IET Nanodielectrics最新文献_第2页

Simulation Study on Sensitivity Verification of Transformer Partial Discharge Ultrasonic Sensor Affected by Field Noise 磁场噪声影响下变压器局部放电超声传感器灵敏度验证的仿真研究

IF 3.8

IET Nanodielectrics Pub Date : 2025-08-25 DOI: 10.1049/nde2.70012

Xiu Zhou, Tian Tian, Longcheng Dai, Jin Bai, Yukun Ma, Yabo Liang, Yifan Chen, Keyun Li

{"title":"Simulation Study on Sensitivity Verification of Transformer Partial Discharge Ultrasonic Sensor Affected by Field Noise","authors":"Xiu Zhou, Tian Tian, Longcheng Dai, Jin Bai, Yukun Ma, Yabo Liang, Yifan Chen, Keyun Li","doi":"10.1049/nde2.70012","DOIUrl":"10.1049/nde2.70012","url":null,"abstract":"As a critical component in transformer partial discharge monitoring and localisation, the output signal of the contact ultrasonic sensor is significantly influenced by its sensitivity. Consequently, field sensitivity verification of ultrasonic sensors is essential. However, field calibration is often impacted by environmental noise, and the effects of various noise types on the sensitivity calibration results remain inadequately understood. To address this issue, this paper introduces a sensitivity field calibration process tailored for ultrasonic sensors used in oil-immersed transformer. Transformer and ultrasonic sensor models are developed, and the sensor output signal is simulated using the finite element method. Noise signals of different types are superimposed to evaluate their effects on the sensitivity calibration results. The results indicate that under the interference of narrowband noise, white noise, and mixed noise, significant errors occur in both the root mean square fluctuation of the sensitivity curve and the peak sensitivity, whereas the error in mean sensitivity is comparatively smaller than that of the aforementioned indicators. These results provide a theoretical foundation for the development of targeted denoising techniques during field verification.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144897524","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

Molecular Dynamics Simulation of the Decomposition and Gas Generation Characteristics of Natural Ester Insulating Oils Under Overheated Conditions 过热条件下天然酯类绝缘油分解及产气特性的分子动力学模拟

IF 3.8

IET Nanodielectrics Pub Date : 2025-08-06 DOI: 10.1049/nde2.70016

Yiming Huang, Wu Lu, Weiwei Qi, Jun Zhang

{"title":"Molecular Dynamics Simulation of the Decomposition and Gas Generation Characteristics of Natural Ester Insulating Oils Under Overheated Conditions","authors":"Yiming Huang, Wu Lu, Weiwei Qi, Jun Zhang","doi":"10.1049/nde2.70016","DOIUrl":"10.1049/nde2.70016","url":null,"abstract":"Natural ester insulating oils are increasingly replacing mineral oils as the insulating medium for oil-filled equipment due to their high ignition point, biodegradability, and other environmentally friendly properties. However, the reaction characteristics of natural ester insulating oils under different types of faults require further investigation. This paper presents the development of a molecular dynamics model employing the ReaxFF reactive force field to comprehensively simulate the decomposition of natural ester insulating oils over a temperature range of 2800–4000 K, elucidating the resulting product information. The gas production behaviour of natural ester insulating oils was examined under different overheating conditions and heating times. The simulation results indicate that the thermal decomposition products of natural ester insulating oil primarily consist of seven gases, including H2, CO, CO2, and others. Notably, the concentration of C2H4 gas exhibits a significantly nonlinear negative correlation with overheating conditions. Because of variations in simulation temperatures, the characteristic gases generated during the thermal decomposition of natural ester insulating oil correspond to different fault types observed in real-world scenarios. Specifically, the gas production at a simulated temperature of 4000 K aligns with the gas production behaviour of insulating oil during discharge fault events in practice. The results of this study offer a theoretical basis for the application of insulation condition monitoring in oil-filled equipment through dissolved gas analysis (DGA).","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128859","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

Mechanical, Dielectric and Hydrophobic Properties of Phenyl Silicone Rubber and Methyl Vinyl Silicone Rubber Blend Composites 苯基硅橡胶和甲基乙烯基硅橡胶共混复合材料的力学、介电和疏水性

IF 3.8

IET Nanodielectrics Pub Date : 2025-07-18 DOI: 10.1049/nde2.70014

Xiaoli Liu, Hui Ao, Yankai Lin, Jian Wang, Shaojian He

引用次数: 0

Temperature Dependence of the Polarisation Characteristics of Epoxy Resin for Electrical Insulation 电绝缘用环氧树脂极化特性的温度依赖性

