Author Topic: Rogowski current probe  (Read 1800 times)

Offline klugesmith

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Re: Rogowski current probe
« Reply #40 on: October 03, 2020, 10:20:47 PM »
Agreed, 10 mV is not weak as electronic signals go.
What's the noise level at microphone input to a PC audio "card"?  Digitized voltage signal could be low pass filtered, averaged, and (lest we forget) integrated offline.

Just remembered the commercial model 916 fluxmeter box.  It does voltage integration, is plenty fast for 60 Hz, and has offset voltage low enough for "DC" measurement.  Invites Rogowski coil tests on DC buses whose current can be switched on and off.
https://highvoltageforum.net/index.php?topic=819.msg5555#msg5555

This chat has served as reminder that fancy winding (34 AWG magnet wire, wound beautifully, maybe with mechanically controlled pitch) is probably unnecessary for stated objective, DIY flexible coil for a single application.
Would be a briefly engaging squirrel-chase.
« Last Edit: October 03, 2020, 10:36:38 PM by klugesmith »

Offline flyglas

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Re: Rogowski current probe
« Reply #41 on: October 04, 2020, 04:21:24 PM »
Here is a picture of the windings of the Ultra Mini probe: Page 19: https://gmw.com/wp-content/uploads/2019/01/APEC-March-2015.pdf

Offline klugesmith

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Re: Rogowski current probe
« Reply #42 on: October 04, 2020, 06:16:24 PM »
Thanks; the picture of "Old CWTUM" started a very satisfying squirrel chase.


Picture shows 50 turns in 6.1 mm, for winding density of 8200 turns/m (208 turns/inch). Estimated coil diameter is 1.15 mm outside and 0.91 mm inside. The larger red rectangle is 1.7 mm high, matching the Ultra Mini jacket OD.
Using coil mid-diameter, computed sensitivity is 8.55 nH. 
Anybody seen that parameter given in literature from PEM, or other commercial RC maker?

My test of closely-wound AWG34 magnet wire got 5900 turns/m (150 turns/inch).  Can probably get 2100 turns/m with plain old wire-wrap wire.  In a 5.5 mm coil that would give us 63 nH.  On 200 A at 60 Hz, 4.7 mV.
« Last Edit: October 04, 2020, 06:56:21 PM by klugesmith »

Offline flyglas

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Re: Rogowski current probe
« Reply #43 on: October 04, 2020, 07:49:17 PM »
Thanks for image processing and the squirrel chase. I had the same idea but no time today.

I also have done the math (with your values) and calculated the same mutual induction as you.
The mutual induction value is plausible.

With a integrator time constant of 1.7 ┬Ás (R = 1700 Ohm and C = 1.0 nF) we have a sensitivity of around 5 mV/A.

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Re: Rogowski current probe
« Reply #43 on: October 04, 2020, 07:49:17 PM »

 


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