Calibrations for resistance welding at high pulsed currents

Author

Djokic, Branislav

Author_Institution

Meas. Sci. & Stand, Nat. Res. Council of Canada, Ottawa, ON, Canada

fYear

2014

fDate

24-29 Aug. 2014

Firstpage

12

Lastpage

13

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on

Conference_Location

Rio de Janeiro

ISSN

0589-1485

Print_ISBN

978-1-4799-5205-2

Type

conf

DOI

10.1109/CPEM.2014.6898234

Filename

6898234