Re: Another 942C failure mode?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Ward <steve.ward@xxxxxxxxx>

Steve C,

Wow, that just confirmed what my simulations said!  I was pushing
about 90A RMS when the caps failed.

I ran the coil again last night, but was plagued by secondary to
primary flashing due to the humidity (its not always a problem).  Once
i finally got the insulation fixed, it was about time to wrap it up.
Only got maybe a 45 second solid run at full power.  The MMC was still
cool after that.  I kept it to 175uS which should be about 85A RMS
from my sim, which should be no problem for 6 strings of caps.

Steve Ward

On 6/12/05, Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: Steve Conner <steve@xxxxxxxxxxxx>
>
> At 10:16 12/06/05 -0600, you wrote:
> >i dont know the RMS current... I do know the peak current was about 800A
>
>
> You can roughly estimate the RMS current from the peak current:
>
> Irms ~= Ipeak*sqrt(burst length/period between bursts)*(1/sqrt(2))
>
> So if your peak current was 800A, your burst length was 250us, and your
> breakrate was 120Hz, the RMS current would be about 90A.
>
> This formula holds for spark gap coils too but the constant is nearer 1/2
> than (1/sqrt(2))
>
>
> Steve Conner
>
>
>
>