IET Nanodielectrics最新文献

A combined technique for power transformer fault diagnosis based on k-means clustering and support vector machine 基于均值聚类和支持向量机的电力变压器故障诊断组合技术

IF 3.8

IET Nanodielectrics Pub Date : 2024-07-02 DOI: 10.1049/nde2.12088

Arnaud Nanfak, Abdelmoumene Hechifa, Samuel Eke, Abdelaziz Lakehal, Charles Hubert Kom, Sherif S. M. Ghoneim

{"title":"A combined technique for power transformer fault diagnosis based on k-means clustering and support vector machine","authors":"Arnaud Nanfak, Abdelmoumene Hechifa, Samuel Eke, Abdelaziz Lakehal, Charles Hubert Kom, Sherif S. M. Ghoneim","doi":"10.1049/nde2.12088","DOIUrl":"10.1049/nde2.12088","url":null,"abstract":"This contribution presents a two-step hybrid diagnostic approach, combining k-means clustering for subset formation, followed by subset analysis conducted by human experts. As the feature input vector has a significant influence on the performance of unsupervised machine learning algorithms, seven feature input vectors derived from traditional methods, including Duval pentagon method, Rogers ratio method, three ratios technique, Denkyoken method, ensemble gas characteristics method, Duval triangle method, and Gouda triangle method were explored for the subset formation stage. The seven proposed individual methods, corresponding to the seven feature input vectors, were implemented using a dataset of 595 DGA samples and tested on an additional 254 DGA samples. Furthermore, a combined technique based on a support vector machine was introduced, utilising the diagnostic results of the individual methods as input features. From training and testing, with diagnostic outcomes of 91.09% and 90.94%, the combined technique demonstrated the highest overall diagnostic accuracies. Using the IEC TC10 database, the diagnosis accuracies of the proposed diagnostic methods were compared to existing methods of literature. From the results obtained, the combined technique outperformed the proposed individual methods and existing methods used for comparison.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 3","pages":"175-187"},"PeriodicalIF":3.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141684788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement in non-linear electrical conductivity of silicone rubber by incorporating zinc oxide fillers and grafting small polar molecules 通过加入氧化锌填料和接枝小极性分子改善硅橡胶的非线性导电性能

IF 3.8

IET Nanodielectrics Pub Date : 2024-05-20 DOI: 10.1049/nde2.12080

Qingguo Chi, Huiyang Zhang, Zhaotong Meng, Changhai Zhang, Yongquan Zhang, Yue Zhang, Chao Yin, Tiandong Zhang

{"title":"Improvement in non-linear electrical conductivity of silicone rubber by incorporating zinc oxide fillers and grafting small polar molecules","authors":"Qingguo Chi, Huiyang Zhang, Zhaotong Meng, Changhai Zhang, Yongquan Zhang, Yue Zhang, Chao Yin, Tiandong Zhang","doi":"10.1049/nde2.12080","DOIUrl":"10.1049/nde2.12080","url":null,"abstract":"Silicone rubber (SiR) is commonly used in reinforced insulation parts for high-voltage direct current (HVDC) cable accessories due to its excellent insulation, elasticity, and high-temperature resistance. HVDC cable accessories always suffer from the local electric field concentration due to the electrical conductivity mismatch between reinforced insulation and main insulation, which can ultimately lead to electric breakdown. The non-linear conductive composites based on SiR have the ability to adaptively adjust the distribution of the electric field in cable accessories. This is expected to solve the problem of localised electric field concentration. The zinc oxide (ZnO) and glycidyl methacrylate (GMA) are used as fillers and grafted modifier respectively to improve the non-linear electrical conductivity of ZnO/SiR-GMA composites. The results indicate that grafting GMA can increase electrical conductivity of SiR, while doping ZnO filler enables SiR to have non-linear conductivity characteristics. The combination of doping and grafting modification of the composites achieves excellent non-linear conductive properties at lower ZnO filler content. Additionally, the mechanical properties of the modified composites are enhanced. The simulation results indicate that ZnO/SiR-GMA is the most effective material for homogenising the electric field when used as reinforced insulation for cable intermediate joints.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 3","pages":"162-174"},"PeriodicalIF":3.8,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12080","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141120301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Traditional fault diagnosis methods for mineral oil-immersed power transformer based on dissolved gas analysis: Past, present and future 基于溶解气体分析的矿物油浸式电力变压器传统故障诊断方法：过去、现在和未来

