Rogowski Coils

You could have googled Rogowski coil and found this yourself. Why didn't you?

http://en.wikipedia.org/wiki/Rogowski_coil

What size, what voltage, what application, what lead time, what quantity, what country?

<sigh>

Try ANY local or preferred coil manufacturer (Rogowski is a type of coil winding configuration after all). Do it URGENTLY as they will likely need time to design and build your required coil.

Do you know enough to ask specifically for what you want the coil manufacturer to build you? If you just ask for a "rogowski coil" they are going to ask the same questions I have just asked and more, then tell you to go away and create a specification for them to build.

You can also look for companies that offer what are called "flexible current probes", the name given to them when you are going to use them on portable metering devices. Here is my favorite, they actually manufacture most of the ones sold by their competitors under brand-label agreements. AEMC

Keep in mind that a Rogowski Coil needs a circuit integrator to interpret the mV signals, unlike a CT that just provides a proportional current value.