IF 3.8

IET Nanodielectrics Pub Date : 2025-07-15 DOI: 10.1049/nde2.70013

Qian Wang, Ting Lei, Jingyu Deng, Xidong Liang, Chao Wu

{"title":"Temperature Dependence of the Polarisation Characteristics of Epoxy Resin for Electrical Insulation","authors":"Qian Wang, Ting Lei, Jingyu Deng, Xidong Liang, Chao Wu","doi":"10.1049/nde2.70013","DOIUrl":"10.1049/nde2.70013","url":null,"abstract":"Epoxy resin-based dielectric materials are widely used for electrical insulation. However, due to the application of electrical equipment in complex and diverse climatic environments, the characteristic variation of the material must be paid attention to. Besides, decoupling of the overall performance is necessary to trace the source of property variation. Thus, in this research, the polarisation characteristics over broad ranges of temperature and frequency of typical epoxy resin used for electrical insulation are investigated. Moreover, the Dissado–Hill model is adopted to quantitatively decouple the individual contribution of each microprocess. It indicates that the magnitudes of the polarisation processes below the glass transition temperature (Tg) are small, the influence of which on the overall polarisation characteristics is marginal. In comparison, the influence of α relaxation initiating above Tg on the magnitude of permittivity and the dielectric loss is prominent, which must be fully taken into consideration during insulation design. In addition, due to the long structure of repeating units in the backbone of epoxy, another polarisation process would appear at higher temperatures stemming from the internal relaxation of repeating units. Furthermore, the amplitude of conductance increases exponentially as temperature rises and would become the major component of loss at elevated temperatures. This research provides insights into the rational design of insulation structures and the development of novel epoxy materials.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624590","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

Surface Flashover Phenomena and Contributory Parameters in Oil-Pressboard Composite Insulation System Under DC Voltage 直流电压下油压板复合绝缘系统的表面闪络现象及影响因素

IF 3.8

IET Nanodielectrics Pub Date : 2025-06-12 DOI: 10.1049/nde2.70011

Kai Zhou, Bo Jiang, Zilu Wang, Li Chen, Yu Shen, Zihan Teng, Lei Jin, Meng Huang

引用次数: 0

Effects of Oxygen on the Insulation Characteristics of Eco-Friendly Insulating Gas HFO-1336mzz(E)/CO2 氧对环保绝缘气体HFO-1336mzz(E)/CO2绝缘特性的影响

IF 3.8

IET Nanodielectrics Pub Date : 2025-06-11 DOI: 10.1049/nde2.70010

Song Xiao, Mingjun Tang, Chengying Wu, Hongsong Lian, Fei Wang, Haoran Xia, Ju Tang, Yi Li

{"title":"Effects of Oxygen on the Insulation Characteristics of Eco-Friendly Insulating Gas HFO-1336mzz(E)/CO2","authors":"Song Xiao, Mingjun Tang, Chengying Wu, Hongsong Lian, Fei Wang, Haoran Xia, Ju Tang, Yi Li","doi":"10.1049/nde2.70010","DOIUrl":"10.1049/nde2.70010","url":null,"abstract":"HFO-1336mzz(E)/CO2, an eco-friendly insulating gas, garnered considerable interest recently as a potential substitute for SF6 in gas-insulated equipment. To reduce the precipitation of fluorocarbon gases and solids during the decomposition process of HFO-1336mzz(E)/CO2 gas mixture, O2 is normally introduced as an additive. Herein, we investigated the influence of oxygen on the insulation performance of HFO-1336mzz(E)/CO2 under different electric field non-uniformities by evaluating the breakdown voltage, PDIV, PDEV and decomposition characteristics. The findings indicate that in a quasi-uniform electric field, the breakdown voltage of the gas mixture progressively increases with the oxygen volume fraction. Under the extremely non-uniform electric field, both the breakdown voltage and PDIV initially rise and subsequently decline with the increase of oxygen volume fraction, reaching a peak at 6%. The PD decomposition analysis reveals that the addition of 4% oxygen can reduce the decomposition of HFO-1336mzz(E), which is most beneficial to improve the comprehensive insulation performance of the gas mixture.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144256359","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 High-Temperature Energy Storage Properties of BOPP Capacitor Films by Coating Heterostructural Ceramics Layers 异质结构陶瓷涂层增强BOPP电容器薄膜的高温储能性能

IF 3.8

IET Nanodielectrics Pub Date : 2025-05-22 DOI: 10.1049/nde2.70009

Zhaoliang Xing, Bize Gong, Tianyuan Yin, Shaowei Guo, Bo Yang, Tiandong Zhang, Jianhong Hao