IF 3.8

IET Nanodielectrics Pub Date : 2024-04-22 DOI: 10.1049/nde2.12082

Arnaud Nanfak, Eke Samuel, Issouf Fofana, Fethi Meghnefi, Martial Gildas Ngaleu, Charles Hubert Kom

{"title":"Traditional fault diagnosis methods for mineral oil-immersed power transformer based on dissolved gas analysis: Past, present and future","authors":"Arnaud Nanfak, Eke Samuel, Issouf Fofana, Fethi Meghnefi, Martial Gildas Ngaleu, Charles Hubert Kom","doi":"10.1049/nde2.12082","DOIUrl":"10.1049/nde2.12082","url":null,"abstract":"A key factor in ensuring the efficient and safe operation of power transformers is the early and accurate diagnosis of incipient faults. Among the tools available to achieve this goal, dissolved gas analysis (DGA) is widely used by power transformers' maintenance professionals. It is a preventive maintenance tool, used for condition monitoring, fault diagnosis and unplanned outage prevention. With the development of artificial intelligence (AI), many intelligent-based methods using AI tools have been proposed in the literature for DGA data interpretation. Although these methods achieve high diagnostic accuracies and improve DGA efficiency, they are generally complicated and the research documented in these publications is difficult to replicate. Traditional DGA-based methods are simple, easy to understand and implement, and widely used by power transformers' maintenance professionals. Many methods proposed in recent years overcome the limitations of the pioneer methods and are increasingly effective. The authors present a detailed and comprehensive literature review of the traditional DGA-based methods for mineral oil-immersed power transformer faults diagnosis. This review also addresses ways to improve the efficiency of the available traditional methods. Some pitfalls that need to be taken into account to improve the efficiency of the DGA-based diagnostic methods are also presented.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 3","pages":"97-130"},"PeriodicalIF":3.8,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12082","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140675766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced thermal conductivity and self-healing property of PUDA/boron nitride micro-sheets composites with a small number of graphene nano-platelets 含有少量石墨烯纳米片的 PUDA/ 氮化硼微片复合材料的导热性和自愈合性能得到增强

IF 3.8

IET Nanodielectrics Pub Date : 2024-03-21 DOI: 10.1049/nde2.12073

Shiyu Zhang, Zhihui Shang, Dongliang Ding, Xu Wang, Ya Wu, Shifeng Nian, Zhenguo Liu, Qiuyu Zhang, Yanhui Chen

{"title":"Enhanced thermal conductivity and self-healing property of PUDA/boron nitride micro-sheets composites with a small number of graphene nano-platelets","authors":"Shiyu Zhang, Zhihui Shang, Dongliang Ding, Xu Wang, Ya Wu, Shifeng Nian, Zhenguo Liu, Qiuyu Zhang, Yanhui Chen","doi":"10.1049/nde2.12073","DOIUrl":"10.1049/nde2.12073","url":null,"abstract":"Self-healing polyurethane diacrylate (PUDA) composites with outstanding thermal conductivity were prepared with variable boron nitride (BN) and a small number of graphene nanoplatelets (GNPs) (1 wt%). The thermal conductivity of PUDA composites containing 1 wt% GNPs and 29 wt% BN reached 1.73 W/(m·K), showing 27.2% increment compared to PUDA composites only with 30 wt% BN. BN and GNPs mutually promoted the dispersion in the PUDA matrix, and the small number of GNPs was enough to bridge the gaps between BN, so that GNPs and BN exerted a synergistic enhancement effect on the thermal conductivity of PUDA composites with a synergistic efficiency of 1.343. The PUDA composites maintained the tensile strength of 8.21 MPa with good electrical insulation (4.55 × 109 Ω cm). The high degrees of recovery of mechanical strength (>90%) and thermal conductivities (>84%) were also realised by the healing effect of the reversible DA reaction. The PUDA composites with excellent comprehensive properties show broad application potential in the thermal management of electronic devices.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 3","pages":"150-161"},"PeriodicalIF":3.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12073","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140221894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the dielectric properties of polypropylene for metallised film capacitors based on cyclic olefin copolymer blending 基于环状烯烃共聚物混合物改善金属化薄膜电容器用聚丙烯的介电性能

