PRiME operates on the basic Rogowski principle, where a coil is magnetically coupled with the flux created by the current to be measured. A voltage signal is induced into the coil proportional to the flux derivative and thus proportional to the derivative of the current to be measured. Originally, the Rogowski principle was based on a wound coil. Due to the manufacturing tolerance of wound coil, the accuracy is affected by the position of the primary cable in the aperture and also to the external field created (adjacent cables).
PRiME avoids this phenomenon by using two parts for the transducer head, a number of sensor printed circuit boards (PCBs), and a base-PCB. The sensor PCB consists of two separate air cored coils constructed on a multi-layer PCB. Several sensors are mounted onto the base-PCB, at right angles to it, and connected in series to form two concentric loops (inner and outer loops).
The current carrying conductor needs to be positioned within the aperture of the transducer head. This creates an AC magnetic flux, which is coupled into the sensors and induces a voltage proportional to the rate of change of the current (di/dt) (Vinner & Vouter).
Finally, since the collected signal is proportional to the current derivative, it is necessary to integrate the induced voltage in the transducer head to obtain both amplitude and phase information for the current being measured.
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