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

By William A. Thue

This paintings presents assurance of the layout, manufacture, install, checking out, operation and function expectancies of electric energy cables used wordwide, targeting low- and medium-voltage cables. The paintings discusses: simple dielectric thought; conductors; cable features; electric homes of insulating fabrics; defensive energy cables; sheaths, jackets and armours; criteria and requisites; splicing and terminating; ampacity; treeing; lightning security; corrosion; and extra.

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Extra resources for Electrical Power Cable Engineering: Second: Edition,

Example text

Hence the term 8 (delta) was chosen to represent the defect angle of the maierial. Figure 4-2 Cable Insulation Power Factor or Dissipation Factor Copyright © 1999 by Marcel Dekker, Inc. 1 Voltage Stress in Cables. Voltage stresses in shielded cable insulations with smooth, round conductors is defined as the electrical stress or voltage to which a unit thickness of insulation is subjected. The average stress in volts per mil is determined by dividing the voltage across the insulation by the insulation thickness in mils.

The increasing voltages are applied to the insulation with several surges at a negative potential and then, at the same voltage level, the same number of surges are applied with positive pulses. The average stress in volts per mil is calculated from the crest voltage of the surge on which breakdown occurs. 3. REVIEW OF ELECTRICAL ENGINEERING TERMS These terms apply to all electrical engineering circuits. 0 of this chapter. 1 Resistance (R) is the scalar property of an electric circuit which determines, for a given current, the rate at which electric energy is converted into heat or radiant energy.

To accommodate everyone, the IEC standard allows as much as a 20% variation in conductor area from the size designated. A comparison of the two systems can be seen in the tables in Chapter 21. Compression connectors, especially for aluminum, are sensitive to size variations. A #1/0 AWG is not close enough to any of the SI sizes so that a direct substitution is possible without changing the necessary connector and dies for either the 50 or 70 mm2 sizes. Even the 1000 kcmil (1974 mm’) size is slightly smaller than the standard SI size of 2000 mm’.

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