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Influencing Mechanism of Adhesive on Partial Discharge of Pressboard Block under AC/DC Composite Voltage
Yi Zhang;Bo Qi;Yukun Ma;Meng Huang;Qing Yuan;Yuzhen Lv;Yanqiu Jiao;Chengrong Li;Shuqi Zhang
The phenolic adhesive and casein adhesive are two kinds of adhesives used in pressboard block production. The partial discharge characteristics of pressboard block containing the two types of adhesives under AC, DC and AC/DC composite voltage are researched in this paper. Using the block samples with phenolic adhesive or casein adhesive, the partial discharge characteristics, flashover characteris...Show More
Hollow TiO2Spheres Effect on Dielectric Strength of Oil-Paper Composite Insulation
Baixin Liu;Guangshuai Sun;Yupeng Ying;Yuzhen Lv;Meng Huang;Bo Qi
2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2020 | Conference Paper |
Dielectric strength of transformer oil and oil-impregnated paper has been widely investigated to ensure operation safety of power transformers and other electrical equipment. Addition of nanoparticles has exhibited the ability to improve insulation strength of oil or oil-impregnated paper. However, enhancement on breakdown strength of oil-paper composite insulation (OPCI) is still a challenge, esp...Show More
Research on DC Breakdown Performance of Nanofluid-impregnated Pressboard Based on TiO2 Nanoparticles
Bingliang Shan;Yanyu Wu;Hanlin Song;Zhaoliang Xing;Meng Huang;Baixin Liu;Yuzhen Lv;Chengrong Li
2020 IEEE 3rd International Conference on Dielectrics (ICD)
Year: 2020 | Conference Paper |
UHVDC has been applied widely since it possesses technical advantages in transmission electric power in long distance and large capability, leading to the severe test for the insulation performance of converter transformer. Oil-impregnated pressboard (OP) is one of the key insulating components in converter transformer due to its high mechanical strength and dielectric property, and its electrical...Show More
Effect of TiO2 nanoparticles on DC breakdown performance of transformer oil-impregnated pressboard
Bingliang Shan;Yupeng Ying;Meng Huang;Mingkang Niu;Bo Qi;Chengrong Li;Qian Sun;Yuzhen Lv
Transformer oil-based nanofluid-impregnated pressboard (NIP) with TiO2 nanoparticles has been previously shown to exhibit substantially higher AC breakdown strength than that of pure oil-impregnated pressboard (OIP). In this study, OIP and NIP with TiO2 nanoparticles were prepared and experiments on DC breakdown strength of were performed. It was found that NIP possesses higher resistance to DC br...Show More
The effects of TiO2 nanoparticles on insulation and charge transport characteristics of aged transformer oil
Zhen Sun;Yang Ge;Yuzhen Lv;Meng Huang;Chengrong Li;Yuefan Du
2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)
Year: 2019 | Conference Paper |
Cited by: Papers (2)
The insulation property of transformer oil is prone to decreasing due to insulation aging caused by the heat, electricity and other factors under the long-term operation, which is vital to the safe operation of power equipment. It has been reported that nanoparticles can improve the insulation properties of transformer oil. However, there has been no evidence showing the effect of nanoparticles on...Show More
Effects of TiO2Nanoparticle Size on Dielectric Properties of Transformer Oil
Yang Ge;Mingkang Niu;Lei Wang;Meng Huang;Yuzhen Lv;Chengrong Li;Jinsha Yuan
2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2018 | Conference Paper |
Cited by: Papers (4)
A lot of efforts have been made to increase the dielectric properties of transformer oil, which is of significance to the safe operation of power system. However, there has been lack of experimental evidence that the size of nanoparticle has an effect on dielectric properties of transformer oil, which is helpful for better functional design of transformer oil-based nanofluids. Therefore, it is nec...Show More
Effect of nanoparticle type on prebreakdown and breakdown characteristics of transformer oil
Cheng Chen;Mingkang Niu;Lei Wang;Yang Ge;Meng Huang;Yuzhen Lv;Chengrong Li
2018 IEEE 2nd International Conference on Dielectrics (ICD)
Year: 2018 | Conference Paper |
Cited by: Papers (6)
In order to reveal the effects of nanoparticle type on breakdown and prebreakdown characteristics, this paper presents an experimental study on the effects of conductive Fe3O4 nanoparticles, semi-conductive TiO2 nanoparticles and insulating Al2O3 nanoparticles on the breakdown strength and prebreakdown streamer propagation in transformer oil under positive lightning impulse voltage. Nanoparticle w...Show More
The influence of polarity reversal time on interface charges in oil-impregnated pressboard insulation under non-uniform electric field
Bo Qi;Quanmin Dai;Chengrong Li;Yuzhen Lv;Meng Huang;Shuqi Zhang
The polarity reversal test is one of the routine tests for the evaluation of electric insulation in converter transformers. The polarity reversal time (PRT) has significant effect on the accumulation of interface charges in oil-impregnated pressboard insulation. IEC standard recommends that polarity reversal should be performed within 2 min so as to match with the dispersion rate of interface char...Show More
Effect of nanoparticle shapes on creeping flashover characteristics at the interface of nanofluid-impregnated pressboard
