DocumentCode :
1766293
Title :
High Performance Current Sensor Utilizing Pulse Magneto-Impedance in Co-Based Amorphous Wires
Author :
Fisher, Brett ; Panina, Larissa V. ; Fry, Nick ; Mapps, Desmond J.
Author_Institution :
Sch. of Comput. & Math., Univ. of Plymouth, Plymouth, UK
Volume :
49
Issue :
1
fYear :
2013
fDate :
Jan. 2013
Firstpage :
89
Lastpage :
92
Abstract :
A pulse magneto-impedance noncontact sensor, was developed to detect small currents and subsequently the leakage current between two current carrying conductors. The sensing element is composed of Co-Fe-Mo-Si-B glass coated amorphous wire, placed between two μ-metal washers, which allows a simple differential arrangement, due to field symmetry and shielding against environment fields. High frequency excitation was realized by subjecting the wire to a sharp pulsed current provided by a micro-controller. The use of a micro-controller to drive the sensor allows an efficient and programmable way to establish optimal excitation parameters (pulse duration and periodicity) for high sensitivity of small magnetic field detection. There is also a potential of further improvements due to real-time digital filtering, data manipulation and the provision of a closed loop system. In an experiment simulating the leakage current, a resolution of less than 1 mA for a carrier current of few amperes was achieved, which is well below typical fault current levels of about 10 mA.
Keywords :
amorphous magnetic materials; boron alloys; closed loop systems; cobalt alloys; electric current measurement; iron alloys; leakage currents; magnetic sensors; magnetoresistive devices; microcontrollers; molybdenum alloys; silicon alloys; μ-metal washers; Co-Fe-Mo-Si-B glass coated amorphous wire; Co-based amorphous wires; CoFeMoSiB; carrier current; closed loop system; current carrying conductors; data manipulation; differential arrangement; digital filtering; environment fields; fault current levels; field symmetry; high frequency excitation; high performance current sensor; leakage current; magnetic field detection sensitivity; microcontroller; optimal excitation parameters; pulse magnetoimpedance noncontact sensor; sensing element; sharp pulsed current; Amorphous magnetic materials; Conductors; Leakage current; Magnetic noise; Magnetic shielding; Sensitivity; Wires; Glass-coated wire; leakage current detection; pulse excitation by microprocessor; pulse magneto-impedance;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2012.2220958
Filename :
6392367
Link To Document :
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