Re: [TCML] Old HV Caps Help needed to get more info

[Bert Hickman <bert.hickman@xxxxxxxxxx>]

Tesla wrote:
> Team
>
> Can anybody on the list tell me more about these capacitors please, WEB
> searches fruitless due age of items
>
> Marcon SH Type
> Mfrs Number JPBD232L167K1
> Made 1987
> 160uF 2300v wkg
>
> see link for more
> http://www.trademe.co.nz/Browse/Listing.aspx?id=439443501
>
> Thanks
> Ted L in NZ
> _______________________________________________
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Some educated guesses:
Looking at the relatively small size of the terminals, these were likely 
used for light to moderate pulsed power duty, perhaps for driving flash 
tubes. Marcon stopped using PCB's in their caps in 1972, so these are 
safe from that perspective. The SH designation means that they use 
metalized electrodes and they may use self-healing technology (the SH 
designation). There are numerous Japanese patents by Marcon dealing with 
various self-healing approaches near the time frame of manufacture. The 
higher internal resistance of metalized electrodes tends to limit the 
peak discharge current rating compared to foil electrodes. The 
dielectric system is likely Mylar, paper, or a composite, immersed in a 
dielectric fluid.

These caps should be good for low duty cycle energy discharge 
applications, such as pulse forming networks, laser flash tubes drivers, 
defibrillators, or pulsed magnetizers. They will likely perform poorly 
in high frequency applications. Even though their test voltage is 
significantly higher, I would not recommend using them above their rated 
voltage to prolong life.

Bert
--
Bert Hickman
Stoneridge Engineering
http://www.capturedlightning.com
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