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Re: maxwell pulse cap. (fwd)
Original poster: List moderator <mod1@xxxxxxxxxx>
---------- Forwarded message ----------
Date: Sat, 12 May 2007 13:46:25 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: maxwell pulse cap. (fwd)
Hi David,
Nope, we don't want heating of course. But some caps are designed this
way. My CSI's do have "this side up" text which is what triggered the
thought.
Take care,
Bart
Tesla list wrote:
>Original poster: List moderator <mod1@xxxxxxxxxx>
>
>
>
>---------- Forwarded message ----------
>Date: Thu, 10 May 2007 05:40:20 -0500
>From: David Rieben <drieben@xxxxxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Cc: David Rieben <drieben@xxxxxxxxxxxxxxx>
>Subject: Re: maxwell pulse cap.
>
>Hi Bart,
>
>Well I didn't think about it like that, but there isn't any
>text stating "THIS SIDE UP" on the cap that I can see. It
>is one of the standard 4x6x10 white plastic case Maxwell
>pulse caps. Like I said, I've had a couple of other Maxwell
>caps, one of the same case dimensions as this one but I ne-
>ver did notice the slosh before. As far as the hydraulic pres-
>sure issue, I think the white plastic case may have a bit of "give"
>to it so that the internal pressures wouldn't reach critical levels
>with reasonable heating.? Besides, we don't want much heating
>of the internal dielectric anyway, do we, as this would mean
>an excessively lossy dielectric, which is BAD ;^)
>
>David
>
>
>----- Original Message -----
>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: <tesla@xxxxxxxxxx>
>Sent: Thursday, May 10, 2007 1:09 AM
>Subject: Re: maxwell pulse cap.
>
>
>
>
>>Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>>
>>Hi David,
>>
>>The slosh may have been by design. If it heats at all, the oil will
>>expand (needs a place to go otherwise hydraulic pressure will create
>>it's own avenue of escape). If there is any text on the cap like
>>"THIS SIDE UP", it's a good indication that it was designed to not be
>>completely filled.
>>
>>Take care,
>>Bart
>>
>>Tesla list wrote:
>>
>>
>>
>>>Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
>>>
>>>Hi Scott,
>>>
>>>I also have a Maxwell pulse cap that is rated at .075 uFd
>>>at 40 kV. Yours wouldn't happen to be model # 37217
>>>would it? From what I understand, the 37xxx series are
>>>better caps than the 31xxx series since they are rated for
>>>rapid pulse cycling (100 to 1000 pps). MOST of the 31xxx
>>>series are just rated for 1 pps. Anyway, I just won mine off
>>>of ebay recently and it appeared that it may have lost a small
>>>fraction of its original oil, as it had a bit of an internal "slosh"
>>>when I tilted it back and forth. I removed the threaded nylon
>>>plug and back-filled it with regular transformer oil. It probably
>>>took less than an eye dropper full to "refill" it. I rewrapped
>>>the threads of the nylon plug with plumber's teflon tape and
>>>screwed it back in. No leaks and BTW, there was no visible
>>>signs of external oil leakage before I refilled it, so it may have
>>>come from the factory with an air bubble, although I do find
>>>that hard to believe. No other Maxwells that I have ever had
>>>had any detectable internal "slosh" to it when titlted one way
>>>or the other.
>>>
>>>David Rieben
>>>
>>>
>>>
>>>----- Original Message -----
>>>From: "Tesla list" <tesla@xxxxxxxxxx>
>>>To: <tesla@xxxxxxxxxx>
>>>Sent: Tuesday, May 08, 2007 4:30 PM
>>>Subject: RE: maxwell pulse cap.
>>>
>>>
>>>
>>>
>>>>Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>
>>>>
>>>>Jim
>>>> It is a whopper, .075/40kV (tested at 45kV, and it is closer to
>>>>81nf than 75) as of right now, I am only using it with 8kV so it is
>>>>no problem, but I am looking for a pig or PT, which will give me
>>>>14.4kV which still doesn't seem that bad, half of 40 is 20. Does
>>>>anybody know where I can get some of that silicone based oil Dr. R
>>>>mentioned to refill it with, it still seems Ok, but I really don't
>>>>want it to die (it is really hard to make a capacitor with 80nf).
>>>>Scott
>>>>
>>>>
>>>>
>>>>
>>>>>From: "Tesla list" <tesla@xxxxxxxxxx>
>>>>>To: tesla@xxxxxxxxxx
>>>>>Subject: RE: maxwell pulse cap.
>>>>>Date: Mon, 07 May 2007 22:46:45 -0600
>>>>>
>>>>>Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
>>>>>
>>>>>Hi Scott,
>>>>>
>>>>>Which Maxwell is it? If it is the .03/35Kv we often see, it is rated
>>>>>
>>>>>
>for
>
>
>>>50%
>>>
>>>
>>>>>voltage reversal which means if you are up in the 12-15kv range, 2
>>>>>
>>>>>
>should
>
>
>>>be
>>>
>>>
>>>>>in series as the peaks are ~17K (on the line) and ~21k respectively.
>>>>>Submerging seems like good idea to me as it will help keep the heat
>>>>>
>>>>>
>down
>
>
>>>and
>>>
>>>
>>>>>the lost oil from being displaced by air or other contaminates.
>>>>>
>>>>>
>Someone
>
>
>>>>>please correct if I'm off here.
>>>>>
>>>>>Jim Mora
>>>>>
>>>>>-----Original Message-----
>>>>>From: Tesla list [mailto:tesla@xxxxxxxxxx]
>>>>>Sent: Sunday, May 06, 2007 10:05 PM
>>>>>To: tesla@xxxxxxxxxx
>>>>>Subject: maxwell pulse cap.
>>>>>
>>>>>Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>
>>>>>
>>>>>Everybody,
>>>>> I have a maxwell pulse capacitor, which I use for my 6-in
>>>>>coil. It seems to work just fine, but I have noticed that it leaks a
>>>>>small amount of oil (just a tiny bit, barely noticeable). Is this
>>>>>really bad, or perfectly normal? Should I place the capacitor in a
>>>>>bath of oil to prevent further leakage? Thanks.
>>>>>Scott Bogard
>>>>>
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>>>>>
>>>>>
>>>>>
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