A novel technology improving the response of the DCCT for lower sensed power

摘要

Current sensors using magnetic cores (i.e. DC current transformers, DCCTs) covering wide ranges of frequency (from DC to HF) and of sensed current magnitude (from several 10 A to several 10 A) are reviewed. The wave distortion which is often experienced in the output of DCCTs of small current ratings or low power ratings is analyzed. A novel method of eliminating the wave distortion using a compensating winding and HF filters is introduced. Remarkable (10 – 10) times improvement of the frequency response without increasing the exciting frequency of the DCCT is verified, which promises the expansion of DCCT application fields.