Iet Science Measurement & Technology最新文献_第3页

Analysis of electric field and partial discharge characteristics of cable joint stress cone dislocation defects 电缆接头应力锥位错缺陷的电场和局部放电特性分析

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-01-30 DOI: 10.1049/smt2.12181

Yuwei Sun, Anqiang Lv, Zhiyuan Xie

{"title":"Analysis of electric field and partial discharge characteristics of cable joint stress cone dislocation defects","authors":"Yuwei Sun, Anqiang Lv, Zhiyuan Xie","doi":"10.1049/smt2.12181","DOIUrl":"10.1049/smt2.12181","url":null,"abstract":"The mechanisms governing electric field and partial discharge (PD) under stress cone dislocation remain unclear. This study employs the finite element method to explore the relationship between the electric field, externally applied voltage, and length of dislocation. Subsequently, the correlation between voltage and electric field is determined. The relationship between voltage and PD is established through PD tests conducted under stress cone dislocation conditions. By considering the influence of voltage, the association between the electric field and PD is established, revealing the mechanism of PD initiation by electric field distortion in joints. The findings suggest that the lifetime and reliability were increased by wrapping semi-conductive self-adhesive tape around the exposed cross-linked polyethylene (XLPE) insulation layer. The electric field at a specific location is approximately proportional to the applied voltage. However, the slope is influenced by the composite insulation interface and the radial distance of the copper conductor. When crossing the interface between the XLPE insulation layer and the accessory insulation layer, the slope decreases significantly. The threshold for electric field PD is determined by examining the electric field distribution and the PD inception voltage during testing. When the voltage is sufficiently high, significant electric field distortions can occur at multiple points in the joint, potentially leading to concurrent PDs at several locations.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12181","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140480904","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

A proposed method for calculating the voltage and current distributions of grounded and isolated networks subjected to line-to-ground faults 用于计算线路对地故障时接地和隔离网络的电压和电流分布的拟议方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-01-28 DOI: 10.1049/smt2.12180

Ossama. E. Gouda, Adel Z. El Dein, Wulfran F. Mbasso, Mosleh Alharthi, Sherif S. M. Ghoneim

{"title":"A proposed method for calculating the voltage and current distributions of grounded and isolated networks subjected to line-to-ground faults","authors":"Ossama. E. Gouda, Adel Z. El Dein, Wulfran F. Mbasso, Mosleh Alharthi, Sherif S. M. Ghoneim","doi":"10.1049/smt2.12180","DOIUrl":"10.1049/smt2.12180","url":null,"abstract":"One crucial objective of this article is to present simplified and accurate approaches to study the current distribution and ground surface potential around the area surrounding an earthed and isolated system in case of a line-to-earth fault. The present study is done in the case of uniform and two-layer soils. Suggested models for calculating the distribution of the earth's surface current density, step, and touch voltages in grounded and isolated systems are presented, discussed, and adapted. The contact and arc resistances of line to ground faulty conductors are considered. Rods and/or grounding grids usually do grounded systems. The impact of both step and touch potentials and current density are investigated in this article. The methods of the calculations are based on the electrical concepts, the charge simulation method, and the imaging procedure for the grounding system. The suggested method can be considered a novel and simple technique for calculating the current distributions of the ground surface during line to ground fault. The results agree with those obtained by others, with the advantage of the proposed algorithm for its ease of application and simplicity. 3-D dimensions’ contours of the current density and the electric potential on the earth surface around the faulty point are presented in case of homogeneous and two layers’ soil. Finally, this article's novelty is to devise a method for calculating the step and touch potentials and current density around the point of contact of the conductor carrying the electric voltages in the event of faults occurring in the electrical network, whether the network is grounded or isolated. Such faults of electrical networks may cause human hazards.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140491587","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

Vibration feature extraction and fault detection method for transmission towers 输电塔振动特征提取和故障检测方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-01-17 DOI: 10.1049/smt2.12179

Long Zhao, Zhicheng Liu, Peng Yuan, Guanru Wen, Xinbo Huang

{"title":"Vibration feature extraction and fault detection method for transmission towers","authors":"Long Zhao, Zhicheng Liu, Peng Yuan, Guanru Wen, Xinbo Huang","doi":"10.1049/smt2.12179","DOIUrl":"10.1049/smt2.12179","url":null,"abstract":"This paper presents a novel bolt looseness detection method for power transmission towers based on vibration signal analysis. The proposed method utilizes pulse excitation to extract the vibration signal of the tower, which is then adaptively decomposed using the Variational Mode Decomposition of Spider Wasp optimizer (SWVMD). This overcomes limitations of traditional Variational Mode Decomposition methods by leveraging bio-inspired optimization to improve signal decomposition. Simulated signals processed with different optimization methods verify the superiority of the SWO approach. Field tests on a 110-kV transmission tower further demonstrate the effectiveness of the proposed SWVMD technique for analyzing on-site vibration data. A new improved intrinsic multiscale sample entropy feature is also introduced for bolt state characterization. A Spider Wasp Support Vector Machine classifier is developed to realize accurate bolt loosening monitoring using the extracted features. Dynamic response tests under varying bolt conditions show that the method can identify early loosening and reduce tower damage risks compared to conventional techniques. This novel vibration-based detection framework presents an innovative application of nature-inspired computing for power infrastructure health monitoring.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12179","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139527409","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

