Iet Science Measurement & Technology最新文献_第5页

Analysis of electrical contact characteristics of strap contacts used in high voltage bushings under eccentric conditions 偏心条件下高压套管中使用的带状触头电气接触特性分析

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-05-24 DOI: 10.1049/smt2.12202

Qingyu Wang, Xiaoyu Zhou, Wei Yang, Di Hu, Shoufeng Jin, Tao Xie, Peng Liu, Zongren Peng

{"title":"Analysis of electrical contact characteristics of strap contacts used in high voltage bushings under eccentric conditions","authors":"Qingyu Wang, Xiaoyu Zhou, Wei Yang, Di Hu, Shoufeng Jin, Tao Xie, Peng Liu, Zongren Peng","doi":"10.1049/smt2.12202","DOIUrl":"10.1049/smt2.12202","url":null,"abstract":"The contact finger electrical connection structure is a crucial component of high voltage bushings, and its safety and reliability directly impact the operational stability of the bushing. To investigate electrical contact performance of the contact finger under eccentric conditions, a three-dimensional electrical, thermal, and force multi-physics coupling calculation model was established. Additionally, a test platform was constructed to measure electrical contact characteristics of the contact finger. The contact characteristics of the contact finger when the male head was axially deflected and radially offset compared to the female head were obtained. The research findings indicate when the male head deflects axially, the contact force changes of the contact finger blades on both sides are opposite. Moreover, as the axial deflection angle of the male head increases, the resistance of the electrical connection structure shows a rising-slow decreasing-fluctuating trend. The resistance is highest at 3°, with a resistance increase rate of 7.35%. Furthermore, the resistance of the electrical connection structure varies with the radial offset of the male head, following a power function. Contact failure occurs when the radial offset is 1.31 mm, and the resistance increase rate reaches 24.9% at a radial offset of 1.58 mm.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 7","pages":"334-348"},"PeriodicalIF":1.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12202","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141101466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatiotemporal energy-density distribution of time-reversed electromagnetic fields 时逆电磁场的时空能量密度分布

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-04-29 DOI: 10.1049/smt2.12196

Elias Le Boudec, Hamidreza Karami, Nicolas Mora, Farhad Rachidi, Marcos Rubinstein, Felix Vega

{"title":"Spatiotemporal energy-density distribution of time-reversed electromagnetic fields","authors":"Elias Le Boudec, Hamidreza Karami, Nicolas Mora, Farhad Rachidi, Marcos Rubinstein, Felix Vega","doi":"10.1049/smt2.12196","DOIUrl":"https://doi.org/10.1049/smt2.12196","url":null,"abstract":"Time reversal exploits the invariance of electromagnetic wave propagation in reciprocal and lossless media to localize radiating sources. Time-reversed measurements are back-propagated in a simulated domain and converge to the unknown source location. The focusing time (i.e. the simulation instant at which the fields converge to the source location) and the source location can be identified using field maxima, entropy, time kurtosis, and space kurtosis. This paper analyses the spatial energy-density distribution of time-reversed electromagnetic fields by introducing a convergence metric based on the spatial average and variance of the energy density. It is analytically proven that the proposed metric identifies the focusing time and the source location, with direct links to the source frequency content. The analytical results are verified in a free-space numerical simulation and the proposed metric is then compared to existing ones in a simulated inhomogeneous medium. Next, this metric is applied and compared in an experimental case study to localize electromagnetic interference sources. The proposed metric outperforms existing ones to identify the focusing time and can also be used to locate the source. Finally, because of its tensorial nature, it can handle anisotropic media, opening the door to quantitative analyses of time-reversal focusing in metamaterials.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 9","pages":"629-640"},"PeriodicalIF":1.4,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12196","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of temperature on partial discharges activity and electrical trees propagation in XLPE 温度对 XLPE 中局部放电活动和电树传播的影响

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-04-23 DOI: 10.1049/smt2.12199

Yan Li, Guancheng Zhen, Yifan Liu, Haoyuan Song, Yuwei Liang, Xiaokun Liu, Shaoxin Meng, Yan Liu, Shasha Li

{"title":"Effect of temperature on partial discharges activity and electrical trees propagation in XLPE","authors":"Yan Li, Guancheng Zhen, Yifan Liu, Haoyuan Song, Yuwei Liang, Xiaokun Liu, Shaoxin Meng, Yan Liu, Shasha Li","doi":"10.1049/smt2.12199","DOIUrl":"10.1049/smt2.12199","url":null,"abstract":"Cross-linked polyethylene (XLPE) cables are commonly used for constructing urban power lines due to their superior properties. Insulation defects can cause partial discharge (PD) and electrical tree, which can negatively impact the insulation performance of the cable and even lead to insulation failure. During operation, cables undergo hot and cold cycles, and the temperature of the insulation layer can affect the PD and electrical tree. An experimental platform with a needle-plate electrode was developed to investigate this phenomenon. The platform was used to detect PD activity and electrical tree propagation in XLPE under a 50 Hz voltage at various temperatures. The results indicate that an increase in insulation temperature leads to an increase in the number of PDs and a decrease in the inception voltage. Simultaneously, it has been observed that a rise in temperature can facilitate the spread of electrical trees. To explicate the aforementioned PD result, a finite element analysis (FEA) model has been developed. Additionally, a molecular dynamics (MD) model of XLPE material was developed to clarify the phenomenon of electrical tree propagation. This study's findings aid in investigating the impact of temperature on XLPE defects, which is critical for assessing power cable performance.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 6","pages":"300-309"},"PeriodicalIF":1.4,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12199","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140667245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 time reversal for online partial discharge location in power cables: Influence of interfering reflections from grid components 用于电力电缆局部放电在线定位的电磁时间反转：电网元件干扰反射的影响