Meng Huang;Qiu-bo Han;Yu-zhen Lv;Lei Wang;Bing-liang Shan;Yang Ge;Bo Qi;Cheng-rong Li
Recent studies have shown that the modifications to nanofluid-impregnated pressboards by different shapes of nanoparticles are different. To investigate the effect of nanoparticles shapes on creeping flashover characteristics at the interface of nanofluid-impregnated pressboard (NP), creeping flashover behavior of spherical nanoparticle fluid/pressboard (NSFP) and nanorod fluid /pressboard (NRFP) ...Show More
Effects of TiO2 Nanoparticles on Streamer Propagation at the Surface of Oil-Impregnated Insulation Paper
Yang Ge;Yuzhen Lv;Qiubo Han;Qian Sun;Meng Huang;Chengrong Li;Bo Qi;Jinsha Yuan
Recent studies have found that the surface flashover strength of oil-impregnated insulation paper can be improved by the modification of nanoparticles. To reveal the working mechanism, this paper presents an experimental study on the effects of TiO2 nanoparticles on streamer propagation process at the surface of oil-based nanofluid-impregnated insulation paper under lightning impulse voltage. The ...Show More
Effects of trap characteristics on streamer propagation in dielectric liquid
Junjie Zhang;Wei Cui;Kai Bao;You Zhou;Xiangjun Zeng;Yuzhen Lv;Chengrong Li
2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
Due to physical and chemical complexity, the mechanism for breakdown process of dielectric liquids is not clear. In this paper, electric field dependent molecular ionization was used to model the positive streamer in transformer oil. The relationship between electron hopping transition mobility and trap characteristic was analyzed. And the influence of trap characteristics on the propagating strea...Show More
Positive streamer characteristic at the interface of TiO2 nanofluid/pressboard under lightning impulse voltage
Yang Ge;Hanyu Zou;Bingliang Shan;Yuzhen Lv;Meng Huang;Chengrong Li;Huamao Zhan;Jinsha Yuan
2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)
Year: 2017 | Conference Paper |
Cited by: Papers (3)
Recent studies have found that the creeping flashover strength of oil-impregnated pressboard can be improved by the modification of nanoparticles. To further explore the modification effect of nanoparticles, this paper studied the effect of TiO2 nanoparticles on the creeping flashover strength of transformer oil-impregnated pressboard and its prebreakdown streamer characteristics under positive li...Show More
Breakdown strength of transformer oil modified by TiO2 nanoparticles under AC-DC combined voltage
Bingliang Shan;Qian Sun;Chao Li;Yuzhen Lv;Meng Huang;Chengrong Li;Bo Qi
2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
The dielectric strength of transformer oil can be greatly improved by the modification of nanoparticles under AC, DC and positive impulse voltage, respectively. In comparison with the certain voltage, the combined voltage is more complicated and important for the safe operation of the converter transformer. However, the modification effect of nanoparticles on the breakdown characteristic of transf...Show More
Study of water molecules state in transformer oil via FT-IR spectrum and molecular dynamic simulation
Chao Li;Qian Sun;Yu-zhen Lv;Lei Wang;Meng Huang;Cheng-rong Li;Bo Qi
2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)
Year: 2017 | Conference Paper |
Cited by: Papers (3)
Mineral transformer oil has been widely used in the power transformers due to its good insulating property and thermal conductivity. It is well-known that water molecules in the oil have detrimental effect on its conduction and breakdown strength and tend to cause accelerated aging of oil and paper insulation system. The relation of the total amount of water to the electrical properties of oil has...Show More
Effect of electrical conductivity on the ion mobility in dielectric liquids
Qian Du;Yang Ge;Bingliang Shan;Yuzhen Lv;Meng Huang;Chengrong Li;Bo Qi;Jinsha Yuan
2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
Conduction process in dielectric liquids has been studied for many years because of its importance in understanding the process of dielectric breakdown. As a key parameter in conduction process, ion mobility has been measured by various methods. The reversal polarity method has been widely used to accurately measure the ion mobility in the dielectric liquids. In this paper, the effect of electrica...Show More
Fractal Analysis of Positive Streamer Patterns in Transformer Oil-Based TiO2 Nanofluid
Yuzhen Lv;Yang Ge;Qian Du;Qian Sun;Bingliang Shan;Meng Huang;Chengrong Li;Bo Qi;Jinsha Yuan
In this paper, prebreakdown streamers in transformer oil and transformer oil-based TiO2 nanofluid were observed by the schlieren method under positive lightning impulse voltage. Streamers in the nanofluid have numerous branches with much shorter length, whereas in the pure oil, they exhibit only certain filaments with longer length. The discrepancy in positive streamer pattern of both oils is furt...Show More
Preparation and study of breakdown features of transformer oil based magnetic nanofluids
Muhammad Rafiq;Chengrong Li;Yuzhen Lv;Kai Yi;Shafqat Hussnain
2017 International Conference on Electrical Engineering (ICEE)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
