Re: Danger, and I don't understand why.

Hi all,

The energy may be even higher.  If the primary is disconnected at the peak
of the input current the energy stored in the magnetisation flux (not the
current or windings) of the primary may get transferred to the secondary and
may add to its stored energy.

Presumably this will happen even on a shorted pole pig which I assume has
little shunt inductance.  The time constant is an increasing function of the
core and copper volume so in general the time constant will be longer for a
larger transformer.  Also the maximum stored energy is proportional to the
core volume so that will be greater for a larger transformer.  So be careful
with those big pole pigs.

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: 16 August 1999 09:51
Subject: Re: Danger, and I don't understand why.

>Original Poster: Michael Tucknott <Michael.Tucknott-at-virgin-dot-net>
>Hi Terry & all
>Big snip ola--
>> Also consider the energy stored in the transformer.  If it is a 60mA
>> transformer and you happen to catch it at the peak current of 85mA.  Then
>> the energy stored per leg is 0.5 x L x I^2.  It this case, 0.5 x 3711 x
>> .085^2 = 13.4 joules!!  Given both legs, the neon can store almost six
>> times the energy the primary cap can!  So the neon by not only be able to
>> shock you but easily kill you too!!!  Dangerous indeed....
>> Cheers,
>>         Terry
>If this true for NST`s and OBIT`S would the same occur with the
>more powerfull pole pig or PT.
>Also if you are using MOT`s to limit your pig could thay retain
>a residual charge on there windings.
>Thanks to all for making Tesla coiling a safer hobby.
>Mike Tucknott
>If at first you don`t succeed......
>It must be someone else`s fault so
>Find them; Blame them; Make them pay