Calibrating Sensors to Measure Braking Chopper Currents in DC Traction Units

A large part of the energy involved in the braking stage of conventional DC railway traction units is dissipated in rheostat resistors, which is controlled by means of a braking chopper. A setup was developed to calibrate transducers used to measure the resulting high-current chopped DC current sign...

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Bibliographic Details
Published in2020 Conference on Precision Electromagnetic Measurements (CPEM) pp. 1 - 2
Main Authors van den Brom, Helko, van Leeuwen, Ronald
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2020
Subjects
Choppers (circuits)
Current measurement
Distortion measurement
measurement standards
measurement techniques
precision measurements
Rail transportation
Shunts (electrical)
Transducers
Voltage measurement
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Summary:A large part of the energy involved in the braking stage of conventional DC railway traction units is dissipated in rheostat resistors, which is controlled by means of a braking chopper. A setup was developed to calibrate transducers used to measure the resulting high-current chopped DC current signals under conditions mimicking the real application. Preliminary results indicate that the reference transducer used in this setup can accurately measure chopped signals with magnitudes up to at least 250 A and pulse repetition rates up to 500 Hz with uncertainties better than 0.01 %.
ISSN:2160-0171
DOI:10.1109/CPEM49742.2020.9191822