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RE: High Voltage Filters
I believe in a center tapped NST that the house
ground is already connected to the case. At least
that is how my center tapped FranceFormer is setup.
You can check that with a quick ohm meter test.
Bill
> -----Original Message-----
> From: Tesla List [mailto:tesla-at-pupman-dot-com]
> Sent: Monday, February 14, 2000 7:33 AM
> To: tesla-at-pupman-dot-com
> Subject: High Voltage Filters
>
>
> Original Poster: "Samuel Rosset" <samr-at-bluewin.ch>
>
> Hi everyone!
>
> I am trying to find the best way to filter high frequencies and
> HV kikcbacks to
> protect my x-formers (two units in parallel).
>
> First I thought to use a system with two units of capacitors with one leg
> grounded to RFG, and some chokes or Resistors, and of course a safety gap.
> But I read somewhere that this design (one capacitor from each HV
> output to
> RFgnd) was working only if my transformer was center tap and the
> core grounded,
> and I don't understand why it is like that.
> I don't know if my x-formers (they are not NST's) are center tap
> or not, and I
> don't know if the core is grounded ( how do I check those two points)
> But my idea was to ground the x-former case to the house ground
> (It cannot be
> touch by sparks) and the bypass caps to RF grounds. For me, a cap
> has a very
> low impedence -at- high frequencies, and RF parasits would be
> trapped in those
> caps insted of going in the trannies windings... But obviously,
> this only works
> for center tap transformer...
>
> Can someone help me with this? what capacitance should I use for
> the bypass
> caps?
>
> I have a last question about the low voltage filter. Every low commercial
> filter I have found is design to protect what you plug in from
> interferencies
> from the house circuit (like a computer), but what we are trying
> to do here is
> the opposite : protect the house circuit from interferencies. Are
> those devices
> working both ways?
>
> Thank you for your help
>
> Sam
>
>