Rogowski Coils

Aim Dynamics offers Rogowski coils (also called rope CTs or flexible current transformers) from several manufacturers. To help you find what you’re looking for, we’ve broken them down into these categories:

AC Amp Input -> 333 mV Output. Rogowski Coils can be configured for this type of output signal by using a Rogowski coil with an integrator. These customizations are available.

AC Amp Input -> 4-20mA Output. These flexible coils output a 4-20mA signal.  Some models are powered by the 4-20mA loop whereas others come with their own external power supply.

AC Amp Input -> 5A Output. As stated above, with an integrator Rogowski coils can be tuned with the use of an externally powered integrator to output a 5A signal.

AC Amp Input -> 0-5Vdc/0-10 Vdc Output. These Rogowski coils transduce the input signal to a 0-5Vdc or 0-10Vdc signal.

Rogowski coils are more versatile than most other types of current transformers. They don’t have a core that can saturate like a standard solid or split-core CT. The lack of core allows them to be used for a much wider range of amperages. Additionally they come in different lengths and widths. This allows them to be installed in some places where a regular solid or split-core CT wouldn’t fit. Often Rogowski coils are sold in sets of three with an integrator as this is ideal for monitoring 3 phase power. On their own, Rogowski coils don’t produce a very powerful voltage signal. The required output signal (333mV, 4-20mA, 0-5Vdc, 0-10Vdc, 100mA, 1A or 5A) can be achieved with an integrator. Some power meter manufacturers can accept the native output of the Rogowski coil passively, whereas less flexible meters require the signal to be amplified and the phase corrected.