Nanofluids were developed by suspending conductive nanoparticles (Fe3O4) to improve the dielectric properties of transformer oil. The AC and lightening impulse breakdown voltages were measured for prepared samples in accordance to IEC standards. The results menifested that the addition of conductive nanoparticles (NPs) to the mineral oil can improve the mean AC breakdown performance 1.16 times of ...Show More
Breakdown characteristics of transformer oil based silica nanofluids
2016 19th International Multi-Topic Conference (INMIC)
Year: 2016 | Conference Paper |
Cited by: Papers (11)
A fluid consisting of nano-sized particles is known as nanofluid. It manifests better cooling abilities compared to the host fluid. The aim of this study is to analyze the AC and impulse breakdown strength of mineral oil based SiO2 nanofluids (NFs). The volume fractions used was 20%. The influence of moisture on AC breakdown strength was investigated. Moreover, the positive and negative impulse br...Show More
Effect of Fe3O4 nanoparticle size on impulse breakdown strength of mineral oil-based nanofluids
Muhammad Rafiq;Kai Yi;Chengrong Li;Yuzhen Lv;Muhammad Numan;Usman Nasir
2016 International Conference for Students on Applied Engineering (ICSAE)
Year: 2016 | Conference Paper |
Cited by: Papers (3)
Insulating oil modified by nanoparticles (NPs), which is often referred as nanofluids (NFs), has the potential to evolve into substitute of conventional transformer oil for their excellent electrical and thermal characteristics. They have attracted huge attention recently, particularly concerning the improvement of electrical breakdown. This paper develops a relationship that how sizes of NPs affe...Show More
Simulation of ion mobility in transformer oil in different electrode systems
Qian Du;Zhifeng Hu;Yang Ge;Yuzhen Lv;Chengrong Li;Bo Qi;Jinsha Yuan
2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2016 | Conference Paper |
Accurately measurement of ion mobility behavior in transformer oil is critical for reasonable designing and safely operating HVDC transformers due to its electric field distribution determined by the ion migration in the oil. In this paper, we aim to investigate the effect of electrode configuration on the testing accuracy of ion mobility via the reversal polarity method. Both parallel plane elect...Show More
Fractal analysis of streamer patterns in transformer oil under lightning impulse voltage
Yang Ge;Qian Du;Bingliang Shan;Yuzhen Lv;Chengrong Li;Jinsha Yuan
2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
The insulation of dielectric liquids is of great importance for safe operation of transformers. It is generally recognized that the breakdown happens when streamers completely bridge two conductors inside the transformer, leading to insulation failure. The propagation shapes of streamers can be obtained with the help of optical technology and be analyzed qualitatively. Fractal dimension has been i...Show More
Breakdown characteristics of mineral oil based magnetic nanofluids
2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2016 | Conference Paper |
Cited by: Papers (7)
Nanofluids were prepared by adding magnetic nanoparticles to enhance the dielectric accomplishment of transformer oil. Breakdown voltages are tested under AC and lightning impulse stresses of all the prepared fluids in accordance to IEC standards. The test outcomes showed that the suspension of magnetic nanoparticles (NPs) to the carrier oil may upgrade the mean AC breakdown performance 1.14 times...Show More
Effect of SiO2 nanoparticle on insulating breakdown properties of transformer oil
2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2016 | Conference Paper |
Cited by: Papers (5)
Nanoparticles have manifested the potential to enhance the breakdown performance of transformer oil. The AC and positive lightening impulse breakdown strengths of the oil samples with and without nanoparticles were measured according to IEC standard methods. The test results indicate that addition of silica nanoparticles can enhance the ac breakdown strength of transformer oil. Additionally, the m...Show More
Effect of Fe3O4 nanoparticle concentrations on dielectric property of transformer oil
2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2016 | Conference Paper |
Cited by: Papers (12)
Nanoparticles have the potential to enhance the insulation conduct of transformer oil. The concentration of nanoparticles influences the breakdown vitality of mineral oil. In this investigation, mineral oil based nanofluids were prepared by scattering magnetic nanoparticles into transformer oil with different concentrations from 5% to 80% w/v. The AC and lightning impulse breakdown strengths of th...Show More
Effect of different nanoparticle types on breakdown strength of transformer oil
2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Year: 2016 | Conference Paper |
Cited by: Papers (8)
Nanoparticles have the potential to affect the insulation performance of transformer oil. The different types of nanoparticles (NPs) influence the breakdown strength of mineral oil. In this paper, mineral oil based nanofluids (NFs) have been prepared by dispersing different types of nanoparticles into transformer oil. The AC and positive lightening impulse breakdown strengths of the oil samples wi...Show More
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