NDLI: Transformer oil reclamation by combining several strategies enhanced by the use of four adsorbents

Content Provider	IET Digital Library
Author	Safiddine, L. Zafour, Amel Hadj Ziane Fofana, Issouf Skender, Abdelhak Guerbas, Fettouma Boucherit, Ahmed
Abstract	From an environmental perspective, petroleum-based aged oils removed from power transformers are source of several pollutants and therefore cannot be disposed of without due care. The degradation of oil in in-service transformers is due to various factors concurrent with the operation of the units over several years. The present study proposes a new strategy to rejuvenate used mineral oils by combining centrifugation, dehydration and sorption with four different adsorbents: activated carbon (ACH), silica gel (SG), magnesium oxide (MO) and activated bentonite (AB). The process of regeneration proposed in this study resulted in a level of restoration that saw the used oil take on the characteristics of new oil (colour, dissipation factor, resistivity, permittivity, acid number). The results also showed that the optimum form of the re-refined base oil can be attributed to a 10% (w/w) quaternary mixture of the adsorbents, itself comprised of 1% ACH, 6% SG, 1% MO and 2% AB. The anticipated benefits are reduced risk of dielectric breakdown blamed for over 75% of extra high-voltage (EHV) power transformer failures and extended transformer life expectancy by retarding the solid insulation aging processes.
Starting Page	2912
Ending Page	2920
Page Count	9
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 11, Aug (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.1995
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-06-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Activated Bentonite Activated Carbon Adsorbents Centrifugation Dehydration Dielectric Breakdown Dissociation Extended Transformer Life Expectancy Gels High-voltage Power Transformer Failure In-service Transformer Magnesium Oxide Manganese Compound Mineral Oils Minerals MnO Organic Insulation Petroleum-based Aged Oils Pollutants Power Transformer Insulation Regeneration Process Silica Gel Solid Insulation Aging Processes Sorption Transformer And Reactors Transformer Oil Transformer Oil Reclamation
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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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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