U. Mohan Rao
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View article: Titanium dioxide nanoparticles on flexural strength of conventional and injection moulded denture base materials
Titanium dioxide nanoparticles on flexural strength of conventional and injection moulded denture base materials Open
The effect of anatase TiO₂ nanoparticles on the flexural strength of PMMA resins, comparing conventional and injection molding techniques is of interest. A total of 120 acrylic specimens were prepared and divided into control, 0.5% TiO₂, a…
View article: Quantitative Estimation of the Gelling in Thermally Aged Natural Ester Dielectric Liquid
Quantitative Estimation of the Gelling in Thermally Aged Natural Ester Dielectric Liquid Open
One of the major issues with natural ester fluid as transformer insulant is encountered due to the oxidation process, which forms a thin gel layer due to polymerization. This latter can hinder the electrical and heat transfer properties. T…
View article: Bubbling Phenomena in Liquid-Filled Transformers: Background and Assessment
Bubbling Phenomena in Liquid-Filled Transformers: Background and Assessment Open
The degradation of the insulation system in liquid-filled power transformers is a serious concern for electric power utilities. The insulation system’s ageing is accelerated by moisture, acids, oxidation products, and other decay particles…
View article: Natural Esters for Green Transformers: Challenges and Keys for Improved Serviceability
Natural Esters for Green Transformers: Challenges and Keys for Improved Serviceability Open
The service of mineral insulating oils for power transformer insulation and cooling aspects cannot be disavowed. However, the continued use of mineral oils is questionable due to environmental unfriendliness and the divestment from fossil …
View article: Next Generation Insulating Liquids Prepared by the International working Group of IEEE DEIS Technical Committee on Liquid Dielectrics
Next Generation Insulating Liquids Prepared by the International working Group of IEEE DEIS Technical Committee on Liquid Dielectrics Open
International audience
View article: Influence of Ester Liquids on Dielectric Strength of Cellulose Kraft Paper
Influence of Ester Liquids on Dielectric Strength of Cellulose Kraft Paper Open
Generally, impregnation of solid insulation is performed to increase the dielectric strength and reduce the dielectric losses of solid insulants. This increase in dielectric strength depends on the oil’s diffusion and dielectric properties…
View article: Effect of Magnetic Field on Partial Discharge Initiated by Metallic Particle in Thermally Aged Natural Esters Under AC and Harmonic Voltages
Effect of Magnetic Field on Partial Discharge Initiated by Metallic Particle in Thermally Aged Natural Esters Under AC and Harmonic Voltages Open
This paper reports the experimental and theoretical investigations of particle levitation voltage on thermally aged ester fluid, under AC and harmonic AC voltages, in the presence of both electric and magnetic fields (130 mT and 160 mT). T…
View article: Pre-Breakdown and Breakdown Behavior of Synthetic and Natural Ester Liquids under AC Stress
Pre-Breakdown and Breakdown Behavior of Synthetic and Natural Ester Liquids under AC Stress Open
In the last decades, a large focus is being placed on the sustainability and safety of the power transformer spectrum. Ester liquids, which have interesting properties such as high fire point and biodegradability, are gaining needed attrac…
View article: Books in the IEEE Press Series on Power Engineering
Books in the IEEE Press Series on Power Engineering Open
The mission of the IEEE Press Series on Power and Energy Systems is to publish leading-edge books that cover a broad spectrum of current and forward-looking technologies in the fast-moving area of power and energy systems including smart g…
View article: Index
Index Open
a absolute charge sensor (ACS) 101 AC Breakdown Voltage (ACBDV) 20-21 accelerated thermal aging ASTM D1934-95 standard 93 atmosphere 50, 94 electrical stress 52 IEC 60216 standard 49-50 IEC 62332-2 standard 93-94 IEEE Std.C57.100 48-49 moi…
View article: Fullers Earth Treatment for Esters Liquids used in Power Apparatuses: Inferences and Arguments
Fullers Earth Treatment for Esters Liquids used in Power Apparatuses: Inferences and Arguments Open
Insulating Liquids are widely used for their electrical and thermal properties in power apparatuses, particularly at the level of liquid-filled transformers. With the shift in engineering aspects towards sustainable development, it is impo…
View article: Improved Monitoring and Diagnosis of Transformer Solid Insulation Using Pertinent Chemical Indicators
Improved Monitoring and Diagnosis of Transformer Solid Insulation Using Pertinent Chemical Indicators Open
Transformers are generally considered to be the costliest assets in a power network. The lifetime of a transformer is mainly attributable to the condition of its solid insulation, which in turn is measured and described according to the de…
View article: Perspectives of Convertors and Communication Aspects in Automated Vehicles, Part 1: Convertors and Condition Monitoring
Perspectives of Convertors and Communication Aspects in Automated Vehicles, Part 1: Convertors and Condition Monitoring Open
A critical survey has been conducted on high energy-efficient bidirectional converters, various topologies that effectively meet the automated vehicle requirements, and 24 GHz/77 GHz low-profile antennas (for automotive radar applications)…
