high voltage bushing likes this? could you identify? - Page 1
Forum section: electronics / general

author: littlepea
author_rank: Newbie
timestamp: January 21, 2025, 02:42:37 am
content: I posted on Beginner's forum but I couldn't remove. I reposted here. I will delete that one.all gurus I've been reading all types of catalogs whole day today without clue.this is called HV pothead or bushing, something might call as padmount bushing to recept hv cables or transformers. I've been searching for awhile and want to use it on my project but couldn't find where to buy this. it must be off the shelf I believe. I found bulky ones and weak ones like used on varian vac pumps or CT or x-ray machines , compared to this one those are trash. this is for 10kV Kilowatts use...the collar looks like Eaton isg-sd stuff but not sure about that .thanks

author: Poroit
author_rank: Frequent Contributor
timestamp: January 21, 2025, 07:56:05 am
content: G'day liitlepea,Withstanding Testers have HV Sockets.https://www.gwinstek.com/en-global/products/layer/Safety_TestersMaybe you could find a spare from the GW models that could be suitable.

author: littlepea
author_rank: Newbie
timestamp: January 21, 2025, 04:46:14 pm
content: thanks but gwinstek's HV connector is not good at all. I call them as "trash". those got copycats from china with nylon or other insulation jack costs $5 per piece on Aliexpress....I am still searching for the pothead those heavy duty connector used for switchgears.

author: joeqsmith
author_rank: Super Contributor
timestamp: January 21, 2025, 05:43:15 pm
content: Have you looked at Kings.

author: littlepea
author_rank: Newbie
timestamp: January 21, 2025, 06:40:53 pm
content: I believe King's stuff was used by Varian vacuum pumps elsewhere, same issue, low power or pulse applications.

author: joeqsmith
author_rank: Super Contributor
timestamp: January 21, 2025, 08:30:41 pm
content: Maybe start with your requirements

author: joeqsmith
author_rank: Super Contributor
timestamp: January 22, 2025, 06:09:20 pm
content: Without any requirements, pure guess work. This is the Kings connector I use in my home made transient generator. 20kV, 25Ahttps://www.newark.com/kings/1765-1/rf-coaxial-20kv-high-volt-plug/dp/17B5453One of our Spellman bench supplies uses what appears to be a UHF connector shell and pin but they extend the coax a few inches. That would be a low cost solution. Maybe have a look at what they are using:https://www.spellmanhv.com/en/Technical-Resources/FAQs/Technology-Terminology/What-is-a-high-voltage-power-supply

author: pertinax
author_rank: Newbie
timestamp: January 22, 2025, 07:46:12 pm
content: I believe the connector in the picture is used in the Doble M4100 tan delta tester:https://www.doble.com/product/m4100/It is a test instrument used to measure the dissipation factor of e.g. bushings, HV-transformer insulation etc. I examined this exact connector many years ago and came to the conclusion that it was custom made. A simple 4 mm banana plug for the HV. And springs wrapped around holes in the receptacle housing for the shield connection. (Yes, the cable is coaxial or perhaps triaxial). The receptacle housing itself being of some type of fiber reinforced composite material (Pertinax?) The cable part of the connector is made from something like POM.This connector would be good for at least 12 kV, the current handling only being dependent on the banana connector and the cable itself. I see that the Doble is specified up to 5 A, but that might be together with a separate resonating inductor.There are more advanced dissipation factor/tan delta testers in the market. They have a triaxial HV cable with an inner guard screen and an outer ground screen, in order to measure isolators which are grounded. And also cover a larger range of frequencies.This type of connector can be fabricated with access to the right materials and a lathe. There is somewhat of an art to terminate the HV cable correctly. The shield needs to be far enough pulled back from the center conductor and some attention needs to be spent on sharp edges etc. which otherwise might cause corona and partial discharge.

author: littlepea
author_rank: Newbie
timestamp: January 23, 2025, 03:19:43 am
content: very helpful. I watched an vid todayand found that the Trek did a simpler design. of coz this is not for 5Amp/2kV(?). The beautiful thing of Trek's system is the design inside and outside. Simple enough, seams like G10 with a center HV connector , for low power (mA level) use. Corona, triple junction, dielectric breakdown cannot be an issue given the shell is class I chassis earthed, portable system is another thing, though.I checked this datasheet and still believed it's an OTS part.https://www.eaton.com/content/dam/eaton/products/medium-voltage-power-distribution-control-systems/cooper-power-series-switchgear/eaton-isg-sd-solid-dielectric-switchgear-government-sales-aid-sa285003en.pdfI will take further look at other systems in next few days.

author: daisizhou
author_rank: Super Contributor
timestamp: January 23, 2025, 03:45:53 am
content: I want to know what your plan is?A high voltage tester I guess?

