Re: [TCML] HV wire ?

[Michael Twieg <mdt24@xxxxxxxx>]

We might peak at 2000amps, and if we burst at a high repitition rate the rms
primary current could feasibly get that up to 500A.  We definitely couldn't
run that high for extended periods of time, though.  And no, we're not
looking at 10MW or something ridiculous.  The load is mainly reactive, not
resistive, so we're only looking at real power delivery of maybe 30KW
average.

And the wire has to be somewhat flexible, so tubing isn't an option.  It
will probably need to be between 1 and 2 meters long.  IMO this isn't
incredibly critical, but we wanted a pro solution if possible.

-Mike

On Tue, Jun 15, 2010 at 9:24 AM, jimlux <jimlux@xxxxxxxxxxxxx> wrote:

> Michael Twieg wrote:
>
>> This is for out DRSSTC, the cable going between the primary coil and
>> primary
>> capacitor.  The primary will see maybe up to 500 amps RMS, and the voltage
>> at that note may be up to 15KV peak.  We were advised by a professional
>> power electronics engineer to not simply throw rubber insulator on a
>> cable.
>> Apparently air between the conductor and insulator will ionize, which will
>> chemically degrade the insulation over time.  We were just looking for a
>> more robust solution.
>>
>>
> They're right about the insulation degradation.
>
> But, as others have posted, why insulate at all?
>
> 500A RMS?  at 15kV that's almost 10 Megawatts.
>
> Perhaps you mean you've got pulses, during the pulse you've got 500A RMS?
>
> Anyway, you're looking for tubing here, both for the low inductance, and
> because at the frequency, skin effect means that you're only using the
> outside layer of the wire, so why spend the money on copper you aren't
> using.   Use 1/2" copper tubing or something similar.  You could also
> probably use the shield of coax cable. you can connect the center conductor
> in parallel.
>
> In any case, trying to find insulated wire rated for the insulation is
> going to be a chore.
>
> Also, just how long a run is this?  And does it really make much
> difference?  If you went from AWG0 to AWG 20, it's going to be roughly a
> factor of 10 in AC resistance.  If the run is, say, 2 feet long, that's a
> few milliohms difference.  At 500Arms that's about 250W/milliohm, but I
> suspect that's pulsed(e.g. you don't have a handy 10 MW wall socket to plug
> into), and in any case, the average power dissipation will be quite low.
>
>
> Or, more practically, if you want insulated wire, get some AWG14 HV wire
> and try it.  If it melts, THEN go get your insulated copper bar stock...
>
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