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Re: Capacitor Safety Discharge Method (fwd)
---------- Forwarded message ----------
Date: Tue, 07 Aug 2007 00:20:49 -0400
From: Crispy <crispy@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Capacitor Safety Discharge Method (fwd)
>From what I've seen, high voltage relays can be pretty expensive. I
think a much cheaper way to construct a device like that would be to use
pull-style linear solenoids, such as McMaster-Carr #70155K48 . However,
a single one of these solenoids would not be suitable if the max voltage
across the capacitors would be able to jump a 7/8" gap. Two solenoids
opposing each other would double the distance. I'm about to construct a
test device with two solenoids to do this. I'll use that above
solenoids from MCMaster-Carr, with round-headed screws for electrodes,
and several inches of HDPE for insulation between the solenoid and high
voltage.
On Mon, 2007-08-06 at 20:54 -0600, Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Mon, 06 Aug 2007 20:38:11 +0000
> From: nancylavoie@xxxxxxxxxxx
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Capacitor Safety Discharge Method (fwd)
>
> Hi, Chris. Thats exactly what I was trying to get an answer to in the
> previous posts and I think that if you kind of read between the lines in
> Bart's reply, you can see that its probably okay to do if you use bleeder
> resistors and discharge the cap after the charge has bled off. What I
> wanted to use was a Ross Engineering relay rated at 40 kv (normally open
> contacts) and wire it across the terminals of the capacitor and
> resistors.It would then just be a simple matter of flipping a switch and
> doing the work of the screwdriver in a much safer fashion.Anyone see a
> problem? Wyatt
>
> -------------- Original message --------------
> From: "Tesla list" <tesla@xxxxxxxxxx>
>
> >
> > ---------- Forwarded message ----------
> > Date: Mon, 06 Aug 2007 01:53:57 -0400
> > From: Crispy
> > To: tesla@xxxxxxxxxx
> > Subject: Capacitor Safety Discharge Method
> >
> > Hello,
> >
> > In light of the recent discussion about the necessity of a manual
> > discharge for the tank capacitor in addition to bleeder resistors, I've
> > been considering an easier method of manual discharge than the
> > stick-a-screwdriver-in-the-spark-gap method for my coil. I was thinking
> > about an electronic method, and here's the idea. Would it be possible
> > to have a linear pull-style solenoid with an electrode that, when
> > powered, would retract its electrode from another static electrode, to
> > act as the safety discharge? The normal state (no electricity applied)
> > would be to have the contacts together, and the capacitor shorted. Of
> > course, the electrodes would have to be insulated from the solenoid.
> > Also, would it be possible to immerse this under oil, if the gap
> > provided by the solenoid was insufficient to prevent sparking over in
> > normal operation, or would the oil coat the electrodes and somehow
> > prevent safety discharge?
> >
> > Thanks,
> > Chris
> >
> >
> >
>
>