Iet Science Measurement & Technology最新文献_第9页

A physical model for the calculation of the corona onset voltage gradient of AC spacers 计算交流间隔棒电晕起始电压梯度的物理模型

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-07-17 DOI: 10.1049/smt2.12151

Shilong Huang, Jie Mao, Xiaoliang Yan, Weiye Xue, Zhongyuan Zhang, Liang Xie, Yunpeng Liu

{"title":"A physical model for the calculation of the corona onset voltage gradient of AC spacers","authors":"Shilong Huang, Jie Mao, Xiaoliang Yan, Weiye Xue, Zhongyuan Zhang, Liang Xie, Yunpeng Liu","doi":"10.1049/smt2.12151","DOIUrl":"https://doi.org/10.1049/smt2.12151","url":null,"abstract":"By correcting the photon area factor (PAF) to suit the structure of the spacer and redefining the effective ionization region of the process of negative corona onset, a physical model for the calculation of COG of AC spacers is established. The validity and practicability of the established physical model are validated by the corona onset test results of spacers in both low-altitude and high-altitude areas. The numerical results pertaining to PAF and effective ionization region are consistent with the theoretical analysis. With the established physical model as a basis, the COG of the spacer is calculated under different geometrical structure parameters and ambient conditions. The results imply that changing the curvature of the spacer edge has a more significant impact on the COG of the AC spacer than changing the curvature of the spacer end and thickness H. The decrease in the length of the ionization region and the rapid attenuation of spatial electric field intensity of the spacer with smaller geometric parameters lead to an increase in the COG.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 7","pages":"269-276"},"PeriodicalIF":1.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50144733","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

Rolling bearing fault diagnosis based on generalized multiscale mean permutation entropy and GWO-LSSVM 基于广义多尺度均值排列熵和GWO-LSSVM的滚动轴承故障诊断

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-06-03 DOI: 10.1049/smt2.12149

Li Liu, Zijin Liu, Xuefei Qian

{"title":"Rolling bearing fault diagnosis based on generalized multiscale mean permutation entropy and GWO-LSSVM","authors":"Li Liu, Zijin Liu, Xuefei Qian","doi":"10.1049/smt2.12149","DOIUrl":"https://doi.org/10.1049/smt2.12149","url":null,"abstract":"Faults in rolling bearings are usually observed through pulses in the vibration signals. However, due to the influence of complex background noise and interference from other machine components present in measurement equipment, vibration signals are typically non-stationary and often contaminated by noise. Therefore, in order to effectively extract the random variation and non-linear dynamic variation characteristics of vibration signals, a new method of rolling bearing fault diagnosis based on generalized multiscale mean permutation entropy (GMMPE) and grey wolf optimized least squares support vector machine (GWO-LSSVM) is put forward in this paper. Based on the multiscale permutation entropy (MPE), the multiscale equalization is firstly used to replace the coarse grained process, and the value of mean is extended to variance to avoid the dynamic mutation of the original signal. Finally, the parameters of LSSVM are optimized by the grey wolf optimization algorithm to achieve accurate identification of fault modes. The results of simulation and experiment show that applying the proposed GMMPE to rolling bearing fault feature extraction is feasible and superior, and the method based on GMMPE and GWO-LSSVM has better noise robustness, which can effectively achieve rolling bearing fault diagnosis.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 6","pages":"243-256"},"PeriodicalIF":1.4,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12149","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50124803","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: 1

Influence of non-ideal line-reflect-match calibration standards on vector network analyzer S-parameter measurements 非理想线反射匹配校准标准对矢量网络分析仪S参数测量的影响

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-06-02 DOI: 10.1049/smt2.12150

