US 12,442,839 B2
Rogowski coil with calibration unit
Vahid Behjat, Toronto (CA); Yufan Wang, Toronto (CA); Ketao Li, Toronto (CA); and Liang Wang, Toronto (CA)
Assigned to Accuenergy (Canada) Inc., (CA)
Filed by Accuenergy (Canada) Inc., Toronto (CA)
Filed on Jul. 27, 2023, as Appl. No. 18/359,875.
Prior Publication US 2025/0035674 A1, Jan. 30, 2025
Int. Cl. G01R 15/18 (2006.01); G01R 19/00 (2006.01); H01F 38/30 (2006.01)
CPC G01R 15/181 (2013.01) [G01R 19/0092 (2013.01); H01F 38/30 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A current measuring device for a primary conductor, the device comprising:
a Rogowski coil configured to generate an output voltage proportionate to the rate of change of a primary current passing through a conductor, the Rogowski coil having two ends separated by an insulating gap of approximately 1.5 mm when closed, each end encased in a plastic fitting; and
a calibration unit operatively linked with the Rogowski coil, the calibration unit including a potentiometer and at least one resistor configured to modify the output voltage based on a predetermined calibration factor, the calibration factor being associated with a coil turn number of the Rogowski coil, the calibration unit designed to modify the output voltage based on a predetermined calibration factor, this factor being associated with a physical attribute of the Rogowski coil.