Download Kaiser Aluminum Electrical Bus Conductors Technical Manual by Kaiser Aluminum PDF

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Once the GMD or equivalent spacing has been detennined, the inductive reactance due to this spacing may be determined from convenient tables of inductive reactance spacing factors which list values of inductive reactance corresponding to various spacings or equivalent spacings (GMD) as determined by the above formulas. Inductive Reactance of Rectangular Bars Af\. 123 A = A=B=C Ii ,. 26 A = Fig. 16 30 Graphical Solution Using Reactance Curves-The inductive reactance of rectangular bars usually cannot be calculated by the methods used for round conductors.

13 microhms per foot at 70 C. 91 INDUCTIVE REACTANCE OF BUS CONDUCTORS The total inductive reactance, then, is the algebraic sum of these two parts: The inductive reactance for various bus conductor shapes is obtained by different means. For solid round and round tubular bus, established formulas for inductive reactance may be used or reactance values may be obtained from tables for the standard sizes. For rectangular bus bars and for channel bus arranged in box form, the most convenient method of determining 60 cps inductive reactance is from curves giving reactance in terms of conductor spacing or equivalent spacing.

These curves are typical for all diameters of tubing having a conductivity of 53 per cent (lACS at 20 C). 8 inch wall thickness for all diameters. Other materials will produce similar characteristics, but these optimum. characteristics will occur at a different wall thickness. 7 inch wall thickness. The effect of high conductivity of the material is to concentrate the current nearer the surface of the conductor. This means that a lower conductivity material fares better, with regard to skin effect; a given cross section is better utilized with current more uniformly distributed.

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