Article
Green & Sustainable Science & Technology
Noor Khairin Mohd, Lim Wen-Huei, Noor Armylisa's Abu Hassan, Yeong Shoot-Kian
Summary: This study found that palm oil and its products have the potential to serve as coolants in oil-immersed transformers, and may be safer compared to mineral oil. The physico-chemical and electrical properties of the studied oils were affected by factors such as hydrocarbon chain type, length, and molecular size.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2021)
Review
Green & Sustainable Science & Technology
Zijia Shen, Feipeng Wang, Zhiqing Wang, Jian Li
Summary: As mineral oil faces challenges in environmental friendliness and operational efficiency, the demand for plant-based insulating fluids as a renewable and biodegradable alternative has been increasing. With over 20 years of field experience, plant-based oils have been proven to be both cost-effective and safer than mineral oil for transformers.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
Hanbo Zheng, Xufan Li, Yongji Feng, Hang Yang, Weijie Lv
Summary: This study simulated the pyrolysis process of palm oil and found that the number of hydrogen bonds gradually increased with the increase of pyrolysis time and temperature, which revealed the reasons behind the prolonged lifespan of insulating paper immersed with natural esters and the slow reduction of breakdown voltage in actual experiments.
Article
Green & Sustainable Science & Technology
Jinshan Qin, Xiao Peng, Qinpan Qiu, Chao Tang
Summary: This paper investigates the mechanism of improving the properties of natural ester insulating oil by modifying it with nano hexagonal boron nitride grafted with silane coupling agent (APTES-hBN). Experimental results show that the addition of Nano APTES-hBN inhibits acid production and reduces the number of polar molecules in the oil. Mechanism study reveals that the addition of Nano APTES-hBN enhances the interfacial bonding between oil and paper insulation, and has strong adsorption capacity.
Article
Chemistry, Physical
Zaid B. Siddique, Soumen Basu, Prasenjit Basak
Summary: This paper focuses on studying the dielectric behavior of a mixture of natural ester oil and mineral oil blend dispersed with TiO2 and ZnO nanoparticles. The results show an overall enhancement in the dielectric properties of nanofluids, with improved breakdown voltage compared to pure mineral oil, pure ester oil, and the oil-blend. These nanofluids can be used as insulating oils in transformers, offering better cooling performance as well.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Review
Green & Sustainable Science & Technology
Mehmet Karatas, Yunus Bicen
Summary: Nanofluids have shown significant improvements in breakdown voltage, thermal conductivity, and other properties compared to traditional insulating fluids. Further research is needed to explore their full potential in electrical networks.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Review
Engineering, Electrical & Electronic
Marina N. Lyutikova, Sergey M. Korobeynikov, U. Mohan Rao, Issouf Fofana
Summary: Due to growing environmental concerns, synthetic and natural esters have become the focus for high-voltage equipment insulation in the past two decades. These ester liquids are biodegradable, non-toxic, safe for the environment and human health, and derived from renewable sources with high fire resistance. However, their use is limited in electrical equipment due to factors such as high cost, viscosity and density, electrostatic charge, and faster propagation of streamers in an inhomogeneous electric field. This article presents a comprehensive review on the blend of mineral oil and alternative dielectric fluids, discussing research progress, challenges, and tutorial elements. This is valuable for researchers, utilities, and transformer owners concerned with ester liquids and retrofilling.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Review
Engineering, Electrical & Electronic
S. M. W. Masra, Y. Z. Arief, S. K. Sahari, M. S. Muhammad, A. R. H. Rigit, M. R. Rahman
Summary: This review systematically examines the development and application of palm oil as a biodegradable oil insulation substitute. Divided into three subsections, the review discusses the research trends of palm oil and its potential as a substitute for biodegradable oil insulation. It also compares palm oil with other types of natural ester oils and provides suggestions for future work.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Chemistry, Physical
Binghao Chen, Jiahui Yang, Hexing Li, Ziming Su, Rui Chen, Chao Tang
Summary: This study investigates the application prospects of bio-based sustainable natural ester as an electrical equipment insulation, focusing on the use of nanotechnology for improving its electrical and physical and chemical properties. The results show that the KH550 surface modified nano-TiO2 has a superior effect on improving the electrical properties of the insulating oil compared to nano-TiO2. The amino and silicon hydroxyl groups on the surface of KH550-TiO2 carry strong positive electrostatic potential, which enhances the dispersion of KH550-TiO2 in natural esters.
SURFACES AND INTERFACES
(2023)
Article
Green & Sustainable Science & Technology
Anu Kumar Das, Dayal Ch Shill, Saibal Chatterjee
Summary: This paper examines the application of natural esters and new vegetable oils as alternatives to conventional mineral oils in the electric utility. It focuses on the dielectric performance and environmental safety of coconut oil, and discusses its sustainability and market potential.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
S. O. Oparanti, A. A. Khaleed, A. A. Abdelmalik
Summary: In the quest for a clean alternative insulating oil, the potential of transformer oil-based nanofluids using natural ester as a green alternative has been thoroughly investigated. This study focused on improving the physicochemical properties, dielectric loss, and breakdown voltage of palm kernel oil ester by incorporating Al2O3 and TiO2 nanoparticles. The dispersion of nanoparticles in the fluid was found to increase the breakdown voltage and decrease the dielectric loss of the nanofluid sample, showing improved performance compared to the base alkyl ester.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Thermodynamics
Rashmi Walvekar, Danial Aminin Zairin, Mohammad Khalid, Nabisab Mujawar Mubarak, T. C. S. M. Gupta
Summary: This study investigated the thermal conductivity, viscosity, and thermal degradation of naphthenic-based mineral oil, palm oil methyl ester (POME), and their blend. Results showed that blending POME with mineral oil can enhance properties such as thermal conductivity, viscosity, flash point, and thermal degradation, leading to improved system performance and faster heat dissipation.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Electrical & Electronic
Feipeng Wang, Liangxuan Ouyang, Chao Song, Zijian Yang, Shi Li, Yang Xu, Jian Li
Summary: In this study, the natural ester insulating oil (FR3) is blended into the synthetic tetra-ester insulating oil (KA) through mixing and oscillating. The physicochemical and electrical properties of the ester blends indicate that the flash point, fire point, and ac breakdown voltage of KA can be increased, and the dissipation factor of KA can be reduced by the addition of FR3. The optimized ester blend (85% KA: 15% FR3) demonstrates high flash point, low pour point, low dissipation factor, high ac breakdown voltage, and high DSC onset temperature.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Agricultural Engineering
Rawitsara Intasit, Nitnipa Soontorngun
Summary: This study aimed to optimize culture medium composition to increase the production of fermentative palm oil-derived Sophorolipids (SLs) by S. riodocensis and S. bombicola. The researchers achieved high SL yields by altering the concentration and ratio of carbon and nitrogen sources, and scaling up the production increased yields by 35-43%. Increased SL production will contribute to the development of HFA-based bioplastics and biochemicals in the future.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Engineering, Multidisciplinary
Ujjal Sur
Summary: This paper proposes a low-cost mechanism for accurately measuring the dissipation factor and its related effect on transformer insulating oil. The proposed method utilizes a modified De Sauty bridge network and operational amplifier to eliminate the impact of stray capacitance. Experimental results show that the proposed method is reliable and effective compared to existing standards and commercial devices.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