Deep learning method for predicting electromagnetic emission spectrum of aerospace equipment 预测航空航天设备电磁发射频谱的深度学习方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-01-17 DOI: 10.1049/smt2.12178

Yuting Zhang

{"title":"Deep learning method for predicting electromagnetic emission spectrum of aerospace equipment","authors":"Yuting Zhang","doi":"10.1049/smt2.12178","DOIUrl":"10.1049/smt2.12178","url":null,"abstract":"This paper proposes a deep learning method to predict the electromagnetic emission spectrum in the electromagnetic compatibility (EMC) test of aerospace products. A threshold-based data decomposition method is used to propose the spike signal, reconstruct the original test data, and solve the contradiction between the overfitting and prediction accuracy of the deep learning method to deal with the EMC test spectrum. Using a long short-term memory neural network architecture for predicting electromagnetic emission spectrum, the Bayesian optimization method is used to optimize the network hyperparameter, and the acquisition function is introduced into the loss function to improve the comprehensive training optimization of deep learning network. Apply the method to three numerical examples: signal line current conduction emission, power line voltage conduction emission, and electric field radiation emission. The analysis results indicate that at a 95% confidence level, the predicted electromagnetic emission spectrum is basically consistent with the test results. The prediction results can be used as the basis for EMC evaluation of aerospace electronic equipment.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12178","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617368","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

Application status and development trend of intelligent sensor technology in the electric power industry 智能传感器技术在电力行业的应用现状和发展趋势

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-01-16 DOI: 10.1049/smt2.12175

Peng Li, Youping Fan, Zhong Liu, Bing Tian, Zhiming Wang, Dongjie Li, Zixi Han, Zhaoyi Zhang, Feng Xiong

{"title":"Application status and development trend of intelligent sensor technology in the electric power industry","authors":"Peng Li, Youping Fan, Zhong Liu, Bing Tian, Zhiming Wang, Dongjie Li, Zixi Han, Zhaoyi Zhang, Feng Xiong","doi":"10.1049/smt2.12175","DOIUrl":"10.1049/smt2.12175","url":null,"abstract":"With the rapid development of digital technologies such as intelligent control and information communication, digitization has gradually become an inevitable trend to promote technology innovation and industrial upgrading for the power grid. As the basis of digital technology, digital sensing technology will gradually penetrate all aspects of the power system for comprehensive perception and high operational reliability. First, this article introduces the application status and technical requirements of power intelligent sensor technology in various aspects of the power system, including the generation, transmission, transformation, distribution, and consumption of electricity. Next, domestic and foreign scholars' latest research achievements in power sensing technology are described from three major aspects, that is, optical fiber sensing technology, MEMS sensing technology, and sensor self-powered technology. Finally, future challenges for the electric power intelligent sensors are discussed and an outlook of future widespread application in the clean, safe, and efficient digital power grid is provided.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139618452","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

Pre-insertion resistors temperature prediction based on improved WOA-SVR 基于改进型 WOA-SVR 的插入前电阻器温度预测

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2024-01-13 DOI: 10.1049/smt2.12177

Honghe Dai, Site Mo, Haoxin Wang, Nan Yin, Songhai Fan, Bixiong Li

{"title":"Pre-insertion resistors temperature prediction based on improved WOA-SVR","authors":"Honghe Dai, Site Mo, Haoxin Wang, Nan Yin, Songhai Fan, Bixiong Li","doi":"10.1049/smt2.12177","DOIUrl":"10.1049/smt2.12177","url":null,"abstract":"The pre-insertion resistors (PIR) within high-voltage circuit breakers are critical components and warm up by generating Joule heat when an electric current flows through them. Elevated temperature can lead to temporary closure failure and, in severe cases, the rupture of PIR. To accurately predict the temperature of PIR, this study combines finite element simulation techniques with Support Vector Regression (SVR) optimized by an Improved Whale Optimization Algorithm (IWOA) approach. The IWOA includes Tent mapping, a convergence factor based on the sigmoid function, and the Ornstein–Uhlenbeck variation strategy. The IWOA-SVR model is compared with the SSA-SVR and WOA-SVR. The results reveal that the prediction accuracies of the IWOA-SVR model were 90.2% and 81.5% (above 100°C) in the ± 3°C temperature deviation range and 96.3% and 93.4% (above 100°C) in the ± 4°C temperature deviation range, surpassing the performance of the comparative models. This research demonstrates that the method proposed can realize the online monitoring of the temperature of the PIR, which can effectively prevent thermal faults PIR and provide a basis for the opening and closing of the circuit breaker within a short period.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12177","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139536000","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

Condition assessment criteria evaluation of asymmetric aged and fully aged silicone rubber insulators based on leakage current harmonics 基于泄漏电流谐波的非对称老化和完全老化硅橡胶绝缘子的状态评估标准评价

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-12-28 DOI: 10.1049/smt2.12176

