Review
Energy & Fuels
Arputhasamy Joseph Amalanathan, Ramanujam Sarathi, Maciej Zdanowski, Ravikrishnan Vinu, Zbigniew Nadolny
Summary: This paper reviews the gassing tendency of different insulating fluids in transformers and provides precautionary measures for fault diagnosis. Experimental techniques for identifying gassing due to electrical and thermal stress, as well as stray gassing phenomenon, are explained. Interpretation schemes based on historical data of mineral oil may lead to unexpected errors for alternative fluids. Mineral oil and natural ester have positive gassing tendency, while synthetic ester exhibits negative gassing tendency. Stray gases are mostly caused by C-C bond breakage at normal operating temperature. Hydrogen and ethylene are predominantly formed at lower temperatures. Silicone oil and ester fluids are more stable and produce less gassing compared to mineral oil under simulated hot spots. Additives, oxygen, and water content in insulating fluids can confuse the identification of actual faults. Regeneration of insulating fluids using adsorbents reduces gassing tendency depending on the number of cycles.
Article
Engineering, Electrical & Electronic
Teresa Buchacz, Jerzy Buchacz, Michel Duval
Summary: This article discusses the generation of gases in insulating oils at low temperatures, and how to distinguish this phenomenon from other potential faults. By comparing gas generation patterns in the laboratory and real transformers, the temperature range of possible defects can be evaluated.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Engineering, Electrical & Electronic
Anu Kumar Das
Summary: This paper describes the analysis of experimental results on two types of vegetable oil, namely refined coconut oil and commercial vegetable oil derived from soybean oil seeds, to understand the effect of residual mineral oil on the AC breakdown strength of vegetable oil. It is found that refined coconut oil has similar AC breakdown voltage distribution to commercial vegetable oil, indicating its equivalent or even better performance under aged conditions or when mixed with mineral oil.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Abderrahmane Beroual, Hocine Khelifa, Usama Khaled
Summary: This study compared the electrostatic charging tendency of a synthetic oil and a mineral oil, finding that at low rotating speeds, the two oils had similar ECT values. However, at higher speeds, the synthetic oil exhibited a higher ECT than the mineral oil, with the difference increasing with rotating speed and pressboard thickness. Despite this difference, the synthetic oil could still be considered for use in power transformers if other criteria are met.
ELECTRICAL ENGINEERING
(2022)
Article
Automation & Control Systems
Leonardo Roberto da Silva, Francisco Vieira dos Santos, Helane Lucia Oliveira de Morais, Claudinei Rezende Calado
Summary: This study evaluated the use of vegetable oils as cutting fluids in grinding AISI 4340 steel, showing that they have good physicochemical properties, thermal stability, and can replace mineral cutting fluids. The results indicated that vegetable oils are a promising alternative due to their biodegradability, non-toxicity, and cost-effectiveness.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Energy & Fuels
Stephanie Azlyn Anak Felix, Muhamad Faiz Md Din, Asnor Mazuan Ishak, Jianli Wang, Nurul Hayati Idris, Wan Fathul Hakim Wan Zamri
Summary: This paper discusses an experimental study on the effects of doping carbon nanotube particles and magnetic fields on the electrical properties of mineral oil. The results show that adding a proper amount of carbon nanotubes and a suitable magnetic field can improve the performance of transformers.
Article
Physics, Fluids & Plasmas
Allen Andersen, Wousik Kim, J. R. Dennison, Brian Wood, Todd A. Schneider, Jason Vaughn, Kenneth H. Wright, Nelson W. Green, Eric Suh, Joel Schwartz, Abdul-Majeed Azad
Summary: This article discusses the growing challenge of spacecraft charging assessments caused by composite materials. It reviews recent lessons learned from charging tests using both parallel-plate and electron beam geometries. The article also highlights examples of materials with significant variations between samples despite having the same trade name.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)
Article
Engineering, Mechanical
Yu Su, Zepeng Chu, Le Gong, Bin Wang, Zhiqiang Liu
Summary: The lubrication and machining performance of nanofluid composite electrostatic spraying (NCES) with different types of vegetable oils as base fluids were compared and evaluated. The results showed that NCES with LB2000 as the base fluid of external fluid significantly reduced friction coefficient and wear loss, and exhibited better milling performance.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2023)
Article
Automation & Control Systems
Ajumon Somasekharan Pillai, Arul Linsely
Summary: This study examined the breakdown strength and dielectric properties of four different insulating oils, including the effects of aging and the presence of copper catalyst. The results indicate that aging with copper can alter the dielectric properties of oils.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Biochemical Research Methods
Melanie Wagner, Claudia Oellig
Summary: A new method called silver ion-planar solid phase extraction (Ag-pSPE) was developed to address the interference of native terpenes in the analysis of mineral oil aromatic hydrocarbons (MOAH) in vegetable oils. Good repeatability and recoveries were achieved for MOAH analysis after saponification, while a simple solid phase extraction (SPE) clean-up with aluminum oxide was used for MOSH analysis before Ag-pSPE. The method showed satisfactory results and limits for MOSH and MOAH, demonstrating the effectiveness of the Ag-pSPE method.
JOURNAL OF CHROMATOGRAPHY A
(2022)
Article
Nutrition & Dietetics
Zhijuan Meng, Sufang Fan, Xiaoxuan Yuan, Qiang Li, Yunxia Huang, Lisha Niu, Guohua Shi, Yan Zhang
Summary: A method for simultaneous determination of 22 polycyclic aromatic hydrocarbons (PAHs) residues in vegetable oils has been established, which is simple, sensitive and suitable for rapid screening and confirmation.
FRONTIERS IN NUTRITION
(2022)
Article
Engineering, Electrical & Electronic
Jelena Jankovic, Jelena Lukic, Jelena Planojevic, Dejan Kolarski, Djordje Janackovic
Summary: The presence of corrosive sulfur in the oil increases the risks of power transformer failures. A highly selective adsorbent (HSA) is synthesized to remove corrosive sulfur compounds from the oil, and successfully applied in lab-scale, pilot-scale, and on-site oil treatment systems.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Physics, Fluids & Plasmas
B. Chakraborty, S. Maur, A. K. Pradhan, B. Chatterjee, S. Dalai
Summary: This article presents an experimental study on the influence of titania and alumina nanoparticles on mineral and vegetable oils, showing that dispersing nanoparticles can enhance AC breakdown voltage.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Aleksey A. Ignatyev, Pavel B. Razgovorov, Roman S. Nagornov, Natalya A. Politaeva, Liliya R. Mukhametova, Svetlana B. Ilyashenko
Summary: This paper discusses the mineral compositions and prospects for processing natural clays into composite aluminosilicate materials suitable for sorbing substances in vegetable oils. The results show that modifying additives such as oxalic and succinic acids and sodium carbonate can create new acid centers on the surface of the materials. The changes in surface states correlate with the affinity of active sites towards fatty acids, peroxide compounds, carotenoids, and chlorophylls in vegetable oils, and these findings have practical value for medical chemistry. Additionally, impurities in the raw materials can reduce the effectiveness of extracting dyes from vegetable oils.
Article
Energy & Fuels
Maciej Zdanowski
Summary: This paper presents research results on the use of fullerene C-60 to reduce the phenomenon of streaming electrification generated by liquid dielectrics. The influence of flow velocity and C-60 concentration on the electrification of different liquids was analyzed, and the optimal concentration of C-60 resulting in the highest reduction of the electrification phenomenon was identified.