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-04-16 DOI: 10.1049/smt2.12197

Antonella Ragusa, Peter A. A. F. Wouters, Hugh Sasse, Alistair Duffy, Farhad Rachidi, Marcos Rubinstein

{"title":"Electromagnetic time reversal for online partial discharge location in power cables: Influence of interfering reflections from grid components","authors":"Antonella Ragusa, Peter A. A. F. Wouters, Hugh Sasse, Alistair Duffy, Farhad Rachidi, Marcos Rubinstein","doi":"10.1049/smt2.12197","DOIUrl":"10.1049/smt2.12197","url":null,"abstract":"In online single-sided partial discharge (PD) location, the measured PD reflection patterns are affected by the characteristics of all the components of the associated power network. This paper analyses the performance of a PD location method based on electromagnetic time reversal (EMTR) theory, when interfering reflections contribute to the transient signals emitted by the PD event. The topology analysed is formed from a ring main unit (RMU) in a medium voltage grid with mixed cross-linked polyethylene and paper-insulated lead-covered (PILC) cable sections. The PD reflection patterns, observed at the RMU, are disturbed by the reflections coming from the impedance discontinuities of the circuit and by the reflections coming from the cable ends of the PILC cables connected to the RMU. The simulated configuration is chosen such that classical location techniques tend to fail due to overlapping peaks and other signal distortion. This is because the classic techniques are based on identifying individual reflection peaks from which the PD source can be determined via differences in time of arrival. The numerical investigation shows that the accuracy of the EMTR-based location method is robust against these effects, achieving a PD localisation with an error less than the 0.1%. The results also show that the EMTR-based method can localise PDs using a PD monitoring point located somewhere along the network and not necessarily at the line termination.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 9","pages":"641-648"},"PeriodicalIF":1.4,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12197","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140694705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and application of a power frequency electric field measuring device for a high-humidity environment 高湿度环境下的工频电场测量装置的设计与应用

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-04-09 DOI: 10.1049/smt2.12195

Yemao Zhang, Guangzhou Zhang, Zhihui Feng, Ni Li, Jianben Liu, Lijian Ding, Xiong Wu

{"title":"Design and application of a power frequency electric field measuring device for a high-humidity environment","authors":"Yemao Zhang, Guangzhou Zhang, Zhihui Feng, Ni Li, Jianben Liu, Lijian Ding, Xiong Wu","doi":"10.1049/smt2.12195","DOIUrl":"10.1049/smt2.12195","url":null,"abstract":"The power frequency electric field is the most important electromagnetic environmental factor in alternating current power transmission projects. The humidity has a negative influence on available electric field measuring devices, which may lead to discrepancies of up to seven times the actual value at a relative humidity exceeding 80%. The changes in the support and probe shell impedance may be the reason for the error. The optimization measures include modifying the communication mode, designing a suitable structure and circuit for the probe, and using composite insulating material with strong hydrophobicity for the support. A three-axis omnidirectional electric field measuring device was developed based on wireless communication and composite support. The variation of the measured electric field strength value is less than 1% at relative humidities ranging from 45% to 90% in the laboratory, and the measured results obtained in high humidity at the high-voltage test site and under the transmission line demonstrated high accuracy. The research demonstrates that the composite support can be used to improve the performance of conventional devices. The proposed device can better meet the needs for accurate measurement of electric field strength in a high-humidity environment and overcome the technical problems raised by the IEC standard.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 6","pages":"289-299"},"PeriodicalIF":1.4,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12195","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140723954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wave propagation in finite discrete chains unravelled by virtual measurement of dispersion properties 通过虚拟测量频散特性揭示有限离散链中的波传播规律

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-03-27 DOI: 10.1049/smt2.12193

Zixin Wang, Guoqin He, Yichen Wang, Jiangwei Fan, Yumeng Zhang, Yisheng Chai, Dashan Shang, Sigma-Jun Lu

