[PSUBS-MAILIST] Penetrator materials

[Sean T. Stevenson via Personal_Submersibles]

Electrode diameter will be set by the voltage / current requirement of the circuit, just as you would size wire. Consider the total length of the wire run including the penetrator, and size for the allowable voltage drop. Allow for a bit of extra resistance in mechanical connections.

The distance between the electrode and the surrounding metal, through the potting compound, is dependent on the rated dielectric strength of the compound and the maximum voltage that the electrode will see.

Sean


On May 18, 2017 11:30:33 AM MDT, Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Are there any standards regarding electrical penetrators (battery pod
>to pressure hull) ie electrode diameter,insulator thickness ?   
>--------------------------------------------
>On Wed, 5/17/17, Alan via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
> Subject: Re: [PSUBS-MAILIST] Penetrator materials
>To: "Personal Submersibles General Discussion"
><personal_submersibles at psubs.org>
> Date: Wednesday, May 17, 2017, 7:08 PM
> 
> Thanks
> Sean,I filed
> a conical penetrator design, but had forgotten about
> it!Alan
> 
> Sent from my iPad
> On
> 18/05/2017, at 9:28 AM, Sean T. Stevenson via
> Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
> 
> If you machine the
> hole through the penetrator as a conical cavity rather than
> cylindrical, and then use a potting epoxy with some
> compliance / flexibility, the pressure acting to push the
> potting compound into the hole will also develop some
> increased compressive force around the electrodes.
> Sean
> 
> 
> 
> 
> On May 17, 2017 1:55:51 PM
> MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
> Hank,If
> I cover everything with the glue & then the
> polyurethane, I won't need to rely onthe epoxy for sealing.
> If the cable was cut then the system would rely on the
> epoxyas a
> back up. At that stage I could put up with a temporary
> dribble; the electrics wouldbe shorting out as
> well. I will be wary of stripping back enough of the wiring
> sheath,but
> failure can also occur between the epoxy & wall of the
> penetrator.Cheers Alan
> 
> Sent
> from my iPad
> On 18/05/2017, at
>12:02 AM, hank pronk via Personal_Submersibles
><personal_submersibles at psubs.org>
> wrote:
> 
> Alan,That
> is not correct, the epoxy will not stop the water past 1,000
> psi completely.    If the wires are stripped back
> further so the sealant creates an extra layer against
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