The magazine ACTA Energetica has published the article entitled Universal current transformer for accurate measurement of short-circuit currents written by prof. Jerzy Przybysz, IEn's Electric Division, Jan Olak, TRANSFORMEX, and nZbigniew Piątek, IEn's Distribution Equipment Laboratory.
The magazine ACTA Energetica has published the article entitled Universal current transformer for accurate measurement of short-circuit currents written by prof. Jerzy Przybysz, IEn's Electric Division, Jan Olak, TRANSFORMEX, and nZbigniew Piątek, IEn's Distribution Equipment Laboratory.
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.
Przybysz J., Olak J., Piątek Z., Universal current transformer for accurate measurement of short-circuit currents, ACTA Energetica, Quarterly, 1/30, 2017, 101 - 106