Iet Science Measurement & Technology最新文献_第4页

Thermal behaviour of a transformer mineral oil-tank surface under incipient turn-to-turn short-circuit fault 变压器矿物油箱表面在初期匝间短路故障下的热特性

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-06-10 DOI: 10.1049/smt2.12200

Si Chen, Yingting Luo, Gehao Sheng, Junfei Jiang

{"title":"Thermal behaviour of a transformer mineral oil-tank surface under incipient turn-to-turn short-circuit fault","authors":"Si Chen, Yingting Luo, Gehao Sheng, Junfei Jiang","doi":"10.1049/smt2.12200","DOIUrl":"10.1049/smt2.12200","url":null,"abstract":"A slight turn-to-turn short-circuit fault in the incipient stage does not trigger fuse protection, and the regular transmission and transformation functions of the transformer within the power grid are not affected very much by the incipient turn-to-turn short-circuit fault. Therefore, the incipient turn-to-turn short-circuit faults are often undetected, resulting in massive accidents. Incipient turn-to-turn short-circuit faults lead to localized overheating in the transformer, which changes the transformer's oil-tank surface temperature (OTST). A thermal simulation model (TSM) is presented. Based on the TSM, OTST data with different load rates and fault parameters are collected. The steady-state and transient characteristics of OTST are analysed by extracting the OTST feature vector and the temperature difference of specific regions. The results show that the growth of the heat production value of faulty coils causes a rise in the OTST; higher faulty coils' locations lead to wider OTST differences; the temperature difference's area S can follow the incipient short-circuit fault in the first 20 min after it occurs, which is faster than the top oil temperature. This study gives insight into the thermal behaviour of OTST, assisting in fault detection and location at the incipient fault stage.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 6","pages":"310-323"},"PeriodicalIF":1.4,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12200","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141365584","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

Robust adaptive non-linear alignment algorithm for SINS/DVL integrated navigation system based on variational Bayesian 基于变异贝叶斯的 SINS/DVL 集成导航系统鲁棒自适应非线性对齐算法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-06-10 DOI: 10.1049/smt2.12198

Bing Zhu, Jingshu Li, Guoheng Cui, Zuohu Li, Ge Tian, Xia Guo

{"title":"Robust adaptive non-linear alignment algorithm for SINS/DVL integrated navigation system based on variational Bayesian","authors":"Bing Zhu, Jingshu Li, Guoheng Cui, Zuohu Li, Ge Tian, Xia Guo","doi":"10.1049/smt2.12198","DOIUrl":"10.1049/smt2.12198","url":null,"abstract":"The problem of dynamic attitude alignment for strapdown inertial navigation system (SINS) and Doppler velocity log (DVL) integrated navigation has become a research hotspot. Underwater complex environment makes DVL output vulnerable to non-Gaussian noise pollution, which makes it difficult to converge the SINS misalignment angle to within 1° based on analytical coarse alignment. This is to say, the performance of SINS fine alignment via Kalman filter will be degraded because the model of initial alignment exhibits non-linearity. The inaccurate and/or unknown prior information of measurement noise statistical characteristics will also degrade the filtering performance. To ensure the SINS/DVL alignment accuracy under non-linear, non-Gaussian and uncertain conditions, this paper proposed a robust adaptive unscented Kalman filter (UKF) based on Variational Bayesian (VB) method (VBRAUKF). The proposed VBRAUKF improves the adaptability and robustness of UKF from the following two main aspects. Firstly, an adaptive estimation strategy for the measurement noise covariance is designed based on the VB algorithm, which can restrain the effect of inaccurate observation model and improve the adaptive ability of the filtering method. Secondly, an expansion factor is designed based on Mahalanobis distance algorithm, which can restrain the effect of non-Gaussian noise and improve the robustness of the filtering method. The experimental results for the problem of the SINS/DVL dynamic alignment under mixed Gaussian noise and/or outlier conditions demonstrate the superiority of the proposed VBRAUKF over the traditional ones.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 9","pages":"455-470"},"PeriodicalIF":1.4,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12198","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141360987","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

