Re: [TCML] GFI test

["Binny" <binny@xxxxxxxxxxxx>]

I'm not quite shure what you are trying to acomplish but any diode pair on 
both lege will give you 1/2 wave dc.If you want to fill in the bumps a full 
bridge will do the trick. Or a single diode would block half of the sign 
wave. An SCR switching at the crossover sounds trick to me but you might be 
talking over my head there a bit.  Just had to throw in my two cents worth 
anyway. Cheers (I take license to kidnap my farorite sign off)   Later... 
Binny...P.S. 30 ma might not have the nuggets to trip that GFCI
----- Original Message ----- 
From: "Timothy Patti" <vector42@xxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, March 30, 2011 9:17 AM
Subject: [TCML] GFI test


> Hi all,
>
> I recently installed a ground fault interrupter on my coil in an attempt 
> to
> get it to fire a single pulse for only 1/2 of the 60 HZ input cycle.  I
> positioned it before the varic controlling the supply voltage to the NST.
> Much to my surprise the GFI did NOT trip when the coil was energised.  The
> coil ran fine as if the GFI was not there.
>
> This type of GFI needs a constant supply of power to remain in the non
> tripped state so I was unable easily wire it in after the variac which is
> switched on the secondary side.
>
> Coil details-  7000 volt, 30 mA NST switched with a static sucker spark
> gap, 5 nF tank cap (MMC), magnifier configuration.
>
> Shunts were not removed from the NST.
>
> Does any one have any ideas for easily pulsing the coil for 1/2 AC supply
> cycle short of rigging a SCR to switch at zero cross over ?
>
>
>
> Tim
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