Project: T203700 #3398B-4

The primary objective of this project is to review the current knowledge of “best practices” in designing EHV overhead lines. Primary focus here will be the mechanical aspects of line design. The information should be presented to TODEM members in a way that they can understand. It is also expected that the document will provide a quick reference guide so that a less experienced engineer can understand the issues and the technical content and follow the EHV line design process in a transparent manner. Another objective of this project is to educate the younger engineers who are joining our workforce at an increasing rate. The knowledge base for EHV AC line design is getting smaller due to the dramatic changes that have occurred throughout the industry over the past 25 years and many experienced engineers leaving the profession primarily due to retirement and/or restructuring of the industry.

The main objective of Section 4 is to review the current knowledge of best practices in designing EHV overhead lines. The objective of this section is to prepare a “best practices” guide for selecting the appropriate conductor, tower and foundation configuration that will transport a fixed amount of power over a specific length.  The guide will enable selection of the optimal or appropriate configuration from single circuit, to double or multi-circuit structures as well as various insulator string configurations.  Structures are dependent on the phase configuration and bundle design.  This includes mid span clearance and clearance requirements to structural members and ground.