{"title":"Wave propagation in finite discrete chains unravelled by virtual measurement of dispersion properties","authors":"Zixin Wang, Guoqin He, Yichen Wang, Jiangwei Fan, Yumeng Zhang, Yisheng Chai, Dashan Shang, Sigma-Jun Lu","doi":"10.1049/smt2.12193","DOIUrl":"10.1049/smt2.12193","url":null,"abstract":"Travelling waves in circuit chains are studied to measure continuous dispersion. A lock-in frequency meter (LIF) is suitable for precisely determining k for each set <math>\u0000 <semantics>\u0000 <mi>ω</mi>\u0000 <annotation>$omega $</annotation>\u0000 </semantics></math> of waves in finite alternate LC chains, where LIF has been proven to be more accurate than the fast Fourier transform. In addition to the <math>\u0000 <semantics>\u0000 <mi>ω</mi>\u0000 <annotation>$omega $</annotation>\u0000 </semantics></math>–k measurement, the wave impedance spectrum of the travelling wave can be measured simultaneously, for investigating the dispersion and splitting of pulse propagation. The measured dispersion is validated to be consistent with the derived theoretical equations. The result provides an independent way to precisely obtain dynamical system properties for chains composed of non-ideal components, such as resistors for researching non-Hermitian behaviour under dissipation. Systematical mapping of relative deviation dependence of wave dispersion measurement with LIF on different chain length and component variation is studied, indicating boundaries of 1%, 0.1%, and 0.01% precision for guidance of experiments.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 6","pages":"280-288"},"PeriodicalIF":1.4,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12193","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140375460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experiment sorting of non-ferrous metals by new orientation of magnetic disk separator 利用磁盘分离机的新方向进行有色金属分拣实验

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-03-26 DOI: 10.1049/smt2.12192

Kadri Nadjib, Ahmed Nour El Islam Ayad, Ahmet Fevzi Bozkurt, Kadir Erkan, Muhannad Alshareef, Enas Ali, Reagan Jean Jacques Molu, Sherif S. M. Ghoneim

{"title":"Experiment sorting of non-ferrous metals by new orientation of magnetic disk separator","authors":"Kadri Nadjib, Ahmed Nour El Islam Ayad, Ahmet Fevzi Bozkurt, Kadir Erkan, Muhannad Alshareef, Enas Ali, Reagan Jean Jacques Molu, Sherif S. M. Ghoneim","doi":"10.1049/smt2.12192","DOIUrl":"10.1049/smt2.12192","url":null,"abstract":"Eddy-current technique has been used in several industrial applications, such as non-destructive testing and characterization, transmission systems, and separation processes. The main advantage of other separation techniques for eddy current separation is the absence of direct contact and do not use other liquid and water. This paper presents a novel configuration for a single-disk vertical eddy current separator, covered by alternating permanent magnets. Unlike several other works, which employ a horizontal orientation for magnetic disks. The advantage is that it contains one driving motor, few strong permanent magnets, and a small size and simpler construction than the usual eddy-current separators. In this work, the analysis of an eddy current separator with magnetic single disk using a numerical model based on finite element method, the obtained partial differential equation is done into the numeric solver. The experimental device was realized to separate two kinds of non-ferrous waste: aluminium and copper. The experiment results show the effect of speed variation, metals size, and kind of metal on ejection distance.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 8","pages":"443-452"},"PeriodicalIF":1.4,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12192","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140378155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Noncontact estimation of the onset of ice accretion in turbofan stators 非接触式估算涡轮风扇定子中开始结冰的时间

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-03-26 DOI: 10.1049/smt2.12191

Khalid Saleh, John Leis, David Buttsworth

{"title":"Noncontact estimation of the onset of ice accretion in turbofan stators","authors":"Khalid Saleh, John Leis, David Buttsworth","doi":"10.1049/smt2.12191","DOIUrl":"10.1049/smt2.12191","url":null,"abstract":"The problem of crystal ice formation inside aircraft turbine engines is well-documented, and poses a significant risk to safety. The problem is not only one of power loss in flight, but the very real possibility that a flame-out event could occur due to ice accretion on compressor stators, with potentially catastrophic outcomes. Although many instrumentation systems have been developed for wing ice detection, incipient formation of crystal ice is somewhat more difficult to detect. This is compounded by the need for a noncontact sensor which is robust to in-flight conditions. This paper proposes an approach to the detection of ice formation based on microwave transmission characteristics across the first and possibly the second stage of the compressor stator. It is shown that noncontact detection is feasible under realistic conditions. The contribution of this paper is twofold. First, the microwave transmission approach is motivated using wind tunnel measurements, and appropriate frequency bands are determined. Next, a signal processing approach involving higher-order analysis of time-frequency distribution characteristics is then put forward. Experimental results are presented to support the hypothesis that multiband detection offers a workable approach to the incipient crystal-ice detection problem.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 6","pages":"271-279"},"PeriodicalIF":1.4,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12191","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140379516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 hybrid algorithms in constrained optimization of the permanent magnet motors 永磁电机约束优化中的混合算法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-03-19 DOI: 10.1049/smt2.12185

Łukasz Knypiński, Ramesh Devarapalli, Frederic Gillon

引用次数: 0

Gradient-based eigenvalue optimization for electromagnetic cavities with built-in mode matching 基于梯度的特征值优化，用于具有内置模式匹配功能的电磁腔

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-03-17 DOI: 10.1049/smt2.12190

Anna Ziegler, Robert Hahn, Victoria Isensee, Anh Duc Nguyen, Sebastian Schöps

引用次数: 0