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[Amps] Voodoo Magnetic Fields

To: <amps@contesting.com>
Subject: [Amps] Voodoo Magnetic Fields
From: garyschafer at attbi.com (Gary Schafer)
Date: Sat Feb 8 21:27:11 2003

2 wrote:
> 
>>Jeffrey Madore wrote:
>>
>>>As I alluded to, I think we can leave the terrestrial magnetic field 
>>>out of the equation.
>>
>>That is clear from Eric's calculation.
>>
>>
>>>A length of power cable in free air exhibits the property of inductive 
>>>reactance when there is AC current flow. This XL results when the 
>>>cables own magnetic field expands and collapses about the conductor 
>>>itself. The result is a CEMF which produces current that is out of 
>>>phase with the source current and thus bucks or impedes the flow of 
>>>current from the source. Hence, we have these two current components 
>>>which are out of phase, producing magnetic reaction and mechanical force.
>>>
>>
>>If you can describe the scenario, you can predict the force. Please may 
>>we see a calculation?
>>...
> 
> **  not until someone measures the currents present during the event that 
> preceeds a 3-500Z fil/grid short.  So far, the only quantity we can guess 
> at is the >15a it takes to melt #28 Cu in the grid's DC return path.
> 

Hi Rich,

If you can estimate the duration of the pulse that causes havoc maybe 
you could then determine how much current would be present to cause the 
#28 to melt. I will bet that it takes lots of amps to melt the wire with 
a short duration pulse.

73
Gary K4FMX


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