By Klaus Ragaller
Shortly after the institution of the Brown Boveri study heart in 1967, plans have been built to arrange a sequence of Brown Boveri clinical Symposia, each one hav ing a special subject, to be held any other yr in Baden. we elect the topic for a symposium with the subsequent requisites in brain: it may represent part of a systematic self-discipline; in different phrases it's going to problem a space of scholarly research and examine. it's going to be of present curiosity within the experience that vital effects have fresh ly been acquired and substantial examine is below \\dY within the world's clinical group. it's going to undergo a few relation to the clinical and technological task of the corporate. those symposia are in detail concerning one of many very uncomplicated recommendations that have ruled the paintings of many sleek production businesses: shut coupling be tween technology 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 by way of our symposia.
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Extra info for Current Interruption in High-Voltage Networks
5, the last pole to clear a 3 phase earthed fault is seen to be 1. 02 to 1. 1 times the severity of the first pole to clear. 3. e. M. B. HUMPHRIES 38 where L 1 , L 0 , tances. c1 and c0 are the positive and zero sequence inductances and capaci- Considering, for the moment, a single circuit line, the sequence inductance, L 1 and L 0 can be derived from the expressions where L 11 , L 22 , L 33 self-inductances of the three phases mutual inductances between the three phases. L12' L13' L23 and These self and mutual inductances at the required frequencies can be calculated from knowledge of the conductor construction, bundle spacing and spatial disposition on the tower.
The arc is shown on the left- hand side of the photograph. After extinction, the thermal arc boundary layer is made visible as a black zone by means of a special Schlieren technique. The relatively slow contraction of this zone due to convection is clearly evident: even after 500 ms a hot channel is still seen along the axis. 2 1 This hot channel connects the two electrodes, as the arc did previously, and results in a reduction of the breakdown voltage compared with a purely cold as flow. Because of the elevated temperature, the density is decreased and, as already mentioned, the coefficients a and f'J in equation (11) are density dependent.
These differences are caused by the changing influence of the ground plane between the two conditions. For this high river crossing the bottom conductor has the highest surge impedance of the three which is the reverse of that for a normal tower. 42 M. B. 4. Effect of Earth Resistivity For the same standard 4 x 400 mm 2 ACSR 400 kV line, the surge impedance varies according to Table 6 below with different values of earth resistivity. The values show that surge impedance varies by 5. 7 % at 1 kHz and 3.
Current Interruption in High-Voltage Networks by Klaus Ragaller