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Re: Jennings vacuum interupter
From: gweaver[SMTP:gweaver-at-earthlink-dot-net]
Sent: Thursday, November 06, 1997 11:29 PM
To: Tesla List
Subject: Re: Dump the RSG!
The Jennings vacuum interrupter sounds interesting to me.
I don't know what a Jennings vacuum interrupter is or what it looks like.
Do you have a picture of Jennings vacuum interrupter that you could scan and
post?
The local power here throws out all kings of interesting stuff at the scrap
yard. I usually look it over to see if I can figure out something useful to
do with it. Last week the power company dumped 2 dump truck loads of
insulator of very size and shape you can think of. The scrap yard smashed
them all by dropping the electro magnet on them, then picked up all the
metal pieces. 2 weeks before that they threw out a 200KW sub station HV
transformer, it was an old antique with 24" long insulators but it still
worked according to the guy that dumped it. There are other things like
switch gear, disconnects, HV fuses and other misc things from the power
company. I might be able to find some Jennings vacuum interrupters at the
scrap yard if I knew what they look like.
Gary Weaver
At 09:31 PM 11/6/97 -0600, you wrote:
>
>From: John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
>Sent: Thursday, November 06, 1997 6:20 PM
>To: Tesla List
>Subject: Re: Dump the RSG!
>
>At 08:45 PM 11/6/97 +0000, you wrote:
>>
>>From: Jim Lux[SMTP:jimlux-at-earthlink-dot-net]
>>Sent: Thursday, November 06, 1997 10:15 AM
>>To: Tesla List
>>Subject: Re: Dump the RSG!
>>
>>
>>
>>> I am trying to find out if an acquaintance of mine from some
>>> years ago is still around, he was/is a vacuum tube design engineer,
>>> and I recall him telling me about designing a tube for use in
>>> switching currents to a commercial induction furnace, for switching
>>> the juice on and off, and I have to believe that would involve
>>> huge emissions. And I dont mean fifty years ago; when I last saw
>>> him, he was retired, but still designing freelance, due to popular
>>> demand. (I am 37 years old)
>>> Food for thought....
>>> Randy
>>
>>Possibly an Ignitron or other mercury vapor switch tube? Ignitrons are
>>fired by a voltage pulse to a trigger electrode. There is a bipolar Hg
>>vapor tube that is fired by a magnetic field on the Hg vapor causing it to
>>ionize, etc...
>
>-----------------------------------------------------------------------
>
> Jim -
>
> We have replaced an RSG with a Jennings vacuum interrupter and it is
>giving superior performance. They are tricky to adjust but once adjusted
>require no further attention. There are no moving parts so there is no
>maintenance. These are standard electric utility switches and are sometimes
>available at surplus stores. Most people do not know what they are so they
>are sometimes a real bargin. A typical unit is only 2 1/2 " diam x 6 " long
>and cost $200 and up new. The rating is 34 KV, 10000 amps (momentary rating).
>
> They will give you a dampened sine wave instead of a continuous sine wave
>like solid state devices. A dampened sine wave gives a higher voltage for
>the same energy and number of cycles compared to a continuous wave. They are
>an ideal replacement for an RSG. However, more experimenting for Tesla coil
>use is required.
>
> John Couture
>
>
>
>
>