By William A. Thue
Presents updated assurance of the layout, manufacture, install, checking out, operation, and function expectancies of electrical strength cables used worldwide—focusing on low- and medium-voltage cables. Discusses simple dielectric idea; conductors; cable features; electric homes of insulating fabrics; defensive energy cables; sheaths, jackets, and armors; criteria and necessities; splicing and terminating; ampacity; treeing; lightning defense; corrosion; and extra. includes a word list of phrases and crucial tables and knowledge.
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Extra resources for Electrical Power Cable Engineering
A great deal of charge can be contained in this capacitor. This charging current must be controlled so that a path to ground is not established along the surface of the semiconducting layer. This path can lead to burning and ultimate failure of that layer. Accidental human contact would be a very serious alternative. It is clearly necessary to provide a continuous contact with ground that provides an adequate path to drain the capacitive charging current to ground without damage to the cable. This is done by adding a metallic path in contact with the semiconductingshield.
Landinger, adapted from class notes for “Power Cable Engineering Clinic,” University of Wisconsin -- Madison, 1997. [3-31 “Committee Report on AC/DC Ratios at 60 Cycles,” IPCEA Project 359, June 1958, reprinted 1973. [3-41 “Engineering Data for Copper and Aluminum Conductor Electrical Cables,” The Okonite Company, Bulletin EHB-90, 1990. [3-51 Southwire Company Power Cable Manual, Second Edition, 1997. [3-61 American Society for Testing and Materials, Annual Book of ASTM Standards. Vol. 03 : Electrical Conductors.
At first, it might be thought that the solution is to continue to add insulating covering thickness as the operating voltage increases. Cost and complicaticms involved in overcoming this difliculty would make this a desirable first choice. Unfortunately, surface erosion and personnel hazards are not linear fbnctions of voltage versus thickness and this approach becomes impractical. 1 The Insulation Shield In order to make permanent ground contact possible, a semiconducting or resistive layer may be place over the insulation surface.