Abstract :
This document proposes guidelines and definitions
for approach distances for contacting conductors, parts, and structures,
involving the safe use of a helicopter to position a worker to
work on energized and de-energized overhead lines using live-line
work methods.
This paper will serve as a basis to establish a guide for the use of
a helicopter when performing work on electric overhead lines.
Two known support systems are covered by this paper. Other
support systems must provide equivalent protection. As methods,
other than those included in this paper may be developed, they
should be thoroughly reviewed, before implementation, by qualified
professionals knowledgeable in the industries involved.
Statement of Purpose: To review and present, using sound engineering
practices, methods of safely bringing a worker into contact
with components of overhead lines while performing live-line work
from a helicopter.
To utilize safe approach distances, using air as an insulation, established
by ANSI/IEEE standard 516-1995 or applicable governmental
regulations and develop any essential factors to be considered
when applying these distances to the helicopter live-line work
methods.
To compile information into one document on what is proven and
safe live-line helicopter techniques. Comments are solicited for this
purpose into one document.
Background: Energized line work using a helicopter has been
successfully performed throughout the world on voltage up to and
including 800 kV. Proven efficiencies of utilizing helicopters for
live-line work can be enhanced by developing uniform safety requirements.
