Article
Energy & Fuels
Siti Sarah Junian, Mohamad Zul Hilmey Makmud, Zuhair Jamain, Khairatun Najwa Mohd Amin, Jedol Dayou, Hazlee Azil Illias
Summary: This study demonstrates the effectiveness of utilizing rice husk as a filler for insulating oil to improve its physicochemical and dielectric properties, as well as its moisture absorbent properties.
Article
Nanoscience & Nanotechnology
Yasuyuki Tsuboi, Shota Naka, Daiki Yamanishi, Tatsuya Nagai, Ken-ichi Yuyama, Tatsuya Shoji, Bunsho Ohtani, Mamoru Tamura, Takuya Iida, Tatsuya Kameyama, Tsukasa Torimoto
Summary: The research focuses on optical trapping of inorganic nanocrystals at oil/water interfaces under a loose focus condition. The study successfully trapped octahedral gold nanoparticles, rice-shaped ZnS-AgInS2 nanoparticles, and octahedral titania nanoparticles at the oil/water interface. The experiment also observed the formation of a hybrid particle at the interface and the spontaneous breakdown of rotational symmetry in the optically coupled nanoparticles.
ACS APPLIED NANO MATERIALS
(2021)
Article
Energy & Fuels
I. Made Yulistya Negara, Daniar Fahmi, Dimas Anton Asfani, I. Gusti Ngurah Satriyadi Hernanda, Mochammad Wahyudi, Muhammad Novis Ibrahim
Summary: This study investigates the impact of floating contaminants on the electrical characteristics of transformer oil insulation, finding that the size of floating particles is inversely proportional to the average values of corona inception and breakdown, and directly proportional to the peak value of corona current. Additionally, the lowest breakdown voltage occurs when particles are close to the electrode but not in contact.
Review
Engineering, Multidisciplinary
Muhammad Rafiq, Muhammad Shafique, Anam Azam, Muhammad Ateeq
Summary: Research and applications of NFs as heat transfer fluids are rapidly growing, with a focus on preparing NFs by suspending solid nanoparticles in conventional working liquids. The impact of various factors on the thermophysical properties of NFs remains controversial, and proper characterization and material selection for NFs are crucial for improving heat transfer efficiency.
AIN SHAMS ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Yangchun Feng, Wangyang Yang, Yufang Li, Honglie Shen
Summary: In this study, the performance of acetone gas sensors was improved by introducing black TiO2 as an electron trapping layer. The best sample exhibited a low operating temperature, high acetone response, low detection limit, and good selectivity.
Article
Engineering, Electrical & Electronic
Mississippi Missouri Bhunia, Kalyan Kumar Chattopadhyay, Paramita Chattopadhyay
Summary: This paper presents the attractive properties of two-dimensional nanofillers based transformer oil nanofluids. The nanofluids demonstrate stable dispersion, improved dielectric breakdown strength, and superior thermophysical properties. The addition of hexagonal boron nitride nanosheets results in a significant increase in AC breakdown voltage and thermal conductivity. This enhancement is explained by the larger oil-nanofiller interface and the enhanced phonon transfer via the interface. The use of 2D nanofillers in transformer oil nanofluids offers high surface area, lower filler fraction, and enhanced stability.
ELECTRICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Hao-ou Ruan, Qing Xie, Shuang-shuang Wang, Ya-hui Zhang, Jing-xuan Song, Qi-jun Duan, Fang-cheng Lu
Summary: PMIA is an ideal substitute for traditional cellulose paper in oil-immersed paper insulating scenarios. This paper studies the partial discharge characteristics of oil-immersed laminated PMIA and divides the partial discharge process into 3 stages, providing a theoretical basis for the application of PMIA in electrical insulation. The micro-structure and chemical components of damaged PMIA, as well as carbon trace, functional groups, carrier trap characteristics, and residual insulation strength in different stages of partial discharge, are also studied in this paper.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Engineering, Multidisciplinary
Junjie Zhou, Qiaogen Zhang, Rui Zhang, Zhicheng Wu, Tao Wen, Chong Guo
Summary: Partial discharge (PD) caused by bubble significantly decreases the insulation performance, leading to insulation failure and posing a serious threat to the safe operation of power transformers. This study establishes a bubble PD defect model to explore the mechanism of insulation degradation. The inception and breakdown voltage of PD decrease significantly with the enlargement of bubble area and height. Through electron microscope analysis, it is determined that PD induces the breakdown of oil paper insulation. By comparing bubble area and PD parameters, a positive feedback model for insulation degradation is developed, indicating that bubble defects deteriorate rapidly in an exponential manner under the influence of PD. Additionally, the deterioration process of insulating paper is divided into four stages through electron microscope and energy spectrum analysis, revealing the micro deterioration and failure mechanism. This research contributes to understanding the insulation failure mechanism caused by bubbles and provides valuable insights for risk assessment of transformers.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2023)
