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12). This is done under the following basic assumptions: (1) The bundle spacing B between adjacent sub-conductors or the bundle radius R is very small compared to the height H of the phase conductor above ground. This allows the use of 2H as the distance between any subconductor of the bundle and the image of all the other (N–1) sub-conductors below ground, as shown in Fig. 9. This means that I11 = I12 = I13 = ... = I1N = 2H (2) The total current carried by the bundle is I and that of each sub-conductor is i = I/N.

4 Wake-Induced Oscillation The wake-induced oscillation is peculiar to a bundle conductor, and similar to aeolian vibration and galloping occurring principally in flat terrain with winds of steady velocity and low turbulence. The frequency of the oscillation does not exceed 3 Hz but may be of sufficient amplitude to cause clashing of adjacent sub-conductors, which are separated by about 50 cm. Wind speeds for causing wake-induced oscillation must be normally in the range 25 to 65 km/hour. 5 cm.

There are proposals to space them non-uniformly to lower the audible noise generated by the bundle conductor, but we will develop the relevant geometrical properties of an Nconductor bundle on the assumption of uniform spacing of the sub-conductors (Fig. 4). It is also reported that the flashover voltage of a long airgap is increased when a non-uniform spacing for sub-conductors is used for the phase conductor. Calculation of Line and Ground Parameters 29 1 2 N 2π N 2 N–1 N 3 4π N π R π — N B 4 R Fig.

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Basic Theory and Application of Transistors by Department of the Army


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