Author Topic: Coax cable for DRSSTC interrupter?  (Read 286 times)

Offline Simranjit

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Coax cable for DRSSTC interrupter?
« on: July 02, 2024, 11:29:18 PM »
Hi, I read somewhere on this website that it might be possible to use coax cable for interrupter for DRSSTC. I'm using esp32 as interrupter.
My question is that coax cable has only one conductor, so should I use two coax cables ? One for signal and one for ground?
Maybe use two power supplies? One for esp32 and another for optocoupler connected with coax cable.
The if-d95 is a bit pricey in my opinion.

Also, sorry to hijack my own question. What is regular core size for feedback and OCD for DRSSTC?

Offline verliebt_in_neukölln17

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Re: Coax cable for DRSSTC interrupter?
« Reply #1 on: July 03, 2024, 01:19:50 AM »
Hey,
Yes that can be an option, but make sure to properly deal with electromagnetic interference.

Any ferrite core with a diameter upwards of 2cm~ should work.
« Last Edit: July 03, 2024, 01:22:30 AM by verliebt_in_neukölln17 »
My semiconductors went kapow, IGBTs are fried somehow.
With sparks and pops, they took a flight,
Turning day into night!

Offline flyingperson23

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Re: Coax cable for DRSSTC interrupter?
« Reply #2 on: July 03, 2024, 02:19:03 AM »
I would highly recommend using fiber. It's relatively cheap, easy, and much safer. Aside from the problem of "metal link to a thing full of very lethal voltage", if a secondary arc hit the coax cable it would probably end up pretty bad for you, your interrupter, and the coil. The if-d95 is 9 dollars on digikey. Considering a drsstc will kill you if you're not careful, I think it's very much worth it.

Coax has 2 conductors. The name coaxial refers to the property of both conductors sharing the same axis. The second conductor might look like a mesh shield around the first.

The cores I've seen used the most are the ferrites from https://www.easternvoltageresearch.com/components/magnetics/

Offline Admiral Aaron Ravensdale

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Re: Coax cable for DRSSTC interrupter?
« Reply #3 on: July 03, 2024, 07:29:53 PM »
I just sucscessfully tested CAT 7 LAN Cable for signal transfer, from a shielded metal transmitter box to the metal receiver box.
But like stated Fiber is a much safer way!!!

Offline Simranjit

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Re: Coax cable for DRSSTC interrupter?
« Reply #4 on: July 03, 2024, 08:24:50 PM »
I just sucscessfully tested CAT 7 LAN Cable for signal transfer, from a shielded metal transmitter box to the metal receiver box.
But like stated Fiber is a much safer way!!!

I ended up using 2x coax cable. I will just connect shield of cable to ground and I think I will be good. This is just for testing phase and maybe I will eventually I will upgrade to fiber optic. I thought about using shielded Ethernet cable but I got coax cables for cheap from dollar store. I am using separate power supplies for esp32 (and a optocoupler) and 555 as a inverted buffer (and a optocoupler). Signal is pretty sharp at end of coax cable with rise and fall time of 60ns.

Offline Admiral Aaron Ravensdale

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Re: Coax cable for DRSSTC interrupter?
« Reply #5 on: July 03, 2024, 08:48:13 PM »
I buy 4sets of them for Syntheruptor and UD2.7
https://de.aliexpress.com/item/1005005104301226.html
Used but working and for a fair price!



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Re: Coax cable for DRSSTC interrupter?
« Reply #5 on: July 03, 2024, 08:48:13 PM »

 


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