Induced current on disconnected power distribution line
Induced current on disconnected power distribution line
(OP)
Hi,
We had an incident where a lineman was installing a new line across a road. There are two parallel circuits with one disconnected and grounded at one end. There was a high voltage measured at the other end of the disconnected line.
Does anyone know where I might find information on how to calculate this induced voltage/current based on the proximity of the line to the disconnected line?? We need to change our grounding / work practices to minimize the chance of a bigger problem occurring....
Thank you,
Veman
We had an incident where a lineman was installing a new line across a road. There are two parallel circuits with one disconnected and grounded at one end. There was a high voltage measured at the other end of the disconnected line.
Does anyone know where I might find information on how to calculate this induced voltage/current based on the proximity of the line to the disconnected line?? We need to change our grounding / work practices to minimize the chance of a bigger problem occurring....
Thank you,
Veman






RE: Induced current on disconnected power distribution line
RE: Induced current on disconnected power distribution line
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RE: Induced current on disconnected power distribution line
Thanks again!
Veman
RE: Induced current on disconnected power distribution line
First, maybe you're missing something when you wrote:
.
Secondly, 1910.269(n)(3) defines the requirement for ensuring an "equi-potential zone" as:
"Equi-potential zone." Temporary protective grounds shall be placed at such locations and arranged in such a manner as to prevent each employee from being exposed to hazardous differences in electrical potential.
Your people don't have to touch the wires, use clamps in doing the chaining to ground.
Third, and most most important; "your people should start grounding at the ground stubs/ terminals, them jumpering the lines to be worked-on.
Feels great to be of help.
RE: Induced current on disconnected power distribution line
A few suggestions that have been used by some utilities:
Drive corner posts and flag off a 20 ft. or 30 ft. square centered on the ground rod.
Connect all safety grounds together.
In severe cases, consider multiple ground rods onterconnected and flagged off.
Bill
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"Why not the best?"
Jimmy Carter
RE: Induced current on disconnected power distribution line
Veman.