Planning on using a CT that doesn’t fall into one of 3 ranges for the RIO EMU (Opto 22 groov energy monitoring products can support CTs with a 5 A, 1.0 VAC, or 0.333 VAC secondary.).
RCT24-5000. Looks to be 24mV per 1000A. Primary is 25A to 6000A. Which should output on the secondary 0mV to 144mv.
Looking at the settings I would need to do some adjustments to how this is scaled.
Hopefully not a dumb question. First time using an EMU.
Is it recommended to use a CT that matches one of the 3 range options?
Not a dumb question at all.
The real question is do you have a known good clamp meter you can put on the same feed so that you can just tweak the EMU settings to get them to match?
The other fun question is if your CT output will be linear?
In short, throw it on and make it match reality by tweaking the scaling.
So the next question. We have not bought these CTs. Is it worth recommending a different one?
I have not used the CTs the customer wants. I assume linear.
For scaling, it looks like I can set the max value. CT Rated Current. I would need to calculate that. The highest value for the CT looks to be 0.144V. So when I set the EMU to 0-0.333V, the max won’t be 6000A but something higher.
Ah, my bad, I somehow assumed that you already had these CT’s or they were already installed.
If you are looking at a clean sheet, I’d for sure select 0.333 CTs with the primary current to match your load.
They will be much more accurate and far quicker to setup and no faffing about with the scaling to try and hope you can get something close.
Gotcha. The page I linked to has our overview to help selecting them.
The option is there to get them from us or our friends over at Current Transformer Products | CCS - Current Transformer Manufacturers
Pick something with a 0.333vAC output and you will be up and running very smoothly.