IF 3.8

IET Nanodielectrics Pub Date : 2024-03-11 DOI: 10.1049/nde2.12072

Meng Xiao, Mengdie Zhang, Boxue Du, Kailun Fan

引用次数: 0

Data sonification of film capacitors 薄膜电容器的数据超声处理

IF 2.7

IET Nanodielectrics Pub Date : 2024-03-07 DOI: 10.1049/nde2.12078

Yong-Xin Zhang, Di-Fan Liu, Xin-Yi Wei, Xin-Jie Wang, Fang-Yi Chen, Qi-Kun Feng, Wen-Yuan Cao, Wen-Zhuo Dong, Faisal Mehmood Shah, Yu-Xiao Liu, Zhi-Yuan Wu, Jian-Tao Wang, Shao-Long Zhong, Zhi-Min Dang

{"title":"Data sonification of film capacitors","authors":"Yong-Xin Zhang, Di-Fan Liu, Xin-Yi Wei, Xin-Jie Wang, Fang-Yi Chen, Qi-Kun Feng, Wen-Yuan Cao, Wen-Zhuo Dong, Faisal Mehmood Shah, Yu-Xiao Liu, Zhi-Yuan Wu, Jian-Tao Wang, Shao-Long Zhong, Zhi-Min Dang","doi":"10.1049/nde2.12078","DOIUrl":"10.1049/nde2.12078","url":null,"abstract":"Film capacitors are playing an increasingly important role in power-related fields, driven by the continuous development of dielectric materials and practical needs. Long-term accumulation has also led to an increasing wealth of data related to film capacitors. Sonification opens up a new way for people to make good use of data from film capacitors. A framework for sonifying film capacitors data based on TwoTone is presented. Based on the analysis and discussion, it is clear that the sonification results can easily represent the monotonic variation pattern of film capacitors data. What's more, the sonification results increase the possibility that people pay attention to the changing trend of film capacitors data when there is no significant difference in the visual perception of the data. In addition to providing a new way of music generation of electrical equipment, the method proposed is expected to contribute to theory reference in typical scenarios, such as factory calibration of film capacitors, monitoring of film capacitor operation status, and presentation of statistical data of film capacitors' dielectric materials, which will help us to better understand the distribution characteristics of polymer films.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 2","pages":"88-95"},"PeriodicalIF":2.7,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140077412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic optimization of piezoelectric ceramic and its application in mechanical antenna 压电陶瓷的电磁优化及其在机械天线中的应用

IF 2.7

IET Nanodielectrics Pub Date : 2024-01-18 DOI: 10.1049/nde2.12077

Song Gao, Liwei Wang, Jingtong Lu, Shuai Zhang, Hongyu Sun, Kai Huang, Jianchun Xu, Yanan Hao

{"title":"Electromagnetic optimization of piezoelectric ceramic and its application in mechanical antenna","authors":"Song Gao, Liwei Wang, Jingtong Lu, Shuai Zhang, Hongyu Sun, Kai Huang, Jianchun Xu, Yanan Hao","doi":"10.1049/nde2.12077","DOIUrl":"10.1049/nde2.12077","url":null,"abstract":"Mechanical antennas have garnered considerable attention due to their ability to address the challenges posed by the significant size and high energy consumption associated with traditional electric antennas when operating at low frequencies. Here, a compact and structurally stable mechanical antenna design is presented. The proposed antenna is constructed using cylindrical piezoelectric ceramics, which have dimensions smaller than 1/1000 of the wavelength. The scrutiny of the influence exerted by the antenna feed area and material thickness on the radiation performance was undertaken, followed by an exhaustive discourse on these effects. Experimental measurements demonstrate the practical functionalities of signal coding, transmission, and reception in the low-frequency communication system. Notably, at a frequency of 288 kHz, a single proposed antenna achieves an effective information transmission distance of 60 m using binary information coding. This remarkable outcome underscores the potential of this design in facilitating the development of portable and cost-effective wireless communication equipment for low-frequency applications.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 1","pages":"1-6"},"PeriodicalIF":2.7,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139615665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A strong dependence of sputtering power on c-axis oriented aluminium nitride on Si (111): A structural and electrical study 溅射功率对 Si (111) 上 c 轴取向氮化铝的强烈依赖性：结构和电学研究

