[Prev][Next][Index][Thread]
Re: Unexpected Shock From TC
Is it possible to be injured by static, or can I freely zap myself since
I'm too lazy to touch a ground wire to my secondary?
At 12:17 PM 5/5/99 -0600, you wrote:
>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
>At 01:27 AM 5/5/99 -0500, you wrote:
>>
>>
>>
>>To Bill Langston, and all coilers:
>>
>> I noticed in your post that you (Bill) wrote that you got a shock by
>>touching the TC long after it was turned off. I know of two reasons why
>>this might happens, and how to fix each of them.
>> One cause is that the tank capacitor can hold quite a charge after the
>>coil is shut off. It usually bleeds off through the circuit after a few
>>seconds, maximum. However, according to Terry Fritz, if some connection
>>in the circuit is disconnected, this bleeding off may not happen. Ask
>>around for ideas about bleeder resistors across the tank capacitor, and
>>other ways to fix this.
>> More likely, though, is that the secondary can hold a charge, too. I'm
>>not sure if it has to do with the self capacitance of the coil, or the
>>varnish on it, or what. However, I know that most big coils I have seen
>>could give quite a zap if you touched the secondary, even several minutes
>>after operation. Usually, the operator would take a grounded wire and
>>touching it to the secondary to remedy this.
>>
>> Again, just thoughts of mine.
>>
>>
>>
>> Brent
>
>Coils that have thick coat of varnish can store pretty powerful static
>charges on the varnish. Coils can charge this dielectric layer to
>extremely high voltage so that there can be an unexpectedly powerful charge
>stored on this seemingly benign dielectric surface. One solution is not to
>coat the coil with a thick layer which keeps the windings near the surface
>where they will act to ground out the electrostatic charges. Another (used
>by most) is just to realize the static charge is there and prepare one's
>self before grabbing it :-))
>
> Terry
>
>
>
>
Christopher Michaelis
cmichael-at-xmission-dot-com
Pretium Corporation
t:(435) 797-4100
f:(815) 364-1274