Working on Deenergized Transmission Lines
COURSE DESCRIPTION
Transmission lines have characteristics that make them different from distribution lines. Because of the high voltages associated with transmission lines and the increasing use of multiple transmission lines on a given right-of-way, or even on individual structures, lineworkers who work on deenergized transmission lines need to be aware of some special considerations.
COURSE GOAL
This training program focuses on how to safely de-energize and isolate a transmission line. Specific attention is paid to how a de-energized transmission line can be made safe to work on, and how a transmission line can be safely restored to service.
SUBJECTS AND OBJECTIVES
De-Energizing, Isolating, and Tagging
Describe the general procedures for de-energizing, isolating, and tagging a transmission line.
Induced Charges
Describe how a de-energized line can become energized by magnetic induction.
Describe how a de-energized line can become energized by electric induction.
Static Charges and Ground Systems
Describe how a de-energized line can become energized by static electricity.
Describe three transmission grounding systems.
Describe how grounding minimized the dangers of induced and static charges.
Describe how charges may continue to be present on a line at locations other than the point of grounding.
Field Clearance and Testing
Describe the general procedures for obtaining a clearance on a transmission line.
Describe how to test a transmission line to determine that it is de-energized.
Grounding
Explain why it is necessary to ground a de-energized transmission line.
Describe how to safely ground a transmission line.
Returning a Line to Normal
Describe how to safely remove grounds from a transmission line
Describe the general procedure for releasing a clearance.
Describe the general procedure for switching a line back into service.