EEVblog Electronics Community Forum
Electronics => Metrology => Topic started by: Henrik_V on March 03, 2017, 02:20:30 pm
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Two pictures of a retirered 10µOhm shunt , 23kA 0.03%
(https://ni.i.lithium.com/t5/image/serverpage/image-id/197474i84D7BDB9E124750A/image-size/original?v=1.0&px=-1)
(https://ni.i.lithium.com/t5/image/serverpage/image-id/197475i634FD25EFFC8F8DE/image-size/original?v=1.0&px=-1)
to big for my collection :'(
The small motor stirrs the coolant
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Pictures don't show, at least for me.
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different source..
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Dang, and I just installed a meter on my aluminum smelting pot line!
Tim
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Two pictures of a retired 10µOhm shunt , 23kA 0.03%
Why was it retired? What did they replace it with?
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Two pictures of a retirered 10µOhm shunt , 23kA 0.03%
Otto Wolff
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The small motor stirrs the coolant
... which is possibly some polychlorinated biphenyl
Great 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?
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Where was it, what kind of company, useage?
I would think it is from the PTB :)
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Probably a shunt for railway since it says "gleichstrom" (DC).
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Wow, that is definitely a huge shunt.
Otto Wolff
I recognize those binding posts..
It is amazing what they were able to make back then, and how stable some of those standards are.
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Where was it, what kind of company, useage?
I would think it is from the PTB :)
Where: PTB is rigth :)
But sorry, no idea about the history ... I'm in the acceleration dep. ...
Otto Wolff
With your nick? :) Probably yes, I check it next friday :D
The small motor stirrs the coolant
... which is possibly some polychlorinated biphenyl
It's marked to use native naphtha and water
Why was it retired? What did they replace it with?
No idea :) Maybe they changed the connector system ? :D
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 thunderbold 8) ;D ;D
Well, (23kA)² x 10µ\$\Omega\$ = 5.29kW ...
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Definitely big.
I have seen one of these in the Aluminum factory in Hamburg / Germany in the mid 1980s
This plant hat the largest power consumption in Hamburg.
And they got the power for (almost) free.
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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?
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I guess those two thumbscrews are where you'd connect your Voltcraft DMM?
.......LOL............
Quite a few un loved ones stuck under benches around work here too!. Excellent door stops for very big doors :D.
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Quite a few un loved ones stuck under benches around work here too!. Excellent door stops for very big doors :D.
:(
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I guess those two thumbscrews are where you'd connect your Voltcraft DMM?
DMM?
No, regarding the history a Weston-Element, a compensator and a lightbeam mirror galvanometer ;D
or to cite Wildar:
(https://1.bp.blogspot.com/-pKYggPmKriw/VqBKCcRtMOI/AAAAAAAAFGk/htzQEOEOj4k/s1600/bob_widlar_digital1.jpg)
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I guess those two thumbscrews are where you'd connect your Voltcraft DMM?
DMM?
No, regarding the history a Weston-Element, a compensator and a lightbeam mirror galvanometer ;D
Ah 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)
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Is there a better way than a shunt to measure 23,000 Amps?
These days, hall effect sensor. Those weren't around back in the Shunt Age, so you got monstrosities like that instead.
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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-consumption (https://www.utwente.nl/en/news/!/2017/3/313543/electronic-energy-meters-false-readings-almost-six-times-higher-than-actual-energy-consumption)
Is there a better way than a shunt to measure 23,000 Amps?
These days, hall effect sensor. Those weren't around back in the Shunt Age, so you got monstrosities like that instead.
For 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.
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I would love to see the buss bars that connected this to the system and for that matter the system that it ran!
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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.pdf
The Hall effect senor I got from Aliexpress weight a few grams.
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Where can I pick one of these up? It will go nicely with my other boat anchors.