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

By William A. Thue

This paintings offers insurance of the layout, manufacture, deploy, trying out, operation and function expectancies of electric energy cables used wordwide, concentrating on low- and medium-voltage cables. The paintings discusses: uncomplicated dielectric conception; conductors; cable features; electric houses of insulating fabrics; defensive energy cables; sheaths, jackets and armours; criteria and requirements; splicing and terminating; ampacity; treeing; lightning safeguard; corrosion; and extra.

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Stranding and compacting also increases the temper of the metal. If a more flexible conductor is required, annealing the metal may be desirable. This can be done while the strand is being drawn or the finished conductor may be annealed by placing a reel of the finished conductor in an oven at an elevated temperature for a specified period of time. Copyright © 1999 by Marcel Dekker, Inc. 1 Copper. ASTM specifications cover three tempers for copper conductors: soft (annealed), medium-hard-drawn, and hard-drawn.

Concentric with relation to the conductor and the surface of the cable insulation. However, in actual practice this ideal situation does not exist. In actual practice, the fluface of the cable insulation is expected to be in contact with an electrical ground. This actual operating condition creates distortion in the dielectric field. The lines of electtostatic flux are crowded in the area of the insulation closest to ground. The lines of equi-potential are eccentric with respect to the conductor and the surface of the cable insulation.

_ ... 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. 4 Proximity Effect In closely spaced ac conductors, there is a tendency for the current to shift to the portion of the conductor that is away from the other conductors of that cable. This is called proximity effect. The flux linking the conductor current in one conductor is distorted by the current in a nearby conductor which in turn causes a distortion of the cross-sectional current distribution.

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