Wei Zhao, Chunyue Cheng, Chao Yang, Jiankang Xiao, Yibang Wang, Ye Huo

{"title":"Influence of non-ideal line-reflect-match calibration standards on vector network analyzer S-parameter measurements","authors":"Wei Zhao, Chunyue Cheng, Chao Yang, Jiankang Xiao, Yibang Wang, Ye Huo","doi":"10.1049/smt2.12150","DOIUrl":"https://doi.org/10.1049/smt2.12150","url":null,"abstract":"In this paper, an improved two-step method is presented for the sensitivity analysis of vector network analyzer (VNA) S-parameter measurements due to the non-ideal line-reflect-match (LRM) calibration standards. This improved method is based on the indirect uncertainty propagation mechanism, which is especially suitable for the S-parameter measurements applying the self-calibration technique. To further simplify the formula derivation, the deviation matrices [δA] and [δB] are newly defined to represent the uncertainties of the T-matrices of error boxes. With this definition, formulas for the deviations of device under test (DUT) S-parameters can be concluded as functions of [δA] and [δB] in a concise form. Eventually, by solving only three linear combinations of the elements from [δA] and [δB], the sensitivity coefficients of DUT S-parameters due to non-ideal LRM can be conveniently deduced in an analytical form. Finally, experiments are performed to verify the proposed method.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 6","pages":"257-268"},"PeriodicalIF":1.4,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12150","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50118305","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

Research on assessment method for main insulation state of converter transformer based on time-frequency domain dielectric response 基于时频域介质响应的换流变压器主绝缘状态评估方法研究

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-04-06 DOI: 10.1049/smt2.12145

Yizhou Zhang, Hao Yun, Mingze Zhang, Shengjie Lei, Yufei Sun

{"title":"Research on assessment method for main insulation state of converter transformer based on time-frequency domain dielectric response","authors":"Yizhou Zhang, Hao Yun, Mingze Zhang, Shengjie Lei, Yufei Sun","doi":"10.1049/smt2.12145","DOIUrl":"https://doi.org/10.1049/smt2.12145","url":null,"abstract":"The converter transformer is an essential part of the DC transmission system. Compared with the traditional oil-impregnated AC transformer, the main insulation of the converter transformer bears more complex electric field aging stress during long-term operation. The influence of the proportion of AC components in the AC/DC composite electric field on insulation aging is still unclear. Therefore, a combined aging test platform of composite electric field and thermal was built in the laboratory, and accelerated aging tests of oil-paper insulation under different AC/DC ratios were carried out. Through the time-frequency domain dielectric response characteristics of oil-paper insulation, the quantitative relationship between the time-frequency domain dielectric response characteristic parameters and AC proportional coefficient in different aging stages was obtained. The results show that the influence of the AC component on the aging of the oil-impregnated pressboard is more prominent. The maximum relaxation polarization time and the maximum exponential coefficient of polarization–depolarization current (PDC) can effectively characterize the aging of oil-paper insulation. Meanwhile, to accurately assess the insulation state of the converter transformer, this paper established the equivalent dielectric relaxation model for the main insulation structure. A quantitative assessment method for moisture content and aging of oil-paper insulation based on time-frequency domain dielectric response was proposed. The influence of transformer oil conductivity, test temperature, and main insulation structure was eliminated. The effectiveness of this method was verified by comparative tests, the maximum error for DP is 20, and the maximum error for moisture content is 0.15%. The research results of this paper can provide theoretical support for on-site assessment of converter transformer insulation status.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 5","pages":"208-219"},"PeriodicalIF":1.4,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12145","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50121963","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

Partial discharge signal compression reconstruction method based on transfer sparse representation and dual residual ratio threshold 基于转移稀疏表示和双残差比阈值的局部放电信号压缩重建方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-03-28 DOI: 10.1049/smt2.12148

Shice Zhao, Hongshan Zhao, Ma Libo, Qu Yuehan, Ren Hui

{"title":"Partial discharge signal compression reconstruction method based on transfer sparse representation and dual residual ratio threshold","authors":"Shice Zhao, Hongshan Zhao, Ma Libo, Qu Yuehan, Ren Hui","doi":"10.1049/smt2.12148","DOIUrl":"https://doi.org/10.1049/smt2.12148","url":null,"abstract":"Partial discharge (PD) signals have a large amount of data and a low energy proportion of pulse signals, resulting in difficult data transmission and poor reconstruction efficiency. To this end, a PD signal compression reconstruction method based on transfer sparse representation and dual residual ratio threshold (TSR-DRRT) is proposed. TSR-DRRT is centred on the sparse representation (SR) and accurate reconstruction of noisy signals. The intrinsic pulse of PD signals is extracted by signal decomposition, and jointly trained with different types of signals to establish the transfer SR dictionary. The compressed signal accurately retains the essential characteristics of the pulse information by improving the match between the dictionary atoms and the polymorphic PD pulses. To match the transfer SR dictionary, the inner and outer DRRT iteration termination conditions are set adaptively during the reconstruction process based on the correlation difference between the dictionary and signal frames. Independent control of PD pulse recognition and reconstruction accuracy is achieved, and its performance under noisy signals is improved. The results show that the method can achieve high ratio compression and efficient reconstruction of noisy signals. Different types of PD signals can also have high matching accuracy. This method can meet the demand for PD signals compression and transmission to the terminal for accurate reconstruction.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 6","pages":"230-242"},"PeriodicalIF":1.4,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12148","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50155311","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

