NDLI: A realistic reliability and availability prediction methodology for power supply systems

Content Provider	IEEE Xplore Digital Library
Author	Kervarrec, G. Marquet, D.
Copyright Year	2002
Description	Author affiliation: France Telecom R&D, Lannion, France (Kervarrec, G.; Marquet, D.)
Abstract	Predictive reliability and availability calculations of power supply systems are generally too optimistic compared to values observed in the field. This is mainly due to lack of data for subset, and use of inappropriate reliability blocks diagrams (RBD). France Telecom R&D has tried to improve the methodology. Battery and public mains interrupt statistics have been studied, and then RBDs for equipment and energy chain are proposed to reach predictive reliability and unavailability values. First of all, a precise battery reliability model that fits field data is necessary. On the basis of recent studies and field failures observations made by France Telecom, a VRLA batteries string reliability model has been developed, taking into account: life time related to temperature of the cells; maintenance strategy of the strings; failures modes (including capacity loss, cell short circuits, open circuit equivalent to high impedance); and finally string failure criterion relative to mains power interrupt and power supply failures durations. In a second step, quality of the French electricity supplier is studied for high voltage (HTA). Failure rates and mean time to repair (MTTR) for very short, short and long power outages are analysed. Lognormal distributions laws are established for various kinds of built-up areas (Parisian area, 100,000 residents, 10,000 to 100,000 residents, less than 10,000 residents). Failure rates of the power supply chain equipment are then studied. MTTRs lognormal distributions of equipments placed in front of batteries are proposed, taking into account travel delay and repair time. At last, RBDs are proposed for usual 48 V DC architectures, allowing global predictive reliability and availability calculation for several autonomy batteries values.
Sponsorship	Power Electron. Soc. IEEE
Starting Page	279
Ending Page	286
File Size	419711
Page Count	8
File Format	PDF
ISBN	0780375122
DOI	10.1109/INTLEC.2002.1048669
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-09-29
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power system reliability Availability Power supplies Batteries Telecommunications Circuits Research and development Statistics Temperature Maintenance
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in