Download Electrical power cable engineering by William A. Thue PDF
By William A. Thue
Electricity Cable Engineering, moment version continues to be the major reference on universally used low- and medium-voltage electrical energy cables, cataloging technical features and assuring good fortune for cable manufacture, deploy, operation, and upkeep. whereas segments on electric cable insulation and box overview were made over to mirror alterations, new chapters take on designated themes just like the situation of underground system defects and the thermal resistivity of concrete, proving that this improved version lays the soundest starting place for engineering judgements.
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Extra resources for Electrical power cable engineering
Example text
The current tends to crowd toward the outer surface. This is called skin effect. A longitudinal element of the conductor near the center of the axis is surrounded by more lines of magnetic force than near the rim. This results in an increase in inductance toward the center. The decreased area of conductance causes an apparent increase in resistance. At 60 hertz, the phenomenon is negligible in copper sizes of #2 AWG and smaller and aluminum sizes #1/0 AWG and smaller. As conductor sizes increase, the effect becomes more significant.
The individual groups are made up of a number of wires rather than a single, individual strand. A ropestranded conductor is described by giving the number of groups laid together to form the rope and the number of wires in each group. Classes G and H are generally used on portable cables for mining applications. Classes I, L, and M utilize bunch stranded members assembled into a concentric arrangement. The individual wire size is the same with more wires added as necessary to provide the area. 0063 inch) individual wires.
5%. Examples of gaps in the outer layer for concentric stranded cables are shown in Table 3-3. 3° 37 10° 61 10° Shortening the length of lay on the outer layers could solve the problem but would result in higher resistance and would require more conductor material. The reason that compressed stranding is an excellent construction is that concentric stranding with its designated lay length creates a slight gap between the outer strands of such a conductor. Lower viscosity materials that are extruded over such a conductor tend to “fall in” to any gap that forms.