Title :
A current transformer test set for the audio frequency range
Author :
Mohns, E. ; Yue, C. ; Zhou, F. ; Möhring, T. ; Schmidt, M.
Author_Institution :
Phys.-Tech. Bundesanstalt (PTB), Braunschweig, Germany
Abstract :
This paper describes the setup of a test set for current transformer (CTTS) calibrations using a two-channel voltage ratio measurement method. A wideband two-channel digitizer and a differential analogue front-end are used as the heart of the ratio measurement system. The front-end suppresses some static errors of the digitizer and is tested for the frequency range up to 200 kHz. Various active or passive shunts adapt the secondary output current to the ± 2 V or ± 10 V input range of the ratio measurement system. Furthermore, the system is used to set up future measurement systems for efficiency measurements in the frame of current European Metrology Programmes (EMRP).
Keywords :
current transformers; differential amplifiers; measurement errors; voltage measurement; European Metrology Programmes; audio frequency range; current transformer test set; differential analogue front-end; efficiency measurements; frequency 200 kHz; secondary output current; static errors; two-channel voltage ratio measurement method; wideband two-channel digitizer; Current measurement; Current transformers; Europe; Frequency measurement; Measurement uncertainty; Voltage measurement; Wideband; bridge; current transformers; differential amplifiers; voltage ratio;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4673-0439-9
DOI :
10.1109/CPEM.2012.6250922