NDLI: Global monitoring approach in a large autotransformer through PD, DDF and DGA analysis: PD source location and maintenance action planning

Content Provider	IEEE Xplore Digital Library
Author	Tozzi, M. Cavallini, A. Montanari, G.C. Iuliani, V. Serafino, C.
Copyright Year	2011
Description	Author affiliation: Techimp HQ Srl, Zola Predosa, Bologna, Italy (Tozzi, M.) \|\| Terna Spa Roma, Italy (Iuliani, V.; Serafino, C.) \|\| Department of Electrical Engineering, University of Bologna, Bologna, Italy (Cavallini, A.; Montanari, G.C.)
Abstract	Feasibility and effectiveness of a Global Monitoring approach on a 250 MVA autotransformer are illustrated in this paper. The on-line Global Monitoring System (GMS) is constituted by a Partial Discharge Monitoring (PDM) system, a bushings Dielectric Dissipation Factor Monitoring (DDFM) system and a Dissolved Gas Analysis (DGA) on-line monitoring unit. Combining the results obtained from the three systems, it was possible to detect, identify and locate two different PD sources producing a critical level of hydrogen. The first PD activity, ascribable to presence of gas bubbles in the oil, disappeared after oil treatment. The second one, due to wrong constructional arrangement at the winding connections to the bushings, did not extinguish after the oil treatment and started again to produce a large and critical amount of hydrogen. The trend of the PD activity was analyzed for six months, resorting to statistical indexes, such as the amplitude and repetition rate, in order to help the maintenance manager to plan proper actions. This successful example highlights how predictive monitoring systems can reduce the maintenance costs in critical assets as large power transformers, stressing the importance of analyzing various diagnostics marker together in a global monitoring approach [1–3].
Starting Page	206
Ending Page	210
File Size	485293
Page Count	5
File Format	PDF
ISBN	9781457702785
e-ISBN	9781457702792
e-ISBN	9781457702778
DOI	10.1109/EIC.2011.5996147
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Partial discharges Monitoring Oil insulation Insulators Power transformer insulation Sensors asset management Partial Discharges Transformers DDF Tangendelta DGA global monitroing
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

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