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: January 23, 2025, 04:37:04 am
content: Hello littlepea,The HV pothead connector seems to be plugged into an (RF) power tube socket.Many of these sockets are coaxial :https://www.surplussales.com/Images/TubeSockets-Accessories/Sockets/tua-3r-sok_3_lg.jpghttps://media.rfparts.com/media/catalog/product/cache/1/small_image/438x438/9df78eab33525d08d6e5fb8d27136e95/s/k/sk300_1.jpghttps://www.picclickimg.com/YsEAAOSwdsVmaZ9Y/Original-Eimac-SK-300A-RF-Power-Tube-Socket-for.webphttps://media.rfparts.com/media/catalog/product/s/k/sk84_2.jpgFor the connector, you may use a suitable defective RF triode.https://www.ebay.fr/str/hfvhfpartsYou need to break the vaccum in the tube.Check with vendor that the part does not contain anyBerylliumoxide. A nasty/harmful matter often used in vintage RF parts.So avoid any grinding or drilling on an RF power part before you are absolutely sure that there's no Beryllium inside.Should you need some Beryllium, the JWST's hexagonal mirrors are of pure Beryllium. If you can catch the telescope^^https://www.youtube.com/watch?v=pVzFaQAZc5M (edit URL to remove space characters)

author: littlepea
author_rank: Newbie
timestamp: January 23, 2025, 04:09:59 pm
content: I found some similar with good quality, probably it's called switch gear termination, dry ....blah blah1. Staublihttps://www.farnell.com/datasheets/1804160.pdf2. Hubbellhttps://www.hubbell.com/hubbellpowersystems/en/products/power-utilities/underground-separable-connectors/deadbreak-accessories/adapters/c/2496270orhttps://www.stagelightingstore.com/Hubbell-HBLFRR-Female-Panel-Mount-Double-Set-Screw-Red?gad_source=1&gclid=Cj0KCQiA7se8BhCAARIsAKnF3rxgNnWQ_2PT9MGuhOc24tfzZGX80mTpDnKN-FDdzd-VGfVh5pBSlIkaAmcyEALw_wcB3. Raychemhttps://www.te.com/content/dam/te-com/documents/energy/global/productdocuments/HV%20Cable%20Accessories/energy-hvca-cat-epp1946-high%20voltage%20cable%20accessories-en.pdfhttps://www.te.com/en/product-CAT-RPIT.datasheet.pdf4.https://www.filkab.com/files/category_files/file_1531_bg.pdf5.https://www.gvk.com.au/pdf/raychem_hv/boots.pdf6. simple connector:https://caton.com/product/high-voltage-connector-17-series/7. 12KV/4.5Ahttps://catalog.connectronicscorp.com/Asset/CCB00107-200805--2-.pdf8. 30A versionhttps://www.hvproducts.de/wp-content/uploads/2021/04/s_series.pdf9. PFisterer XFMR Bushinghttps://catalogue.pfisterer.com/en/827107064/10.https://www.amphenolalden.com/sites/default/files/images/HV_Brochure_R2.pdf11.https://www.surplussales.com/wire-cable/hvwire-2.html

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: January 23, 2025, 06:11:39 pm
content: 1. KBT10BV-AX series from Multi Contact / Staubli are rated 1000 VAC & 1500 VDC. But these are really top notch connectors.2. Hubbell HBLFRR Female Panel Mount : 600 VAC & 250 VDC max4. & 5. These are really high voltage connectors and accesories

author: ahbushnell
author_rank: Frequent Contributor
timestamp: January 24, 2025, 09:27:50 pm
content: Quote from: joeqsmith on January 22, 2025, 06:09:20 pmWe used to use UHF connectors with the shell knocked out. There is corona (depending on the voltage). Are you using DC or AC high voltage. AC and corona will kill cables. DC less so.