Handbook of Electric Power Calculations, Third Edition
A powerful calculations tool for electric power engineers and technicians, this book offers essential, step-by-step procedures and examples for solving a wide array of electric power problems.
TABLE OF CONTENTS Handbook of Electric Power Calculations, Third Edition
Section 9: OVERHEAD TRANSMISSION LINES AND UNDERGROUND CABLES
Richard A.Rivas [*]
Electrical Engineer, M.Sc.
Assistant Professor
Universidad Sim n Bol var
Caracas, Venezuela
Ph.D. Candidate
University of British Columbia
British Columbia, Canada
INTRODUCTION
Overhead transmission lines are composed of aluminium conductors that, even in modest capacities, are stranded in spiral fashion for flexibility. These are primarily classified as:
AAC: all-aluminum conductors
AAAC: all-aluminum alloy conductors
ACSR: aluminum conductors, steel reinforced
ACAR: aluminum conductors, alloy reinforced
Aluminum conductors are compared in conductivity with the International Annealed Copper Standard (IACS) in Table 9.1. The table lists the percent conductivity, as well as the temperature coefficient of resistance, ?, expressed per C above 20 C.
| Material | Percent conductivity | ? |
|---|---|---|
| Aluminum: | ||
| EC-H19 | 61.0 | 0.00403 |
| 5005-H19 | 53.5 | 0.00354 |
| 6201-T81 | 52.5 | 0.00347 |
| Copper: | ||
| Hard-drawn | 97.0 | 0.00381 |
[*]Original author of this section was John S. Wade, Jr., Ph.D., The Pennsylvania State University.
Copyright The McGraw-Hill Companies, Inc. 1984 under license agreement with Books24x7
