Author Topic: HV 4kv+ screw terminals?  (Read 2254 times)

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Offline robotsethTopic starter

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HV 4kv+ screw terminals?
« on: July 19, 2016, 07:23:34 pm »
Hi, I have a project idea which uses high voltage. ;) I need a way to connect wires to a pcb as a power input. The problem is that I can't find screw terminals or similar connectors for 4kv or up. My project requires less than an amp so amperage won't be a problem.

Thanks,
Robotseth
 

Offline daqq

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Re: HV 4kv+ screw terminals?
« Reply #1 on: July 19, 2016, 07:49:38 pm »
Well, you won't find standard screw terminal BLOCKS very easily, however you can easily buy single screw terminals that can be soldered into a PCB and place them as far away from one another as you need. See: http://uk.farnell.com/keystone/8196/pc-screw-terminal/dp/2301315

At high voltages you should be aware though of things like corona discharges at sharp edges.
« Last Edit: July 19, 2016, 07:51:58 pm by daqq »
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Online Someone

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Re: HV 4kv+ screw terminals?
« Reply #2 on: July 19, 2016, 11:00:13 pm »
The typical solution has been to buy standard size/shape terminal blocks but have empty (not just unused) positions between the high voltage and other signals, or as above place two individual single pole connectors a suitable distance apart.
 

Offline PartialDischarge

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Re: HV 4kv+ screw terminals?
« Reply #3 on: July 20, 2016, 02:45:52 am »
Do as daqq says, screw terminals, separated apart like 10cm, its the cheapest solution. And use hv cable, not any cable you have laying around...
 

Offline robotsethTopic starter

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Re: HV 4kv+ screw terminals?
« Reply #4 on: July 20, 2016, 03:13:23 am »
Thanks for the help! :D
 

Offline Cicada

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Re: HV 4kv+ screw terminals?
« Reply #5 on: July 20, 2016, 01:30:21 pm »
Try SHV or MHV, much smaller than a sparsely spaced terminal block, plus you get a coax shielded HV cable that is no longer a hazard anymore unless you severed it.

You need 4kV
Note that the SHV spec say:
Dielectric withstanding voltage (at sea level) = 5.0 kV rms, 50 Hz (depending on cable)
Working voltage (at sea level) = 3.5 kV rms, 50 Hz (depending on cable)
A bit difficult to get the pdf catalog for Huber Suhner. Send me a request to share it. 140MB

Also note that the Huber Suhner catalog and website never seem to be complete. I have ordered Radiation Hardened connectors that are not listed on the website or catalog. PolyStyrene isolator. You will have to work with your local distributor if you want to try to see if there are any other non-standard (not RG-58 RG-59) SHVs not listed in the catalog. But I doubt it. Which brings me to my next point.

RG-58 RG-59 are not rated for 4kV. Look at this. http://www7.taosnet.com/ebear/coaxlist.html
Maybe some cable gurru or yourself can check which higher rated cable will fit into the connector. The important cable dimensions are the outside diameter of the isolation between screen and center conductor because it must fit into  the back of the connector housing. And the diameter of the center conductor because you must be able to crimp the pin with a very expensive crimper onto teh center conductor.

Which brings me to my next point. Inside your device you can also look at this type of SHV. http://www.hubersuhner.com/ProdDet/3068558 No screen. But you must still look at the outside RG cable.

Just be prepared to fork out the US$. SHVs are not cheap.
https://www.pasternack.com/nsearch.aspx?sort=y&Category=Connectors&Rfinco99con1series=SHV&view_type=grid

Bulkhead connector for RG-58 >> http://www.hubersuhner.com/ProdDet/2776661
Cable Connector  for RG-58 >> http://www.hubersuhner.com/ProdDet/2432855

You would probably be better off using terminal blocks.

Never tried these guys. www.hivolt.de Maybe worth a try.
 

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