Electrical Power Cable Engineering (Power Engineering) by Leonard L. Grigsby
By Leonard L. Grigsby
Offers updated assurance of the layout, manufacture, deploy, trying out, operation, and function expectancies of electrical energy cables used worldwide—focusing on low- and medium-voltage cables. Discusses easy dielectric conception; conductors; cable features; electric homes of insulating fabrics; defensive strength cables; sheaths, jackets, and armors; criteria and necessities; splicing and terminating; ampacity; treeing; lightning defense; corrosion; and extra. features a thesaurus of phrases and crucial tables and information.
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2 Basic Components of a Shielded Power Cable The essential additional component is shielding. However, where is it placed, what materials are used, and what does it do to the dielectric field? Let us start from the conductor again and move outward fiom the center of the cable. 1 Conductor. Nothing unusual as compared to a non-shielded cable. 2 Conductor Shield. A conducting material is placed over the conductor circumference to screen (shield) out irregularities of the conductor contours. The dielectric field will not be af5ected or “see” the shape of the outer strands 23 (or other conductor contours) due to the presence of the conductor shield (screen).
17 Figure 2-3 Electric Field Lines Bend to Terminate at Ground Plane Surface of Covering . : . : I i .. i t Ground In Figure 2-3, we see considerable bending of the electric field lines. Recognizing that equipotential lines are perpendicular to the field lines, the bending results in potential difference on the covering surface. At low voltages, the effect is negligible. As the voltage increases, the point is reached where the potential gradients are s a c i e n t to cause current to flow across the surface of the covering.
The ICEA minimum requirements of IR (sometimes referred to as ”guaranteed values”) are shown as well to represent values that may be measured in the field. The actual value of IR that would be read in a laboratory environment are many times higher than these “minimum” values and approaches the “typical” values shown below. 45 Table 4-1 Insulation Resistance Insulation ICEA Minimum IHMWPE I XLPE & EPR, 600 V XLPE & EPR, Med. 2 Surface Resistivity. ’’ These terminations or ends, when voltage is applied to the conductor, can have current flow over the surface of that material.