Reconductoring and Voltage Upgrading of Transmission Lines


Power transmission owners and operators need to develop new line designs and to find ways of increasing the capacity of existing lines that are acceptable to the public, reliable, and which re-quire only modest capital investment. Long lead times for new lines, limited availability of right-of-way, and increasingly complex procedures for applications and permits justify increased sophistication in making lines that are more compact yet capable of higher power flow levels.


This course addresses traditional and novel methods and materials for maximizing power flow on new and existing transmission lines. It explores the tradeoffs between reducing visual impact and operational reliability, between capital investment and increased power flow. Both electrical and mechanical aspects of line design and modification are covered within a framework of making smart economic choices. Both experienced designers and beginning engineers can profit from the presentations. Some topics related to underground cables are included.

Expected Learning Objectives / Outcomes

PDC has identified learning objectives we expect each student to obtain on completion of this course.  The student completing this course should be able to:
  1. Identify the main components of an overhead power transmission line.
  2. List and briefly describe the power system constraints that may apply to a transmission line.
  3. Describe in general terms the relationships between sag, tension, line loading and operating temperature.
  4. List the basic environmental issues associated with transmission lines.
  5. Understand the basic requirements for overhead line ratings.


The course will be valuable to engineers responsible for planning, operating or designing transmission circuits.


An engineering degree in mechanical, electrical or civil engineering is desirable.

Course Outline