NDLI: A Method for Online Diagnostics of Electromagnetic Relays Against Contact Welding for Safety Critical Applications

Content Provider	IEEE Xplore Digital Library
Author	Sravanthi, S. Dheenadhayalan, R. Sakthivel, M.P. Devan, K. Madhusoodanan, K.
Copyright Year	2011
Abstract	In a nuclear power plant, electromagnetic (EM) relays are often used to communicate TRIP signal configured in fail-safe mode. Online diagnostics is an important part of fault tolerant design. Relay contact welding is a failure mode of concern. Current methods do not allow for reliable online diagnostics of this failure mode without actually opening/closing the relays or without making measurements at contact side. In this paper, a technique for online diagnostics of EM relay without affecting the contact status is proposed. The method uses the differences in characteristic decay of coil current during deenergization process between a healthy and a relay whose contacts got welded. A test circuit is designed to verify the concept of deenergizing, followed by quick reenergization of relay coil. Diagnostic information is extracted, and the method is amenable for online automated execution. Results are satisfactory, and a welded contact is successfully detected and indicated by the circuitry. Reliability improvement achieved by deploying the proposed method is highlighted.
Starting Page	1734
Ending Page	1739
Page Count	6
File Size	1655321
File Format	PDF
ISSN	21563950
Volume Number	5
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays Welding Reliability Testing Safety Fault tolerant systems Resistors test interval. Contact welding online diagnostics relay reliability test interval
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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