Electronics > Projects, Designs, and Technical Stuff
DIY / CHeap Rogowski Coil
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Glenn0010:
Hi,

I'm owrking on an automated double pulse tester, where you set the desired pulse test current and through a current sensor, a uC sorts out the pulses automatically.

I've almost finished the code and now have to start looking at which sensor to use. Ideally it would be a rogowski since it has the least delay. Does anyone know of any cheap rgowski or even a decent DIY method? I'm open to other suggestions as well.

Cheers
Gyro:
This thread looks as if it could be helpful as it mentions both double pulse detection and Rogowski Coils... https://www.eevblog.com/forum/projects/double-pulse-testing-project/.

A forum search for 'Rogowski' pulls up quite a lot of hits - I remember at least one person trying to build one.
MagicSmoker:
Making a Rogowski coil is fairly easy; making the output from one usable is relatively difficult. This is because the raw output of a Rogowski coil is proportional to the rate of change of flux through its solenoid coil, so it has to be run through an integrator to produce an output proportional to current that is flat with frequency. Unfortunately, making an integrator that covers a wide frequency range yet exhibits low drift and offset is incredibly difficult. Not impossible, mind you, but much harder than you might expect at first glance (invoking the "How Hard Can It Be" curse here).

Rogowski probes are commonly used for double-pulse testing, but with the caveat that the results should be considered more of relative value, than absolute. The gold standard for high precision, wide-bandwidth current measurement is a Pearson current probe, however. You'll want to be sitting down when check the pricing on them, though they do turn up on eBay from time to time.
Glenn0010:
Luckily we have a few pearsons at work which I can borrow to develop it. And yes Rogowskis can be a bit finniky with their accuracy and offsets.

Oh and yeah, I didn't relize the pearsons were so deer, jesus!
MagicSmoker:
Alright, attached is a paper on PCB Rogowski probe designs that I found useful enough to save. I could've sworn I had a few more, but this was at least a couple desktop computers ago so things apparently got lost along the way.


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