Re: Capacitor Safety Discharge Method (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 6 Aug 2007 23:34:56 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Capacitor Safety Discharge Method (fwd)


One can make up an inexpensive HV relay using a standard 120 vac  1" 
solenoid.  Just mount a pair of tungsten contacts.  Use a small "leverage 
arm" so that the solenoid moves the contacts approx 3 inches and discharge 
thru a high power 5 Ohm wirewound resistor.  Works great and fab cost is 
around $25.

As someone else commented, always check with a hotstick in case the resistor 
ever blows out.  NE-2 neon bulb connected thru a 1 meg resistor in series 
(to ground)  attached to a plastic rod works good to detect any remaining HV 
charge.


Dr. Resonance

Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, August 06, 2007 9:54 PM
Subject: Re: Capacitor Safety Discharge Method (fwd)


>
> ---------- 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
>>
>>
>>
>
>
>