Thread-topic: Need Energy Discharge Capacitor Information
Bert,
I have a question about the temperature specs. Is the minimum temperature a storage and operational temperature or is it operation only? I ask because before I knew about this I am certain that these caps may have experienced storage temperatures below 14 degrees F at some time (I live in Iowa). They have never been operated below 14 degrees F.
Steve
----- Original Message -----
From: "Bert Hickman" <bert-hickman@xxxxxxxxxxx>
To: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Saturday, June 16, 2018 3:17:41 PM
Subject: Re: [TCML] Need Energy Discharge Capacitor Information
Hi Steve,
Steve White wrote:
> I have two energy discharge capacitors for which I am seeking additional information. I have searched the internet and sent questions to the manufacturers to no avail. This is what I know about the two capacitors from the nameplates.
>
> Capacitor #1:
>
> * Manufacturer: Maxwell
> * Catalog Number: 33504
> * Capacitance: 106 uF
> * Maximum Voltage: 10 KV
This is a kraft paper-foil energy discharge capacitor with castor oil
dielectric as the fluid. The other specs for this cap follow:
Rated %VR: 80% (Most energy discharge caps are only 20% VR)
Max %VR: 100%
Rated Id: 150 kA
Max Id: 300 kA
Irms: 75 A
Inductance: 40 nH
Design Life at rated V and I: 10,000 shots (90% survival)
DC Life: 75 hours
Max/Min T: 40/-10 Degrees C
>
> This is one of the big orange units that I have seen others use in various HV pulse discharge projects. I have a section of an old Maxwell catalog but this particular model is not listed.
>
> Capacitor #2:
>
> * Manufacturer: Aerovox
> * Catalog Number: PM223YW099D01
> * Capacitance: 102 uF
> * Maximum Voltage: 22 KV
This cap also uses a kraft paper-foil dielectric system with castor oil
dielectric fluid. This cap (as are all Aerovox in the PM series) is
rated for 20% VR. I don't have any other specs, but looking at the cap
and its massive terminals, it's good for at least 100 kA. Keep voltage
reversal below 20% and either cap should outlive you.
Neither cap is self-healing, but they're both excellent caps for quarter
shrinking or can crushing. Don't let either stay below 14 F for any
extended time though. The castor oil starts clouding (solidifying) and
the cap will fail when being charged. Ask me how I know... :)
Good luck and play safely!
Bert
>
> This is one of the big gray blocks that I have also seen. I have also seen similar Aerovox units used in HV pulse discharge projects.
>
> Primarily what I am seeking is maximum number of shots and maximum allowable voltage reversal. I know that these capacitors are not suited for tesla coil use. I am going to use them to build a quarter shrinker and a ring launcher. Please, I don't need any safety warnings or such. I have been building tesla coils for many years. Any additional information about these capacitors would be greatly appreciated.
>
> Steve
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>
>
-
Bert Hickman
Stoneridge Engineering LLC
http://www.capturedlightning.com
+1 630-964-2699
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