IF 2.7

IET Nanodielectrics Pub Date : 2024-01-03 DOI: 10.1049/nde2.12076

Sandeep Sanjeeva, Jyothilakshmi Rudresh, K. B. Vinayakumar, K. K. Nagaraja

{"title":"A strong dependence of sputtering power on c-axis oriented aluminium nitride on Si (111): A structural and electrical study","authors":"Sandeep Sanjeeva, Jyothilakshmi Rudresh, K. B. Vinayakumar, K. K. Nagaraja","doi":"10.1049/nde2.12076","DOIUrl":"10.1049/nde2.12076","url":null,"abstract":"Growing and controlling the c-axis orientation of the aluminium nitride (AlN) thin film on unheated Si (111) substrates using reactive magnetron sputtering are challenging. Sputtering parameters such as nitrogen concentration and sputtering power were effectively tuned to grow the c-axis oriented AlN thin film. The results show that a low concentration of (25%) N2 is enough for forming AlN at a reduced flow rate, whereas a higher flow rate requires a higher concentration of N2. Low concentration with a low flow rate is preferred to grow AlN at low temperature and power. The poor crystallinity of AlN with (100) orientation was improved by varying the power from 75 to 175 W. The X-ray diffraction results confirmed the improvisation of crystallinity of grown AlN films and indicated the strong dependence of preferred c-axis orientation on sputtering power. Also, the dependence of sputtering power on microstrain and stress was analysed. The surface morphology study by field emission scanning electron microscopy and topography measured by an atomic force microscope shows a dependence on sputtering power. The high c-axis orientation was observed at 175 W with low surface roughness, low leakage current density (2 × 10−9 A/cm2) and low dielectric constant (6.8).","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 1","pages":"7-17"},"PeriodicalIF":2.7,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139387905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of chlorotriﬂuoroethylene (CTFE) units on the dielectric and energy storage properties of P(VDF-CTFE) 三氟氯乙烯 (CTFE) 单元对 P(VDF-CTFE) 介电和储能特性的影响

IF 2.7

IET Nanodielectrics Pub Date : 2024-01-03 DOI: 10.1049/nde2.12075

Haoran Xie, Xi Yuan, Hang Luo, Dou Zhang

{"title":"The effects of chlorotriﬂuoroethylene (CTFE) units on the dielectric and energy storage properties of P(VDF-CTFE)","authors":"Haoran Xie, Xi Yuan, Hang Luo, Dou Zhang","doi":"10.1049/nde2.12075","DOIUrl":"10.1049/nde2.12075","url":null,"abstract":"Polyvinylidene fluoride-based ferroelectric polymers are favoured in the field of advanced high-energy-storage dielectric capacitors due to their strong spontaneous polarisation and high dielectric constant (εr). It has been confirmed that the ferroelectric behaviour and energy storage performance can be regulated by copolymerising polyvinylidene fluoride with bulky monomers such as chlorotriﬂuoroethylene, and hexaﬂuoropropylene. Past research based on these copolymers mostly focused on the preparation of composites, yet with limited discussion on the effect of copolymer composition. In this work, a series of P(VDF-CTFE) films with different chlorotriﬂuoroethylene contents were fabricated through a solution-casting method. The introduction of bulky chlorotriﬂuoroethylene units can tune the polymer crystal structure and crystallinity, alter the state of polymer chains and the response of dipoles to electric fields, and lead to dramatic changes in dielectric properties, breakdown strength (Eb), and energy storage density (Ue). As a result, the copolymer with a chlorotriﬂuoroethylene content of 15 wt% obtained the best overall performance, and the Ue reached 16.73 J/cm3 at 650 kV/mm. This work provides a basis for the optimisation of the properties of polyvinylidene fluoride-based ferroelectric polymers and the development of high Ue dielectric.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 1","pages":"18-25"},"PeriodicalIF":2.7,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12075","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139389034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexible smart surface coating for GIS/GIL epoxy insulators 用于 GIS/GIL 环氧绝缘子的柔性智能表面涂层

IF 2.7

IET Nanodielectrics Pub Date : 2024-01-02 DOI: 10.1049/nde2.12074

Yu-Huai Wang, Zhuo Chen, Jin Li, Zhi-Xiang Liu, Rong Chen, Hein Htet Aung, Hu-Cheng Liang, Bo-Xue Du

引用次数: 0