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Re: Jennings HV Vacuum Relay Data


From:	richard hull [SMTP:rhull-at-richmond.infi-dot-net]
Sent:	Tuesday, November 11, 1997 9:01 PM
To:	Tesla List
Subject:	Re: Jennings HV Vacuum Relay Data

At 10:35 PM 11/10/97 -0600, you wrote:
>
>From: 	terryf-at-verinet-dot-com[SMTP:terryf-at-verinet-dot-com]
>Sent: 	Monday, November 10, 1997 7:24 PM
>To: 	Tesla List
>Subject: 	Re: Jennings HV Vacuum Relay Data
>
>SNIP----------------------------------------------
>>
>>  Terry -
>>
>>  The vacuum relays are not the same as the vacuum interrupters and have
>>smaller electrodes. The interrupters have much larger electrodes and are
>>rated upto 1200 RMS amps continuous duty. However, the smaller electrodes
>>should work with smaller coils. Try the San Jose, CA address I gave in
>>another post.
>>
>>  John Couture
>>
>
>Hi John,
>        You are correct!  The Jennings web site is up and functional now
>(www.jenningstech-dot-com) and it tells all about their interruptors.  They even
>have them mounted on solinoid actuators that can be easily run electrically.
>This would make some of the "tricky" adjustments much easier I would think.
>Now that I think about it I have used the older versions of these for
>another use.  They were nice because if the contacts get welded, you can
>often force them back apart and be up and running again.  The new ones look
>like this would not be a problem, however.  I imagine they are very expensive??
>
>        Terry
>

 
Big vacuum power contactors are no good for Larger Tesla systems at all.
The heat transfer is lousey and they are not very stable over time the way
an air gap is.  The big giant vacuum contactors are laying about in our
scrap yard by the ton!  We had an initial love affair with them, but the
honeymoon was over quickly.  One must remember that in normal operation they
are used for one commutation per year if that!!!  Several hundred
commutations per second is a real no no and just a bit outside their spec.

They will work on real small systems under 1 KW, but are finicky and usually
weigh more that the coil.

Richard Hull, TCBOR
>