Tuesday, May 1, 2018

Design of Electrical Transmission Lines Structures and Foundations By Sriram Kalaga and Prasad Yenumula

Design of Electrical Transmission Lines Structures and Foundations By Sriram Kalaga and Prasad Yenumula
Contents : 
1 Introduction
2 General design criteria
3 Structural analysis and design
4 Foundation design
5 Design deliverables
6 Advanced topics
Preface : 
Electrical power is now an indispensable requirement for the comfort, safety and welfare of mankind in the 21st century. No matter what the source of power generation is, its final destination is the abode of the individual consumer – a person, industry, machine or organization. This book deals with the how, what and where the many engineering disciplines collaborate to make that journey happen. The design of overhead electrical transmission lines is a unique activity which involves direct or indirect contributions of many other disciplines, both engineering and others. The word “electrical’’ just implies that the main focus is transmittal of electrical power or energy from one point to another. But that movement of power also requires conductors, insulators, supporting structures (or pylons), connecting hardware, good anchorage into ground while satisfying myriad technical rules, governmental regulations and guidelines aimed at safety and reliability. This calls for the involvement of civil engineers (structural and geotechnical), electrical engineers, surveyors (analog and digital), drafters (CAD) and finally construction contractors who build what we design. Since transmission lines often begin and end at substations, specialists in substation design and protection and control are also involved. In most areas of the world, the term “transmission structures’’ usually means steel
lattice towers. In the West, they however encompass a bewildering range of structural systems and configurations, materials, hardware and construction practices. The industry now employs steel (both tubular as well as lattice), prestressed concrete, wood (natural and laminated) and composites as primary materials. Polymer insulators often replace traditional porcelain and glass units; high temperature low sag (HTLS) and vibration-resistant conductors with superior sag-tension characteristics are available for longer spans. Fiber optic ground wires now serve a dual purpose: shielding against lightning strikes as well as communication. The advent of powerful digital computers enabled modeling and analysis of not only individual structures comprising a transmission line but also the entire line in one session.
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