Title :
AMR current sensors for evaluating the integrity of concentric neutrals in in-service underground power distribution cables
Author :
Seidel, Michael ; Krishnan, Kanna ; Paprotny, Igor ; White, Richard ; Evans, James
Author_Institution :
Dept. of Mech. Eng., Univ. of California, Berkeley, CA, USA
Abstract :
In this paper, we present a new method to diagnose the integrity of concentric neutral wires in underground power distribution cables. This method uses a commercially available 3-axis anisotropic magnetoresistive (AMR) magnetic field sensor chip. The AMR sensor is passed once along the energized cable axially, and the cable´s 3-axis magnetic field is plotted as a function of position over the cable. Peaks corresponding to the individual concentric neutral currents are observed, and can be analyzed to diagnose breaks in concentric neutrals due to total corrosion or other means.
Keywords :
electric current measurement; enhanced magnetoresistance; magnetic sensors; underground cables; underground distribution systems; 3-axis anisotropic magnetoresistive magnetic field sensor chip; AMR current sensors; cable diagnostics; concentric neutral wires; concentric neutrals; in-service underground power distribution cables; Actuators; Anisotropic magnetoresistance; Conductors; Magnetic sensors; Mathematical model; Mechanical sensors; Power distribution; Testing; Underground power cables; Wires; AMR sensors; cable diagnostics; concentric neutrals; in service; magnetic current sensing; underground power distribution cables;
Conference_Titel :
Electrical Insulation (ISEI), Conference Record of the 2010 IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-6298-8
DOI :
10.1109/ELINSL.2010.5549822
