HV 4kv+ screw terminals? - Page 1
Forum section: electronics / projects

author: robotseth
author_rank: Newbie
timestamp: July 19, 2016, 07:23:34 pm
content: 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

author: daqq
author_rank: Super Contributor
timestamp: July 19, 2016, 07:49:38 pm
content: 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/2301315At high voltages you should be aware though of things like corona discharges at sharp edges.

author: Someone
author_rank: Super Contributor
timestamp: July 19, 2016, 11:00:13 pm
content: 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.

author: PartialDischarge
author_rank: Super Contributor
timestamp: July 20, 2016, 02:45:52 am
content: 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...

author: robotseth
author_rank: Newbie
timestamp: July 20, 2016, 03:13:23 am
content: Thanks for the help!

author: Cicada
author_rank: Regular Contributor
timestamp: July 20, 2016, 01:30:21 pm
content: Quote from: blueskull on July 20, 2016, 03:24:22 amYou need 4kVNote 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. 140MBAlso 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.htmlMaybe 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/3068558No 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=gridBulkhead connector for RG-58 >>http://www.hubersuhner.com/ProdDet/2776661Cable Connector for RG-58 >>http://www.hubersuhner.com/ProdDet/2432855You would probably be better off using terminal blocks.Never tried these guys.www.hivolt.deMaybe worth a try.

author: Someone
author_rank: Super Contributor
timestamp: July 20, 2016, 10:54:21 pm
content: Quote from: Cicada on July 20, 2016, 01:30:21 pmThere certainly are RG-58 and RG-59 sized cables that are able to be rated for 10kV:http://www.solidsealing.com/technical/documents/feedthrough_voltage_test.pdfhttp://rfshop.com.au/coaxial-connectors/10kv-high-voltage/10kv-plug-suit-rg58-10kv-3100-0058.html