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

A free-cutting mesh strategy for optimal shape synthesis in magnetics 磁学中最优形状合成的自由切削网格策略

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-06-10 DOI: 10.1049/smt2.12108

F. Dassi, P. Di Barba, A. Russo

引用次数: 0

High-time-resolution imaging of transient discharge processes without fixed triggering 无固定触发的瞬态放电过程的高时间分辨率成像

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-06-10 DOI: 10.1049/smt2.12111

Xianglin Meng, Hui Song, Gehao Sheng, Xiuchen Jiang

{"title":"High-time-resolution imaging of transient discharge processes without fixed triggering","authors":"Xianglin Meng, Hui Song, Gehao Sheng, Xiuchen Jiang","doi":"10.1049/smt2.12111","DOIUrl":"https://doi.org/10.1049/smt2.12111","url":null,"abstract":"Higher time resolution imaging is vital for exploring the microscopic mechanisms of the discharge process. The transient processes of discharge phenomena occur in a short time, and the onset cannot be predicted in advance, thus not providing a trigger mechanism for conventional high-speed imaging methods. Here, the authors propose a high-time-resolution imaging method with 55-ps time resolution and single-photon detection sensitivity. First, the current signal generated by the discharge itself with a rising edge of only a few tens of nanoseconds combined with a high-speed sensing and signal-processing device is used to solve the high-speed triggering problem, and then the single-photon avalanche detector array operating in time-correlated single-photon counting mode combined with computational imaging techniques is used to obtain the evolution of the negative corona discharge at atmospheric pressure in air on the ps time scale, and finally, the time-dependent curves of the discharge photon number at different experimental voltages with different curvature radii are analysed. The method opens up new possibilities for imaging other high-speed dynamic processes without a fixed trigger signal.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12111","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91822641","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 data-driven Dir-MUSIC method based on the MLP model 基于MLP模型的数据驱动Dir-MUSIC方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-05-25 DOI: 10.1049/smt2.12110

Wencong Xu, Yue Hu, Jianxun Li

{"title":"A data-driven Dir-MUSIC method based on the MLP model","authors":"Wencong Xu, Yue Hu, Jianxun Li","doi":"10.1049/smt2.12110","DOIUrl":"https://doi.org/10.1049/smt2.12110","url":null,"abstract":"The directional multiple signal classification (Dir-MUSIC) algorithm based on antenna gain array manifold has been proposed to find the direction of the partial discharge source successfully in substations, however, a non-linear optimisation problem in this algorithm is usually time-consuming. To achieve real-time feature, a data-driven Dir-MUSIC method based on the multilayer perception model is proposed to speed up the computing process and simultaneously guarantee the accuracy. Pre-trained the multilayer perception model, the non-linear optimisation problem can be treated as a function can be calculated directly. Input of the model is the noise matrix which can be uniquely calculated with a certain matrix measurement, and output is the estimated direction of the partial discharge source. Simulation results demonstrate that the proposed method has an excellent efficiency and relatively high accuracy, and the computing time can match the real-time demand. Additionally, two effective improvements are proposed to raise the direction accuracy and stability. Specifically, mean error is reduced from 2.58° to 2.22° with the first improvement, and from 2.58° to 1.00° with the second improvement.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12110","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91874205","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

Method for optimising the performance of PML in anchor-loss limited model via COMSOL 基于COMSOL的锚损有限模型PML性能优化方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-05-23 DOI: 10.1049/smt2.12107

Peng Li, Jun-Yu Ou, Jize Yan

{"title":"Method for optimising the performance of PML in anchor-loss limited model via COMSOL","authors":"Peng Li, Jun-Yu Ou, Jize Yan","doi":"10.1049/smt2.12107","DOIUrl":"https://doi.org/10.1049/smt2.12107","url":null,"abstract":"Perfectly matched layer has been used for solving anchor-loss limited quality factor in the Micro electromechanical systems. However, setting up a well-behaved perfectly matched layer requires users to change the parameters of a perfectly matched layer to give correct results, while the current existing methods for choosing the right parameters are vague and lack theoretical support. Based on the mathematical theory of perfectly matched layer and simulation results of a beam structure's quality factor, this paper proposes a method for choosing the parameter to optimise the performance of perfectly matched layer in COMSOL. The accuracy of the proposed method is proved by matching the effect of substrate height on beam's quality factor with theory prediction. The author also studies the effect of beam height and beam width on the quality factor of the beam. The results demonstrate that simulated quality factors are in agreement with analytical values when the ratio of height over length is small but will show great divergence when height equals the length. This trend can be observed for the beam width as well. Especially for larger ratio of beam width over beam length, instead of decreasing monotonously as analytical equitation would expect, the simulated quality factor will converge into a stable value of 1700, which matches the result of two-dimensional model for the same beam structure. This means that a three-dimensional model has to be used for estimating the quality factor of a beam structure.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91565715","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: 4