Review
Engineering, Chemical
Mahdi Shayan Nasr, Ehsan Esmaeilnezhad, Hyoung Jin Choi
Summary: Silicon-based nanoparticles play a significant role in enhanced oil recovery by altering wettability, reducing interfacial tension, adjusting fluid viscosity, preventing asphaltene precipitation, and plugging channels in porous media. The effects of nanofluid/oil/rock properties on each mechanism have been comprehensively analyzed.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Engineering, Multidisciplinary
M. H. A. Hamid, M. T. Ishak, N. S. Suhaimi, J. Adnan, N. Hashim, M. Ariffin, N. I. A. Katim, Rahisham Abd Rahman
Summary: This paper investigates the dielectric properties and AC breakdown voltage behavior of Palm Oil (PO) and Rice Bran Oil (RBO). It is found that RBO has better insulating oil capability than PO, and PO has advantages in terms of stress distribution. RBO has the highest breakdown voltage, followed by PO, while MO shows the lowest breakdown voltage.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Dongxin He, Haoxin Guo, Wenjie Gong, Zhe Xu, Qingquan Li, Shijie Xie
Summary: In this study, a test pulse matching circuit was developed to accurately match the test pulse with the polarity reversal polarization voltage and perform a multi-point rapid test of the space charge transient characteristics during polarity reversal. The influence of polarity reversal time on the charge residence characteristics of oil-paper insulation was compared and analyzed. The study of the charge residence characteristics and the dynamic charge behavior during the polarity inversion process has important guiding significance for clarifying the deterioration mechanism of the converter transformer oil-paper insulation under polarity-reversal electric field.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
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)
Article
Polymer Science
Jun-Guo Gao, Hong-Shuo Liu, Ting-Tai Lee, Uwe Schachtely, Hitoshi Kobayashi, Li-Li Li
Summary: This paper investigates the impact mechanism of nanosized hydrophilic and hydrophobic fumed titania on the electrical properties of polypropylene. The results show that hydrophilic TiO2 decreases the space charge suppression ability of the nanocomposite, while hydrophobic TiO2 improves the AC/DC breakdown strength.
Article
Engineering, Electrical & Electronic
Chunyang Zhang, Kai Wu, Zepeng Lv, Xia Wang, Yifei He, Yang Wu, Jiaxin Chen, Jie Dai
Summary: This article investigates the influence of circulating insulating oil on the space charge distribution in oil-paper composite insulation. The experimental results show that increasing the oil flow velocity increases the interface charge between the oil and paper, followed by a decrease. Additionally, slower oil flows aggravate field distortion during polarity reversal.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Review
Engineering, Electrical & Electronic
Sorokhaibam Nilakanta Meitei, Kunal Borah, Saibal Chatterjee
Summary: Power transformers play a crucial role in any power system network, and their lifespan depends on the condition of insulation. Partial discharge is the main cause of insulation breakdown. Using Fiber Bragg Grating sensors for PD monitoring in oil-filled power transformers helps overcome limitations of traditional PD monitoring techniques.
IEEE SENSORS JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Ziyi Wang, Ruimin Song, Weigen Chen, Jianxin Wang, Pinyi Wang, Zhixian Zhang, Xinyuan Zhang, Fu Wan
Summary: In this study, the vibration spectroscopy of widely concerned molecules involved in sulfur corrosion phenomenon was analyzed using density functional theory and experimental measurement. The dominant conformations of these molecules were determined, and noncovalent interaction analysis was conducted to indicate intramolecular interaction. Vibration normal mode was assigned based on potential energy distribution, and spectra comparison revealed good agreement between experimental and theoretical results. The divergences among these molecules were also discussed, particularly in the vibrational behavior of the methylene group in the presence of a sulfur atom.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Engineering, Electrical & Electronic
Ziyi Wang, Ruimin Song, Weigen Chen, Xinyuan Zhang, Pinyi Wang
Summary: This paper proposes a Raman spectroscopy based method for detecting corrosive sulfur in transformer oil. By establishing a linear model to analyze the relationship between characteristic peaks and DBDS concentration, and measuring the sulfur weight content on the copper conductor surface after a corrosion test, the detection limit and the corrosion limitation were determined. The results show that the Raman spectroscopy detection method can meet the requirements in practical conditions.
Article
Biochemistry & Molecular Biology
Xinyuan Zhang, Yu Lei, Ruimin Song, Weigen Chen, Changding Wang, Ziyi Wang, Zhixian Yin, Fu Wan
Summary: In this study, the use of ZnO NPs@Ag NWs as SERS substrates combined with PLS model successfully achieved accurate quantification of acetone in transformer oil, with high sensitivity and accuracy.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
