Answer Posted / trevor
Think of a perfectly calm lake or pond, not a ripple in it.
Then you throw a large rock out into it. Ripples start from
that point and disperse 360 degrees outwards. The ripples
near the centre are higher and closer together than the
ripples further away from the point of impact, eventually
decreasing to no ripples at all as the surface tension of
the water takes over.
Now, in place of a lake or pond you have a field with a
high voltage(tension) power line in it; let's say 13,800
volts.
In place of the rock you have one of the high voltage lines
from the power pole that dropped into the field and is
making contact with the ground.
As the energy leaves the line and enters the ground, it
disperses outwards 360 degrees, gradually being absorbed by
the earth (or meeting enough resistance from the earth to
negate the energy) Unlike a pond, however, the energy
doesn't disperse evenly as different types of soil provide
less or more resistance than others.
As in the pond, the voltage that is nearer the point of
impact is higher than the voltage further out, i.e., 13,800
volts at impact, 9,000 volts a metre away, 6,000 volts a
metre from that and so on.
The concern is this; if you started walking towards the
downed line (at around one metre per step) from let's say a
hundred metres away, at first you'd be walking on ground
that has no voltage present. As you got closer the voltage
between your forward leg and back leg would be 100 volts.
Next step, 400 volts, then 1,000 volts. At some point
closer to the centre, you would take a step that is of a
high enough voltage (difference in potential between your
front and back foot) to either go through the footwear you
have on or jump over your footwear and go directly into
your legs. You are then creating a pathway for the voltage
to travel in and would have all of that voltage and
ampacity go through you.
| Is This Answer Correct ? | 35 Yes | 2 No |
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