Title :
Calibrations for resistance welding at high pulsed currents
Author :
Djokic, Branislav
Author_Institution :
Meas. Sci. & Stand, Nat. Res. Council of Canada, Ottawa, ON, Canada
Abstract :
Rogowski coils are widely used as high pulsed current sensors in resistance welding. Their operating conditions reflect on requirements for their calibration. A new calibration system has been developed at NRC Canada for calibrating current sensing coils and weld current monitors for AC resistance welding. The calibration system, which includes a high current source and a coaxial copper cage, has been evaluated at peak pulsed currents of up to 80 kA, at 60 Hz. The best expanded measurement uncertainties (k=2) have been estimated to be within 250 μA/A for magnitude and 175 μrad for phase.
Keywords :
calibration; coils; constant current sources; electric current measurement; electric resistance measurement; electric sensing devices; measurement uncertainty; phase estimation; resistance welding; AC resistance welding; NRC Canada; Rogowski coil; calibration system; coaxial copper cage; current source; frequency 60 Hz; high pulsed current sensor coil; measurement uncertainty; weld current monitoring; Calibration; Coils; Current measurement; Measurement uncertainty; Monitoring; Resistance; Welding; AC current measurement; Rogowski coils; calibrations; digital sampling; measurement uncertainty; pulsed currents; weld current monitors/meters;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4799-5205-2
DOI :
10.1109/CPEM.2014.6898234