{"title":"Enhanced High-Temperature Energy Storage Properties of BOPP Capacitor Films by Coating Heterostructural Ceramics Layers","authors":"Zhaoliang Xing, Bize Gong, Tianyuan Yin, Shaowei Guo, Bo Yang, Tiandong Zhang, Jianhong Hao","doi":"10.1049/nde2.70009","DOIUrl":"10.1049/nde2.70009","url":null,"abstract":"Biaxially oriented polypropylene (BOPP), the dielectric material of choice for polymer film capacitors, is widely used in advanced electronic devices and power grids, among other applications. However, the nonlinear growth of the conduction loss at high temperatures leads to a rapid deterioration of its energy storage performance, which seriously hinders the development trend of miniaturisation and high integration of power systems. In this study, inorganic nanolayers with heterogeneous structure were grown on the surface of BOPP films by magnetron sputtering using high dielectric constant BaZrTiO3 and wide bandgap Al2O3 ceramic targets. Experimental and theoretical analyses show that the use of wide bandgap Al2O3 as the heterojunction outer layer can effectively impede carrier injection and transport, leading to a significant reduction in the leakage current density of the composite film, effectively enhancing the high temperature energy storage performance of the composite films. The synergistic enhancement of the inorganic heterojunction structure on the dielectric properties and insulating strength of the polymer film is attributed to the ability of the Al2O3/BaZrTiO3/BOPP/BaZrTiO3/Al2O3 (O-B-P-B-O) composite films to exhibit a discharge energy density of 2.49 J/cm3 and a charge/discharge efficiency of 77.6% at 125°C and 500 MV/m.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108962","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

Improved Insulation Properties of Polypropylene With Highly Orientated Lamellar Induced by NonIsothermal Shear Stress 非等温剪切应力诱导下高取向层状聚丙烯绝缘性能的改善

IF 3.8

IET Nanodielectrics Pub Date : 2025-05-08 DOI: 10.1049/nde2.70007

Lei Huang, Yan-Hui Song, Li-Juan Yin, Shao-Long Zhong, Zhi-Min Dang

引用次数: 0

Early Brain Tumour Cell Detection With High-Sensitivity Terahertz Sensors Based on Photonic Crystal Fibre 基于光子晶体光纤的高灵敏度太赫兹传感器早期脑肿瘤细胞检测

IF 3.8

IET Nanodielectrics Pub Date : 2025-04-30 DOI: 10.1049/nde2.70008

Diponkar Kundu, Md. Sohel Rana, Md. Naimur Rahman Naim, Md. Jobaier Hossain, A. H. M. Iftekharul Ferdous, Md. Safiul Islam, Md. Golam Sadeque

{"title":"Early Brain Tumour Cell Detection With High-Sensitivity Terahertz Sensors Based on Photonic Crystal Fibre","authors":"Diponkar Kundu, Md. Sohel Rana, Md. Naimur Rahman Naim, Md. Jobaier Hossain, A. H. M. Iftekharul Ferdous, Md. Safiul Islam, Md. Golam Sadeque","doi":"10.1049/nde2.70008","DOIUrl":"10.1049/nde2.70008","url":null,"abstract":"Early detection of brain tumours is crucial for timely treatment, improving survival rates, and preventing severe neurological complications. When successful procedures for early identification are applied to brain tumours, it might preserve people. The article illustrates an original biological device for finding the first signs of brain tumour cells based on photonic crystal fibre (PCF) equipment performing within the terahertz (THz) band. The suggested scanner is a helpful instrument in tumour tissue diagnosis due to its extremely sensitive nature along with minimal transmission degradation. The photonic crystal fibre's distinctive arrangement, utilised by the terahertz frequency spectrum, permits accurate classification of healthy and tumour parts according to the differences in electromagnetic features. Typical tissue in the brain contain damage, tumours, as well as cells that are cancerous. When juxtaposed with previous PCF-based biological indicators, the device that is recommended has excellent comparative response with minimal expenses. The sensing device has a relative sensitivity of 99.26%, an effective area of 4.77 × 10−8 m2, a minimal confinement loss of 9.55 × 10−6 cm−1, and a low effective material loss of 0.00219 cm−1. The findings of this investigation indicate a big step forward for biological observing equipment, providing a hopeful approach to prompt identification of brain tumours for possible commercial diagnostic possibilities.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"8 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.70008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892965","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

Evaluation of the Feasibility of Replacing SF6 With C5F10O for Gas-Insulated Switchgear From Insulation Properties 从绝缘性能评价气体绝缘开关用c5f100代替SF6的可行性

IF 3.8

IET Nanodielectrics Pub Date : 2025-04-25 DOI: 10.1049/nde2.70002

Yalong Xia, Fuxiang Li, Hua Mao, Yan Wang, Song Xiao, Yijiang Chen

引用次数: 0