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, each one hav ing a unique subject, to be held another yr in Baden. we decide the topic for a symposium with the subsequent necessities in brain: it may signify part of a systematic self-discipline; in different phrases it's going to quandary a space of scholarly research and examine. it may be of present curiosity within the experience that vital effects have fresh ly been got and massive learn is below \\dY within the world's clinical group. it's going to undergo a few relation to the medical and technological task of the corporate. those symposia are in detail relating to one of many very easy recommendations that have ruled the paintings of many smooth 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 truly is this coupling which we are hoping to be furthered through our symposia.
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Extra info for Current Interruption in High-Voltage Networks
Although not very apparent, the rate of rise of the line oscillation is higher for the shorter line lengths due to the higher interrupted fault currents, although the lower surge impedances reduce this effect. These slf transients have been combined with a source trv envelope in Fig. 4 to show the overall effect of different short-line faults. In this illustration the same basic source trv is used for all the slf conditions and modified according to IEC 56-2. From Fig. 4 it can readily be seen that the higher rate of rise of trv occurs with the shorter line lengths to the fault location although the initial voltage peaks are lower.
From Table 1 the first and last pole to clear surge impedances ZL 1 and zL 3 are calculated to be 299 and 322 ohms respectively. 39 SHORT LINE FAULT The equivalent surge impedances from the modal analysis for the same line conditions lie between the 1st/4th pole impedances and the 3rd/6th pole impedances respectively. Thus it can be seen that the single value of surge impedance derived from the sequence parameters represents an average value for the line. For some particular studies the average value may be insufficient if the conductor location on a tower is considered to be significant.
Possible effects of the behavior of arc roots on the interruption process will be discussed in the paper by Mentel. 2. Important Arc Characteristics Before describing the extinction 16 process, we summarize some experimental results 15 ' for an arc in the configuration shown in Fig. 10. Two arc segments must be dis- tinguished . In the area between the two nozzle throats there exists an approximately parabolic (see Fig. 10) axial pressure distribution, which results in a cylindrical arc (dT /dz = 0).