Simultaneous electromagnetic field probing system with Y-shaped separation detection structure 具有 Y 型分离探测结构的同步电磁场探测系统

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-05-29 DOI: 10.1049/smt2.12201

Jianke Li, Shan Xue, Chengyang Luo, Zongqi Cai, Yan Chen, Yuan Chi

{"title":"Simultaneous electromagnetic field probing system with Y-shaped separation detection structure","authors":"Jianke Li, Shan Xue, Chengyang Luo, Zongqi Cai, Yan Chen, Yuan Chi","doi":"10.1049/smt2.12201","DOIUrl":"https://doi.org/10.1049/smt2.12201","url":null,"abstract":"Simultaneous electromagnetic field probing system (SEMPS) has been popular in recent years. Herein, a simultaneous electromagnetic field probing system with Y-shaped separation detection structure (SEMPS Y) is first proposed, in which the electric field probing region and the magnetic field probing region of the probe are separated by completely covering the shield along the loop and adding a pin-shaped metal wire to capture the electric field, which are not the same as the classical dual probe structure. Combined with the non-rotating asymmetric calibration method (NRACM), a 4-port vector network analyser (VNA) and a highly symmetric grounded coplanar waveguide (GCPW) calibrator are used to solve the calibration matrix of the asymmetric SEMPS Y. The high symmetry GCPW calibrator is used to generate the standard electromagnetic field for calibration. The results of standing wave measurements show that the SEMPS Y can achieve ultrawideband electromagnetic field measurement of up to 20 GHz. Based on near-field scanning measurements, SEMP Y can obtain results consistent with the calculation. In addition, when the probe is rotated 90° to invalidate the H-field input, the decoupling curves of E-field and H-field are measured. Results show that the separation detection structure can effectively solve the cross-coupling problem.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 7","pages":"325-333"},"PeriodicalIF":1.4,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12201","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160187","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

Experimental verification of temperature effects on functional parameters in a line start permanent magnet synchronous motor 温度对线路启动永磁同步电机功能参数影响的实验验证

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-05-29 DOI: 10.1049/smt2.12206

Mariusz Baranski, Andrzej Demenko, Wojciech Szelag, Wieslaw Lyskawinski

引用次数: 0

Multimodal imbalanced-data fault diagnosis method based on a dual-branch interactive fusion network 基于双分支交互式融合网络的多模态不平衡数据故障诊断方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-05-24 DOI: 10.1049/smt2.12205

Jing He, Ling Yin, Zhenwen Sheng

{"title":"Multimodal imbalanced-data fault diagnosis method based on a dual-branch interactive fusion network","authors":"Jing He, Ling Yin, Zhenwen Sheng","doi":"10.1049/smt2.12205","DOIUrl":"https://doi.org/10.1049/smt2.12205","url":null,"abstract":"Bearing-fault diagnosis in rotating machinery is essential for ensuring the safety and reliability of mechanical systems. However, under complicated working conditions, the number of normal mechanical equipment samples can far exceed the number of faulty ones. When the data are so imbalanced, data fault diagnosis cannot be easily conducted using conventional deep learning methods. This study proposes a fault diagnosis method based on a dual-branch interactive fusion network, which improves the accuracy and stability of bearing-fault diagnosis. First, a dual-branch feature representation network comprising an iterative attention-feature fusion residual neural network and a long short-term memory network is designed for extracting different modal features. Meanwhile, intermodal fusion of the extracted features is performed through multilayer perception. Based on the cost-sensitive regularization loss, a new joint loss function is then designed for network training. Finally, the effectiveness of the proposed method is verified through comparative experiments, visualization analyses, ablation experiments, and generalization performance experiments.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"18 7","pages":"373-384"},"PeriodicalIF":1.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12205","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160204","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

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