A shunt for real currents - Page 1
Forum section: electronics / general

author: Henrik_V
author_rank: Regular Contributor
timestamp: March 03, 2017, 02:20:30 pm
content: Two pictures of a retirered 10µOhm shunt , 23kA 0.03%to big for my collectionThe small motor stirrs the coolant

author: poorchava
author_rank: Super Contributor
timestamp: March 03, 2017, 02:22:55 pm
content: Pictures don't show, at least for me.

author: Henrik_V
author_rank: Regular Contributor
timestamp: March 03, 2017, 02:53:15 pm
content: different source..

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 03, 2017, 03:05:20 pm
content: Dang, and I just installed a meter on my aluminum smelting pot line!Tim

author: Tom45
author_rank: Frequent Contributor
timestamp: March 03, 2017, 03:09:43 pm
content: QuoteWhy was it retired? What did they replace it with?

author: manganin
author_rank: Regular Contributor
timestamp: March 03, 2017, 08:07:59 pm
content: Quote from: Henrik_V on March 03, 2017, 02:20:30 pmOtto Wolff

author: babysitter
author_rank: Frequent Contributor
timestamp: March 03, 2017, 09:25:42 pm
content: Quote from: Henrik_V on March 03, 2017, 02:20:30 pm... which is possibly some polychlorinated biphenylGreat device, I would take it but only if its certified empty and cleaned.What do you know about its history? Where was it, what kind of company, useage?

author: e61_phil
author_rank: Frequent Contributor
timestamp: March 03, 2017, 09:28:48 pm
content: Quote from: babysitter on March 03, 2017, 09:25:42 pmI would think it is from the PTB

author: Jeroen3
author_rank: Super Contributor
timestamp: March 03, 2017, 09:31:44 pm
content: Probably a shunt for railway since it says "gleichstrom" (DC).

author: Vgkid
author_rank: Super Contributor
timestamp: March 03, 2017, 10:24:17 pm
content: Wow, that is definitely a huge shunt.Quote from: manganin on March 03, 2017, 08:07:59 pmI recognize those binding posts..It is amazing what they were able to make back then, and how stable some of those standards are.

author: Henrik_V
author_rank: Regular Contributor
timestamp: March 03, 2017, 11:10:54 pm
content: Quote from: e61_phil on March 03, 2017, 09:28:48 pmWhere: PTB is rigthBut sorry, no idea about the history ... I'm in the acceleration dep. ...Quote from: manganin on March 03, 2017, 08:07:59 pmWith your nick?Probably yes, I check it next fridayQuote from: babysitter on March 03, 2017, 09:25:42 pmIt's marked to use native naphtha and waterQuote from: Tom45 on March 03, 2017, 03:09:43 pmNo ideaMaybe they changed the connector system ?Just a nice big stone of old metrology, I don't know about the internal contstruction, but if it can take the dI/dt , you can measure the current of a thunderboldWell, (23kA)² x 10µ\$\Omega\$ = 5.29kW ...

author: HighVoltage
author_rank: Super Contributor
timestamp: March 05, 2017, 11:45:38 am
content: Definitely big.I have seen one of these in the Aluminum factory in Hamburg / Germany in the mid 1980sThis plant hat the largest power consumption in Hamburg.And they got the power for (almost) free.

author: Assafl
author_rank: Frequent Contributor
timestamp: March 05, 2017, 12:22:15 pm
content: The shunt that shan't be used - no more. The shunt forever to be shunned - doomed by its own bigly-ness.I guess those two thumbscrews are where you'd connect your Voltcraft DMM?

author: lowimpedance
author_rank: Super Contributor
timestamp: March 06, 2017, 12:25:38 am
content: Quote from: Assafl on March 05, 2017, 12:22:15 pm.......LOL............Quite a few un loved ones stuck under benches around work here too!. Excellent door stops for very big doors.

author: Vgkid
author_rank: Super Contributor
timestamp: March 06, 2017, 03:28:45 am
content: Quote from: lowimpedance on March 06, 2017, 12:25:38 am

author: Henrik_V
author_rank: Regular Contributor
timestamp: March 06, 2017, 08:08:04 am
content: Quote from: Assafl on March 05, 2017, 12:22:15 pmDMM?No, regarding the history a Weston-Element, a compensator and a lightbeam mirror galvanometeror to cite Wildar:

author: Assafl
author_rank: Frequent Contributor
timestamp: March 06, 2017, 11:07:58 am
content: Quote from: Henrik_V on March 06, 2017, 08:08:04 amAh yes - a Weston cell, a potentiometer and a null galvanometer (someone is selling a Guildline lightbeam galvanometer on eBay). I will be candid that until I started reading the metrology forum I never understood why a potentio-meter had "meter" as part of the word. Why not potentiovary or potentiotrol or something like that.Is there a better way than a shunt to measure 23,000 Amps? How do they measure current at power stations? (I am just reading about Fiber Optic Current Sensors for measuring insane levels of DC current - really cool)

author: Codebird
author_rank: Regular Contributor
timestamp: March 06, 2017, 11:32:07 am
content: QuoteThese days, hall effect sensor. Those weren't around back in the Shunt Age, so you got monstrosities like that instead.

author: Jeroen3
author_rank: Super Contributor
timestamp: March 06, 2017, 06:58:29 pm
content: Nothing beats the bandwidth of a shunt.https://www.utwente.nl/en/news/!/2017/3/313543/electronic-energy-meters-false-readings-almost-six-times-higher-than-actual-energy-consumptionQuote from: Codebird on March 06, 2017, 11:32:07 amFor DC I still think shunts are used more. Hall effect sensors are easily offset by magnatic fields. This is why you should avoid LEM sensors at all cost.

author: bji900
author_rank: Contributor
timestamp: March 06, 2017, 07:11:17 pm
content: I would love to see the buss bars that connected this to the system and for that matter the system that it ran!

author: Assafl
author_rank: Frequent Contributor
timestamp: March 06, 2017, 09:22:44 pm
content: I read that Fibre Optic Fiber Sensors are replacing the big Hall Effect sensors. ABB talk about replacing Hall Effect sensors weighing 2 tons.https://library.e.abb.com/public/74d5555d2a9c2998c12579a00038ff0a/FOCS_brochure_3BHS362996_E01.pdfThe Hall effect senor I got from Aliexpress weight a few grams.

author: cncjerry
author_rank: Unknown
timestamp: March 19, 2017, 07:20:52 pm
content: Where can I pick one of these up? It will go nicely with my other boat anchors.