Electrical Power Cable Engineering: Second: Edition, by William A. Thue

By William A. Thue

This paintings presents assurance of the layout, manufacture, set up, checking out, operation and function expectancies of electric energy cables used wordwide, concentrating on low- and medium-voltage cables. The paintings discusses: easy dielectric conception; conductors; cable features; electric homes of insulating fabrics; defensive strength cables; sheaths, jackets and armours; criteria and requirements; splicing and terminating; ampacity; treeing; lightning safety; corrosion; and extra.

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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 negli- Copyright © 1999 by Marcel Dekker, Inc. ~_ ... gible 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.

It is generally assumed that the current is evenly divided among the strands and does not transfer from one strand to the next one. For that reason, the dc resistance is based on: Multiply the number of strands by the cross-sectional area taken perpendicular to the axis of that strand. The product is then the cross-sectional area of the conductor. Compare the length of each strand to the axial length of the 0 conductor. This increased length is arithmetically averaged. Copyright © 1999 by Marcel Dekker, Inc.

Copyright © 1999 by Marcel Dekker, Inc. 13) 2 = Conductor impedance in ohms per 1000feet R , = ac resistance in ohms per lo00 feet XL = Conductor reactance in ohms per 1000 feet Conductor impedance becomes an important factor when calculating voltage drop. Since the power factor angle of the load and impedance angle are usually different, the voltage drop calculation can be cumbersome. 9 Total Cable Reactance The total cable reactance (X) is the vector sum of the capacitive reactance and the inductive reactance of the cable in ohms per foot.

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