RE: [TCML] Mains Suppression Filter

["Reverend Fuzzy" <pastor@xxxxxxxxxxxxxxxxx>]

Nice filter... I personally prefer the ones made by Corcom.

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Michael Gray
> Sent: April 04, 2013 7:22 PM
> To: Tesla Coil Mailing List
> Subject: [TCML] Mains Suppression Filter
> 
> Hi all
> 
> Unfortunately, I've been forced to put the construction of my coil on hold
> for a couple of months as I've had very little time to myself - but I'm
> back to it now, and it's nearing completion. Really excited!
> 
> I'm not sure if it's common practice to implement a suppression filter to
> protect ones mains circuitry, but I would very much like to do so. The more
> isolated my TC project is from the rest of the house, the better. So I've
> had a look around for some devices that would do the job for me, and I've
> come across this one from Schaffner:
> 
> http://docs-europe.electrocomponents.com/webdocs/0e23/0900766b80e23106.pdf
> 
> The one in particular I'm looking at is the 10A version, with surge
> suppression. But I could use some help understanding the datasheet!
> 
> Having looked at the attenuation vs frequency graph for the 10A unit, I can
> see that the filter achieves its 3dB cut-off somewhere between 10kHz and
> 20kHz, for the "A" configuration - and it gives:
> 
> A = 50Ohm/50Ohm sym
> 
> I'm not understanding that completely - should I be looking at the "A" line
> or another?
> 
> Secondly, I like this device as it has surge protection built in too, and
> it gives the following info for it:
> 
> Surge pulse protection: 2kV
> 
> Is this a suitable rating for overvoltage? My understanding is this - I
> already have a Terry filter with the safety spark gaps in place to protect
> my NST, so I can more or less assume that no HV is going to make it back
> into my NST and hence the only way for voltage spikes to appear on the
> input side of the NST (i.e. mains side) is if the coil sparks out and
> strikes something on the input side (or possibly through magnetic induction
> on input wiring?). If this is the case, then the 2kV rating would be more
> than adequate. So I'd appreciate a sanity check on this, as I have more
> than likely missed something (it's quite late here in the UK).
> 
> Anyway I'd appreciate your thoughts and feedback on everything I've
> mentioned.
> 
> Many thanks!
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