Article
Chemistry, Applied
Feng Lang, Yu Xiang, Chunguang Xiao, Duxin Li
Summary: The article investigates a method for improving the corona resistance of insulating materials used in high-frequency power systems. The thermally imidized ODPA-ODA-SDA copolyimides are synthesized and the influence of ODPA and SDA on the dielectric properties are discussed. The experiments show that the ODPA-ODA-SDA copolyimide exhibits the best dielectric properties and corona resistance under corona ageing environment.
PROGRESS IN ORGANIC COATINGS
(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
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
Engineering, Electrical & Electronic
Anu Kumar Das, Dayal Ch. Shill, Saibal Chatterjee
Summary: This paper investigates the electrical breakdown performance of coconut oil and finds that RBD coconut oil performs well as a substitute for natural ester. Experimental results show that the viscosity and resistivity of RBD coconut oil remain stable during aging, and its breakdown strength does not significantly decrease under thermal aging conditions.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Ahmed Maher, Diaa-Eldin A. Mansour, Khaled Helal, Ramadan A. A. Abd El Aal
Summary: The authors aim to investigate the generation pattern of dissolved gases in nanofluids under thermal and electrical faults and to assess the applicability of traditional Dissolved Gas Analysis (DGA) techniques if oil-based nanofluids are used in transformers.
Article
Engineering, Electrical & Electronic
Junyi Xia, Ziyu Ma, Zichen He, Xuyuan He, Luxing Zhao, Boyang Shen, Kun He, Xingming Bian
Summary: This article explores the effects of DC polarity, DC proportion, rod radius, and rod-plane distance on corona inception phase under combined AC/DC voltage. The results show that the normalized amplitude under equivalent positive corona conforms to normal distribution. Furthermore, with the increase of DC proportion, the dispersion of the corona inception phase under equivalent positive corona becomes more obvious than that under equivalent negative corona.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Computer Science, Information Systems
Manuel S. Alvarez-Alvarado, Christian A. Apolo-Tinoco, Washington Velasquez
Summary: This paper introduces an innovative mechanism that can suppress the impact of Corona discharge in ultra-high voltage transmission systems, protecting the line from high electrical fields and improving power transfer capacity. Through quantification and modeling analysis of the impact of Corona discharge on transmission lines, the study shows that the mechanism can effectively reduce or mitigate the impact of Corona discharge, opening up new possibilities for future applications in the field of power systems protection.
Article
Engineering, Electrical & Electronic
Hanbo Zheng, Yang Hang, Yongji Feng, Xufan Li, Qingjun Peng
Summary: Natural ester is a potential alternative to mineral oil with high degradability, but its inferior breakdown characteristics hinder its application in large power equipment. This research investigates the breakdown characteristics of natural ester through calculations and model development. The results show that the natural ester has a similar breakdown voltage but a lower acceleration voltage compared to mineral oil. The model also considers the effect of temperature on carrier mobility.
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING
(2023)
Article
Thermodynamics
M. J. Zeng, Z. G. Qu, J. F. Zhang
Summary: This study experimentally investigates the effects of temperature and humidity on the current-voltage and flow characteristics of two-stage needle-to-ring type ionic wind pumps. The coupling effects of temperature, humidity, and water vapor condensation determine the current-voltage and flow characteristics, and there is a competition between humidity and vapor condensation effects on breakdown voltage, current, and velocity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Electrical & Electronic
Pichai Muangpratoom, Issaraporn Khonchaiyaphum, Wanwilai Vittayakorn
Summary: The study found that pressboard impregnated with 0.03% mineral oil-based Fe3O4 nanofluids showed the most significant increase in both AC and lightning impulse breakdown strengths, indicating promising applications for improving the electrical properties of pressboard using Fe3O4 nanomaterials.
INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS
(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
Chemistry, Physical
Milos Sarpataky, Juraj Kurimsky, Michal Rajnak, Katarina Paulovicova, Michal Krbal, Ludek Pelikan
Summary: This study presents an experimental comparison of AC breakdown voltage in natural and synthetic ester-based nanofluids with fullerene and magnetite nanoparticles. Statistical analysis shows that the AC BDV of nanofluids increases with increasing cumulative probability. Fullerene nanoparticles tend to reduce AC BDV in natural ester, while magnetic nanoparticles enhance AC BDV in both esters, though to a different extent.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Computer Science, Information Systems
Xuyuan He, Yunbo Zhou, Zichen He, Jie Zhu, Luxing Zhao, Boyang Shen, Xingming Bian
Summary: The study found that in high AC component, the corona inception voltage is higher for negative corona compared to positive corona, while in low AC component, the corona inception voltage is higher for positive corona. The corona inception voltage decreases with increasing AC component, and the remaining space charge tends to block corona inception, leading to a higher corona inception voltage.
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
Physics, Applied
J. Lemetayer, C. Marion, D. Fabre, F. Plouraboue
Summary: This contribution investigates the phenomenon of "multiple emitters un-scalability" in multiple emitters systems and finds that the corona discharge inception is affected by electro-static interactions between emitters, which can be balanced by adjusting the interactions between emitters and collectors. The study also reveals that the electrostatic interactions among emitters can be balanced by the interactions between emitters and collectors, resulting in the generation of various multi-inception patterns.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Suraj Kumar Panigrahi, Soumya Thakur, R. Sarathi, A. K. Mishra
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2017)
Article
Engineering, Electrical & Electronic
Soumya Thakur, Suraj Kumar Panigrahi, A. K. Mishra, Ramanujam Sarathi
IET SCIENCE MEASUREMENT & TECHNOLOGY
(2019)
Article
Engineering, Electrical & Electronic
Soumya Thakur, Ramanujam Sarathi
IET SCIENCE MEASUREMENT & TECHNOLOGY
(2019)
Article
Materials Science, Multidisciplinary
R. Gayathri, P. Deiva Sundari, Soumya Thakur, R. Sarathi
MATERIALS RESEARCH EXPRESS
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
S. Thakur, T. Andritsch, P. L. Lewin, A. Shaw, O. Cwikowski
Summary: The cable sealing end is a critical component in power systems responsible for terminating cables. The study investigates the impact of verdigris contamination on dielectric properties, analyzing its elemental composition and conducting sonication ageing tests on contaminated samples. Results show an increase in dielectric permittivity and moisture content in samples with verdigris contamination.
2021 IEEE ELECTRICAL INSULATION CONFERENCE (EIC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
A. Shaw, R. C. Brown, G. J. Langley, S. Thakur, G. Callender, T. Andritsch, P. L. Lewin, O. Cwikowski
PROCEEDINGS OF THE 2020 3RD IEEE INTERNATIONAL CONFERENCE ON DIELECTRICS (ICD 2020)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
S. Thakur, G. Callender, T. Andritsch, P. L. Lewin, A. Shaw, O. Cwikowski
PROCEEDINGS OF THE 2020 3RD IEEE INTERNATIONAL CONFERENCE ON DIELECTRICS (ICD 2020)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
S. Thakur, T. Andritsch, P. L. Lewin, A. Shaw, O. Cwikowski
2020 IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA (2020 IEEE CEIDP)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Soumya Thakur, R. Sarathi, Rumpee Bora
2017 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS (ISEIM), VOLS 1 & 2
(2017)
Article
Materials Science, Paper & Wood
Soumya Thakur, R. Sarathi, Ribhu Gautam, R. Vinu
