[TCML] Looking for pulse cap

[Quarkster]

David -

The current General Atomics/Maxwell datasheet for the Model 31427 gives a 
design life of 1.5X10E4 (15,000 shots) at 25KA, 100KV, and 20% voltage 
reversal. The life projections increase dramatically with reduced operating 
voltage and reduced voltage reversal.

http://www.maxwellcapacitors.com/series-s-ss-de-capacitors.html

See especially the operating voltage vs life and the voltage reversal vs 
life curves at the bottom of the spec page.

Regards,
Herr Zapp

----- Original Message ----- 
From: "David Rieben" <drieben at comcast.net>
To: "Tesla Coil Mailing List" <tesla at pupman.com>
Sent: Tuesday, September 15, 2009 6:35 PM
Subject: Re: [TCML] Looking for pulse cap


> Hi Herr,
>
> Wow, your Maxwell that you pulled out of storage sounds
> VERY familiar to the 4 that I have. Mine are the same case
> style and size that you stated except mine are model 31915
> and are rated at 0.44 uFd, @ 100 kVDC. They do have
> the same RMS and peak current rating as yours though and
> are also rated at just 1 pps. I actually got in touch with one
> of the capacitor engineers at GA and found the only caviat-
> they are only rated for 6200 shots. Of course, that would
> be at the full rated voltage, too, though and the life span
> of a cap tends to go up like exponentially with a correspond-
> ing drop in the working voltage below the max rated voltage
> value, i.e. they would probably last nearly for ever being
> pushed with a 14.4 kV pig in a typical ARSG coil system,
> assuming they weren't pushed too hard in the RMS cur-
> rent department.
>
> David Rieben
>
> ----- Original Message ----- 
> From: "Quarkster" <quarkster at att.net>
> To: "Tesla Coil Mailing List" <tesla at pupman.com>
> Sent: Tuesday, September 15, 2009 6:19 PM
> Subject: Re: [TCML] Looking for pulse cap
>
>
>> Dave -
>>
>> After a little searching, I found a 0.4uF, 100KV Maxwell in my storage 
>> area. It's a model 31427, white single-ended plastic case, about 4" X 6" 
>> X 29" tall. I bought this as a "used" part directly from Maxwell in San 
>> Diego during a "garage sale" several years ago. It's history is 
>> completely unknown, but I haven't done anything with it since I bought 
>> it.
>>
>> Maxwell's datasheet shows a peak current rating of 25K amps, RMS current 
>> of 25 amps, and an inductance of 20nH. However, rep rate is only 1Hz.
>>
>> The question is, what kind of a pulse rate "derating" could be applied if 
>> it was only used at 10KV and 2500 amps?
>>
>> Regards,
>> Herr Zapp
>
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