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

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

Predicting the coupling of HPEM waveform with a power amplifier in perforated conductive enclosure using FDDM/VF 使用 FDDM/VF 预测穿孔导电外壳中 HPEM 波形与功率放大器的耦合情况

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-03-15 DOI: 10.1049/smt2.12189

Ali Kalantarnia, Abdollah Mirzabeigi

{"title":"Predicting the coupling of HPEM waveform with a power amplifier in perforated conductive enclosure using FDDM/VF","authors":"Ali Kalantarnia, Abdollah Mirzabeigi","doi":"10.1049/smt2.12189","DOIUrl":"10.1049/smt2.12189","url":null,"abstract":"One of the most common methods to protect electronic and telecommunication systems in a high-power electromagnetic (HPEM) environment is using a conductive enclosure. Amplifiers are the vital parts in transmitter and receiver systems as the main components of a telecommunication system, so investigating the effects of HPEM waveform on their performance is very important. The Presence of apertures in the body of the conductive enclosure, as well as non-linear elements such as transistors in amplifiers, adds to the complexity of examining the coupling of electromagnetic fields on the performance of amplifiers. Considering the importance of the topic, in this study, the impact of the HPEM waveform on the power amplifier inside the conductive enclosure has been investigated. By using the finite difference delay modelling (FDDM) numerical method as a stable method followed by the vector fitting (VF) method, the electromagnetic problem has become a circuit problem, which allows examining the response of the power amplifier and any circuit, including non-linear elements against the interference field. Responses of bipolar linear and non-linear components in the perforated conductive enclosure by the proposed method have been compared with the results obtained by computer simulation technology microwave studio (CST-MWS) for verification.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 8","pages":"429-442"},"PeriodicalIF":1.4,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12189","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140239206","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

Front Cover: Equivalent transmission line characterization and multi-layer material measurement analysis of the signal conversion process in the pulsed electro-acoustic method 封面：脉冲电声法信号转换过程的等效传输线特性分析和多层材料测量分析

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-03-13 DOI: 10.1049/smt2.12188

Hanwen Ren, Siyang Zhao, Jian Mu, Haoyu Gao, Tianrun Qi, Zhiyun Han, Zhihui Li, Qingmin Li

引用次数: 0

Enhanced complex wire fault diagnosis via integration of time domain reflectometry and particle swarm optimization with least square support vector machine 通过时域反射测量和粒子群优化与最小平方支持向量机的集成，增强复杂导线故障诊断能力

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-03-07 DOI: 10.1049/smt2.12187

Abderrzak Laib, Mohamed Chelabi, Yacine Terriche, Mohammed Melit, Hamza Boudjefdjouf, Hafiz Ahmed, Zakaria Chedjara

{"title":"Enhanced complex wire fault diagnosis via integration of time domain reflectometry and particle swarm optimization with least square support vector machine","authors":"Abderrzak Laib, Mohamed Chelabi, Yacine Terriche, Mohammed Melit, Hamza Boudjefdjouf, Hafiz Ahmed, Zakaria Chedjara","doi":"10.1049/smt2.12187","DOIUrl":"https://doi.org/10.1049/smt2.12187","url":null,"abstract":"Urban power systems rely on intricate wire networks, known as the power grid, which form the essential electric infrastructure in cities. While these networks transmit electricity from power plants to consumers, they are vulnerable to faults caused by manufacturing errors and improper installation, posing risks to system integrity. Thus, accurate identification and assessment of these faults are crucial to prevent damage and maintain system reliability. The objective of this research is to present an innovative and efficient methodology for diagnosing complex wire networks through the application of time domain reflectometry (TDR) combined with the particle swarm optimization (PSO) and least squares support vector machine (LSSVM) algorithm. This research addresses the imperative need to accurately locate and assess breakage faults within wire networks, emphasizing their role in both power transmission and communication infrastructure. To model the TDR answer of a specific complex wire network, a forward model is established utilizing resistance, inductance, capacitance and conductance (RLCG) parameters and the finite difference time domain (FDTD) method. Subsequently, the PSO-LSSVM approach is used to solve the inverse problem of localizing faults in complex wire networks. The experimental results validate the practicality of this approach in real-world systems.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 8","pages":"417-428"},"PeriodicalIF":1.4,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142429289","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