Study on characteristics gases of metal protrusions partial discharge in 10-kV air-insulated switchgear 10kV空气绝缘开关设备金属突起局部放电特性气体的研究

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-03-23 DOI: 10.1049/smt2.12147

Qipeng Tan, Bin Song, Linong Wang, Shaocheng Wu

{"title":"Study on characteristics gases of metal protrusions partial discharge in 10-kV air-insulated switchgear","authors":"Qipeng Tan, Bin Song, Linong Wang, Shaocheng Wu","doi":"10.1049/smt2.12147","DOIUrl":"https://doi.org/10.1049/smt2.12147","url":null,"abstract":"Air-insulated switchgear plays an important role in distribution network and partial discharge (PD) is one of the common faults in its operation. The method of gas component analysis, which is to detect chemical gas products, is a novel one to discover PD. In order to study the feasibility of the method, the monitoring experiment of characteristic gases, comprising carbon monoxide (CO), nitrogen dioxide (NO2), and ozone (O3), of metal protrusion PD is carried out. This paper conducts the comparative experiments on three main factors affecting PD: voltage, air humidity and degree of protrusion, as well as studies how they affect the formation of characteristic gases. According to the experimental result, higher applied voltage promotes the formation of characteristic gases in the same conditions. In addition, with the increase of humidity from 40% to 75%, the generation of gases is inhibited. Furthermore, when the needle–plate distance is 30 mm, the gas concentration has almost no change within 6 h, which is different from that of 10 mm. In conclusion, the difference in gases concentration reveals the influence of three main factors on the generation of characteristic gases and provides an analytical basis for PD detection by gas composition analysis.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 6","pages":"221-229"},"PeriodicalIF":1.4,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12147","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50141945","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

Corrigendum to ‘A hierarchical diagnosis method of cable aged segment based on transfer function’ “基于传递函数的电缆老化段分级诊断方法”勘误表

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-03-07 DOI: 10.1049/smt2.12146

引用次数: 0

A comparative case study between shallow and deep neural networks in induction motor's fault diagnosis 浅层和深层神经网络在感应电机故障诊断中的比较案例研究

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-02-20 DOI: 10.1049/smt2.12143

Azadeh Gholaminejad, Saeid Jorkesh, Javad Poshtan

{"title":"A comparative case study between shallow and deep neural networks in induction motor's fault diagnosis","authors":"Azadeh Gholaminejad, Saeid Jorkesh, Javad Poshtan","doi":"10.1049/smt2.12143","DOIUrl":"https://doi.org/10.1049/smt2.12143","url":null,"abstract":"Here, performance of auto-encoder deep neural networks in detection and isolation of induction motor states (healthy, bearing outer race fault, stator winding short circuit and broken rotor bar) in the presence of unbalanced power supply and electro-pump dry running disturbances is investigated. Easily available three-phase electrical current signals are denoised using independent component analysis, and then the frequency-domain signal is used to train a neural network. A comparison is made between shallow and deep neural networks and also between the conventional structure of deep methods and the encoder–decoder structure in terms of training and test accuracy and robustness. In fact, the depth is increased and the effectiveness is investigated. At the end, it is shown that an encoder–decoder structure leads to the best result in terms of accuracy and robustness. The algorithms are examined experimentally, and the results show that the auto-encoder deep neural network can detect the aforementioned faults with a high reliability in the presence of disturbances.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 5","pages":"195-207"},"PeriodicalIF":1.4,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12143","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50138688","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: 2

Response to corrigendum for ‘Adaptive dynamic surface control of a two-axis gimbal system’ 对“双轴万向节系统的自适应动态表面控制”更正的回应

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-02-13 DOI: 10.1049/smt2.12144

引用次数: 0

Corrigendum: ‘Adaptive dynamic surface control of a two-axis gimbal system’ 勘误表：“双轴万向节系统的自适应动态表面控制”

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-01-21 DOI: 10.1049/smt2.12142

Mohammad Fathi, Hossein Bolandi

引用次数: 4