>
>
>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.
>
I agree, Gary. I have no idea of how long the duration is.
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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