NDLI: Magnetic probing of concentric neutrals in energized underground power distribution cables

Content Provider	IEEE Xplore Digital Library
Author	Paprotny, I. Seidel, M. Morris, C. Czamanski, T.N. White, R.M. Wright, P.K.
Copyright Year	2012
Description	Author affiliation: Berkeley Sensor & Actuator Center, University of California, 94720, USA (Paprotny, I.; Czamanski, T.N.) \|\| Dept. of Mechanical Engineering, University of California, Berkeley, 94720, USA (Seidel, M.; Morris, C.; White, R.M.; Wright, P.K.)
Abstract	In this paper, we present the design of prototypes and experimental results from implementing these prototypes to demonstrate a novel online diagnostic technique for probing the integrity of concentric neutral wires (CNs) in underground power distribution cables. Our technique uses anisotropic magneto-resistive (AMR) magnetic sensors that rotate around the circumference of the cable and record the corresponding emanating magnetic field. This magnetic field is a function of the currents passing through the CNs (as well as the central conductor, CC), and can be used to detect signatures of damaged (non-conductive) CNs. We describe the implementation of the prototypes, including the radios that ensure electrical isolation between the data repository (a laptop computer), and the energized cable. We further show experimental results from applying the prototypes to detect fabricated faults on cables in our lab underground cable test-bed under various CN current conditions. The results show that we can detect breaks in CNs in with 1 ARMS return-current per CN, and at least up to 95 feet from the failure side (the maximum length of the cables in our test-bed).
Starting Page	381
Ending Page	385
File Size	2135790
Page Count	5
File Format	PDF
ISBN	9781467304887
ISSN	1089084X
e-ISBN	9781467304870
e-ISBN	9781467304863
DOI	10.1109/ELINSL.2012.6251494
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power cables Saturation magnetization Power distribution Cable shielding Perpendicular magnetic anisotropy Fixtures magnetic current sensing concentric neutrals underground power distribution cables cable diagnostics online
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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AMR current sensors for evaluating the integrity of concentric neutrals in in-service underground power distribution cables

RF transmission-line methods for in-service probing of concentric neutral wires in underground power distribution cables

High saturation magnetic alloy with a rectangular hysteresis loop

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A DEVELOPMENT OF IMPROVED UNDERGROUND DISTRIBUTION POWER CABLES

Worldwide underground distribution cable practices

Influence of phase order on losses and outer magnetic field of grouped underground cables

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Magnetic probing of concentric neutrals in energized underground power distribution cables

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