Mehdi Esmaieli, Masume Khodsuz, Hassan Nouri

{"title":"Condition assessment criteria evaluation of asymmetric aged and fully aged silicone rubber insulators based on leakage current harmonics","authors":"Mehdi Esmaieli, Masume Khodsuz, Hassan Nouri","doi":"10.1049/smt2.12176","DOIUrl":"10.1049/smt2.12176","url":null,"abstract":"The leakage current characteristic monitoring of transmission line insulators is considered a worthy technique for insulator state prediction. In this paper, the harmonic analysis of leakage current signals has been performed to analyze the composite insulator condition. Experimental studies of asymmetrically aged, fully aged, and virgin insulators have been conducted. The effects of different aging types, pollution, and humidity on leakage current components, such as harmonics and the phase differences with the applied voltage, have been investigated. The analysis of the results shows that the effect of asymmetric aging on leakage current components is non-linear, and this non-linearity increases with the degree of pollution. Also, the type of insulator aging can be determined by the ratio of the third- and fifth-order leakage current harmonics. For instance, the classification of insulators into virgin, asymmetrically aged, and fully aged can be determined by examining the corresponding value ranges of 0–0.5, 0.5–0.9, and > 0.9, respectively. Similarly, the phase difference values of < 15% and those > 15% indicate the clean and polluted operating conditions individually.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139150462","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 effects of large round-off errors on the performance of control charts for the mean when the quality characteristic is normally distributed with a known variance 当质量特性呈正态分布且方差已知时，大四舍五入误差对均值控制图性能的影响

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-12-22 DOI: 10.1049/smt2.12171

Benson-Karhi Diamanta, Ben-David Michal, Levi Ofer, Schechtman Edna

{"title":"The effects of large round-off errors on the performance of control charts for the mean when the quality characteristic is normally distributed with a known variance","authors":"Benson-Karhi Diamanta, Ben-David Michal, Levi Ofer, Schechtman Edna","doi":"10.1049/smt2.12171","DOIUrl":"10.1049/smt2.12171","url":null,"abstract":"This research discusses the effects of large round-off errors on the performance of control charts for means when a process is normally distributed with a known variance and a fixed sample size. Quality control in practice uses control charts for means as a process monitoring tool, even when the data is significantly rounded. The objective of this research is to demonstrate how ignoring the round-off errors and using a standard Shewhart chart affects the quality control of a measured process. The first part of the research includes theoretical calculations for estimating the values of alpha and beta, relating to the unrounded data and the large-rounded data. For the rounded data, normality can no longer be assumed because the data is discrete; therefore, the multinomial distribution is used. The results show that given an in-control process, alpha indicates that false alarms are more frequent, whereas given an out-of-control process, the influence on beta is minor and inconsistent. For some rounding levels, there is a decline in the control chart performances, and in others, there is an improvement. In the second part, a simulation study is used to evaluate the performances of the control chart based on a single sample, checking whether the conclusion (reject or fail to reject) for a sample is consistent for rounded and unrounded data. The results of the simulation match the theoretical calculations.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12171","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139163680","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

Asymmetric calibration method on a back-to-back double-loop differential magnetic field probe 背靠背双环差分磁场探头的非对称校准方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-12-13 DOI: 10.1049/smt2.12172

Xiao He, Lijuan Huang, Dezhi Zeng, Bo Hou, Yuan Chi, En Li

引用次数: 0

Analysis of leakage flux, losses, and temperature in large synchronous generator end zone under the multi-layer screen thickness based on novel iterative method 基于新型迭代法的多层滤网厚度下大型同步发电机端区漏磁通、损耗和温度分析

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-11-22 DOI: 10.1049/smt2.12161

Jichao Han, Jiayu Qiu, Mingxuan Teng, Haiming Qi, Baojun Ge

{"title":"Analysis of leakage flux, losses, and temperature in large synchronous generator end zone under the multi-layer screen thickness based on novel iterative method","authors":"Jichao Han, Jiayu Qiu, Mingxuan Teng, Haiming Qi, Baojun Ge","doi":"10.1049/smt2.12161","DOIUrl":"https://doi.org/10.1049/smt2.12161","url":null,"abstract":"The multi-layer screen is the key component in the large synchronous generator end zone. The leakage flux, losses, and temperature of end components are significantly affected by the thickness of multi-layer screen in the synchronous generator. To investigate the influence of multi-layer screen thickness on the end leakage flux, losses, and temperature in the synchronous generator end zone, 1407MVA nuclear power synchronous generator is studied. Three-dimensional transient electromagnetic field model of synchronous generator end zone is established. Three-dimensional transient electromagnetic field in the end zone of 1407MVA synchronous generator with the multi-layer screen is calculated based on the novel iterative method. The flux density of end components is compared and studied in the end zone under the variation of multi-layer screen thickness. Influence of the different thicknesses of multi-layer screen on the losses of the shield plate, screen, finger plate, and stator end core is researched. The losses of end components obtained from 3D end electromagnetic field calculation are applied to the end zone as the heat source in the three-dimensional fluid and thermal coupled field. The temperature distribution of the end components is determined. The accuracy of the calculated results is validated by the experimental values.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12161","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139101148","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