View article: Perspectives of Convertors and Communication Aspects in Automated Vehicles, Part 2: Printed Antennas and Sensors for Automotive Radars
Perspectives of Convertors and Communication Aspects in Automated Vehicles, Part 2: Printed Antennas and Sensors for Automotive Radars Open
Automated vehicles are becoming popular across the communities of e-transportation across the globe. Hybrid electric vehicles and autonomous vehicles have been subjected to critical research for decades. The research outcomes pertinent to …
View article: A review on pre-breakdown phenomena in ester fluids: Prepared by the international study group of IEEE DEIS liquid dielectrics technical committee
A review on pre-breakdown phenomena in ester fluids: Prepared by the international study group of IEEE DEIS liquid dielectrics technical committee Open
In view of the contemporary scenario and importance of alternative liquid dielectrics, IEEE DEIS Technical Committee on Liquid Dielectrics laid emphasis on pre-breakdown phenomena of ester dielectric fluids. The present article reports the…
View article: Gassing Tendency of Fresh and Aged Mineral Oil and Ester Fluids under Electrical and Thermal Fault Conditions
Gassing Tendency of Fresh and Aged Mineral Oil and Ester Fluids under Electrical and Thermal Fault Conditions Open
Operational factors are known to affect the health of an in-service power transformer and to reduce the capabilities and readiness for energy transmission and distribution. Hence, it is important to understand the degradation rate and corr…
View article: Influence of ageing on oil degradation and gassing tendency under high‐energy electrical discharge faults for mineral oil and synthetic ester
Influence of ageing on oil degradation and gassing tendency under high‐energy electrical discharge faults for mineral oil and synthetic ester Open
In this work, mineral oil and synthetic esters were selected at different ageing factors (based on acidity values). Fresh and aged oils have been subjected to high‐energy discharges (repeated 100 breakdowns) to simulate electric faults of …
View article: Thermal Performance of Nomex-910 and TUK Insulating Papers in Soyabased Natural Ester Oil
Thermal Performance of Nomex-910 and TUK Insulating Papers in Soyabased Natural Ester Oil Open
In this paper, evaluation of Nomex-910 and thermally upgraded Kraft (TUK) paper has been investigated in soya-based natural ester oil by performing accelerated thermal ageing.All the test samples have been prepared in standard oil/paper ra…
View article: Influence of Aging on Oil Degradation and Gassing Tendency for Mineral oil and Synthetic Ester under Low Energy Discharge Electrical Faults
Influence of Aging on Oil Degradation and Gassing Tendency for Mineral oil and Synthetic Ester under Low Energy Discharge Electrical Faults Open
The intent of this work is to understand the influence of low energy discharge electric faults in mineral oil and synthetic esters on liquid degradation and gassing tendency at different aging conditions (based on acidity values). A low en…
View article: On Some Imperative IEEE Standards for Usage of Natural Ester Liquids in Transformers
On Some Imperative IEEE Standards for Usage of Natural Ester Liquids in Transformers Open
From the recent past, biodegradable dielectric fluids are becoming popular across the global utilities for use in oil-filled transformers. To date, several utilities have started using biodegradable insulating fluids for new and retro-fill…
View article: Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology
Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology Open
Oxidation of oil/paper insulation initiates premature aging and introduces carboxylic acids with eventual increase in oil acidity, which hampers the properties of the oil. In this paper, a membrane separation technology-based purification …
View article: Alternative Dielectric Fluids for Transformer Insulation System: Progress, Challenges, and Future Prospects
Alternative Dielectric Fluids for Transformer Insulation System: Progress, Challenges, and Future Prospects Open
Ester-based dielectric fluids have gained widespread popularity for applications in high voltage apparatus. Synthetic and natural esters have been subjected to research for decades vis-à-vis mineral insulating oils around the world. Althou…
View article: Engineering Dielectric Liquid Applications
Engineering Dielectric Liquid Applications Open
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View article: Characterization of Mineral oil Based Fe3O4 Nanofluid for Application in Oil Filled Transformers
Characterization of Mineral oil Based Fe3O4 Nanofluid for Application in Oil Filled Transformers Open
In this paper, magnetite (Fe3O4) nanoparticles based nanofluid has been synthesized and characterized for application in oil filled transformers.The intent of this work is to check the feasibility of magnetite based nanofluid through appro…
View article: Subtractive Clustering Fuzzy Expert System for Engineering Applications
Subtractive Clustering Fuzzy Expert System for Engineering Applications Open
Performance of a fuzzy expert system is related with how good the membership functions are normalized, tuned for a problem statement and correlation of antecedents and consequents. This paper helps in tuning and designing the membership fu…