Re: MUST SEE: "Helicopter Linemen" on History Channel!!
- From: "Don Kelly" <dhky@xxxxxxxxxx>
- Date: Wed, 06 Jul 2005 05:25:30 GMT
<mdmarshall@xxxxxxxxxxx> wrote in message
news:1120058125.642410.326500@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Man, you won't regret watching this show, it's incredible!!
>
> Tune In:
> Saturday, July 9, 2005 @ 11am ET/PT
>
> The remarkable story of the men who maintain and repair live
> high-voltage power lines--an elite team of pilot and lineman that looks
> for damage and makes critical repairs without turning the power off!
> "Barehanding" involves a helicopter flying up to live power lines,
> stretching a metal wand out to the line and energizing the helicopter
> and lineman to the full strength of the power line. The lineman,
> wearing a special metal fiber suit, then works on the wire by sitting
> on the helicopter skid or climbing onto the bare line. This technique
> makes the lineman, chopper, and pilot all part of the electrical
> circuit with 345,000 volts running through both men and machine. For
> two days, we follow members of the USA Airmobile team in Wisconsin as
> they risk their lives to inspect and repair critical power lines that
> were struck by a tornado. And we trace the development of this
> high-risk work, conceived of in 1979 by Mike Kurtgis, our guide through
> its electric history.
Just a pedantic comment.
You don't have "345000 volts "running through both men and machine.." Every
part of the men and machine is at the same voltage so the voltage <between>
the line and the workers is nearly 0. The current through the men is also 0
although there is a small current in the suits due to capacitive coupling
from the suits and helicopter to ground. (voltage to ground will be about
200,000V but they are not bridging between the line and ground).
--
Don Kelly
dhky@xxxxxxxxxx
remove the urine to answer
.
- References:
- MUST SEE: "Helicopter Linemen" on History Channel!!
- From: mdmarshall
- MUST SEE: "Helicopter Linemen" on History Channel!!
- Prev by Date: Re: EMI effects on Inertial Navigational Unit in a car.
- Next by Date: electrostatic field in a conductive media
- Previous by thread: MUST SEE: "Helicopter Linemen" on History Channel!!
- Next by thread: Re: Is angular momentum not conserved?
- Index(es):
Relevant Pages
|
