16. Thermal mode limiting curve for SF 6 at 14 bar (thick line). Dependence of du/dt on current according to equation (4) (thin line). Point of intersection gives thermal current limit. Since, as shown above, the time constant correlating the plasma region to the equilibrium value of a specific current is extremely small, the plasma region controlling thermal breaking is not influenced by the current variation of the high-current phase.

However the line surge impedance increases slightly as the natural frequency of the faulted section of line decreases, as implied from Table 1. At the same time, the time to peak of the line side oscillation, tL, increases. 848 1. 0080 IJF/km z1 Positive Sequence Surge Impedance z0 Zero Sequence Surge Impedance The overall effect of varying the length of the faulted short line is illustrated in Fig. 3 which shows the line side oscillation for different line lengths. No account has been taken of terminal capacitance or other modifying factors apart from a certain degree of damping after the first peak.