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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