Current magazine 1/30 (March 2017)
Universal Current Transformer for Accurate Measurement of Short-circuit Currents
How to citeJ. Przybysz, J. Olak and Z. Piątek, "Universal Current Transformer for Accurate Measurement of Short-circuit Currents," Acta Energetica, vol. 1, no. 30, pp. 101-106, Jan. 2017.
The paper presents the design of a special current transformer developed by the Institute of Power Engineering in cooperation with TRANSFORMEX sp. z o.o. The aim of the project was to obtain current transformers allowing not only a thorough transformation of symmetrical currents – which is characteristic for typical current transformers, but also of asymmetrical shortcircuit currents containing an aperiodic component, which are not reproduced by classic current transformers. A current transformer has been developed with a range of short-circuit currents established from 1 kA to 50 kA, and short-circuit currents with an aperiodic component with a decay time constant up to 200 ms, peak value from 2.5 kA to 125 kA, assuming the possibility of five-fold repetition of short circuits with the same value and the same constant component polarity, with the assumed transformation accuracy.