Chapter 10

Transmission Line Structures

10.1 Traditional Line Design Practice 10-1

Structure Types in Use • Factors Affecting Structure Type Selection

10.2 Current Deterministic Design Practice 10-5

Reliability Level • Security Level

10.3 Improved Design Approaches 10-9

10.A Appendix A: General Design Criteria—Methodology 10-9


Joe C. Pohlman


An overhead transmission line (OHTL) is a very complex, continuous, electrical/mechanical system. Its function is to transport power safely from the circuit breaker on one end to the circuit breaker on the other. It is physically composed of many individual components made up of different materials having a wide variety of mechanical properties, such as

  • Flexible vs. rigid
  • Ductile ...

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