Designing and manufacturing of electric arc furnace currents measurement system in Mobarakeh Steel Company by printed circuit board-type Rogowski coils Mobarakeh钢铁公司采用印刷线路板式Rogowski线圈的电弧炉电流测量系统的设计与制造

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-05-18 DOI: 10.1049/smt2.12109

Reza Sadeghi, Haidar Samet, Teymoor Ghanbari, Darioush Daryabar

{"title":"Designing and manufacturing of electric arc furnace currents measurement system in Mobarakeh Steel Company by printed circuit board-type Rogowski coils","authors":"Reza Sadeghi, Haidar Samet, Teymoor Ghanbari, Darioush Daryabar","doi":"10.1049/smt2.12109","DOIUrl":"https://doi.org/10.1049/smt2.12109","url":null,"abstract":"This paper deals with the utilization of printed circuit board Rogowski coils (PCBRCs) for differential protection of electric arc furnace (EAF) transformers in Mobarakeh Steel Company (MSC), Isfahan, Iran. Because of a high level of current (in the range of 100 kA) in the EAF transformers in the MSC, employment of differential protection is quite challenging. Conventional current transformers (CTs) cannot offer reliable performance for very high current levels. The PCBRCs are a branch of Rogowski coils (RCs) that can be manufactured with high precision using computer-aided design approaches and have the capability for the measurement of very large currents. In this study, we have designed and manufactured two sets of PCBRCs to measure current in the primary and secondary sides of the EAF's transformers in the MSC. The PCBRCs are followed by a signal condition circuit (SCC) which includes a low-pass filter, amplifier, and voltage-to-current (V-to-I) converter block. Thanks to the SCC, the high current of the transformers can be properly sensed and transmitted over a long cable that connects the PCBRCs to the relay. Furthermore, a novel model is suggested for the EAF that includes characteristics of both time and frequency domain models. The suggested model is developed using a large number of recorded data from the MSC and can model the non-linear and time-variant behaviours of the EAF. The proposed PCBRCs, SCC, and EAF modelling are evaluated by some simulations and experiments in the MSC.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12109","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91849249","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

Interface quasi-distributed fibre Bragg grating positioning detection of glaze icing load on composite insulators 复合绝缘子上釉覆冰载荷的界面准分布式光纤光栅定位检测

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-05-13 DOI: 10.1049/smt2.12106

Yanpeng Hao, Lei Huang, Jie Wei, Ruijian Pan, Weixun Zhang, Lin Yang

{"title":"Interface quasi-distributed fibre Bragg grating positioning detection of glaze icing load on composite insulators","authors":"Yanpeng Hao, Lei Huang, Jie Wei, Ruijian Pan, Weixun Zhang, Lin Yang","doi":"10.1049/smt2.12106","DOIUrl":"10.1049/smt2.12106","url":null,"abstract":"The electrical performance of transmission line insulators will decrease dramatically under ice-covered conditions, and ice flashover may occur under operating voltage. There is no direct and effective monitoring method for ice cover on insulators of transmission lines. In this paper, the interface quasi-distributed fibre Bragg grating (FBG) is used to study the positioning detection of glaze icing loads on composite insulators, and a mechanical lever model of single glaze icing load on single umbrella detection with three FBGs is established. Based on this model, a multi-glaze location detection method on multiple umbrella skirts is proposed. Six optical fibres with 13 quasi-distributed FBGs each are implanted into the interface of a 110 kV composite insulator. The minimum load test of FBG for detecting glaze icing load, the FBG axial/circumferential sensing rule test for the glaze, and the weight simulation test and laboratory icing verification test for multi-glazes on multi-umbrellas location detection method are carried out. The results show that the positioning of glaze simulated by weights is accurate, and the positioning of icing in the laboratory is basically correct.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12106","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131514950","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: 3

Influence of surface discharge on the deterioration characteristics of ethylene-propylene rubber cable insulation under alternating current high voltage 交流高压下表面放电对乙丙橡胶电缆绝缘劣化特性的影响

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-04-28 DOI: 10.1049/smt2.12104

Longlei Bai, Daoping Fan, Tianhe Li, Bing Li, Mingwei Su, Shaogui Fan, Liuzhong Zhang

{"title":"Influence of surface discharge on the deterioration characteristics of ethylene-propylene rubber cable insulation under alternating current high voltage","authors":"Longlei Bai, Daoping Fan, Tianhe Li, Bing Li, Mingwei Su, Shaogui Fan, Liuzhong Zhang","doi":"10.1049/smt2.12104","DOIUrl":"10.1049/smt2.12104","url":null,"abstract":"To investigate partial discharge-induced deterioration characteristics of ethylene-propylene rubber (EPR) cable insulation under repeated alternating current (AC) voltage on high-speed trains, an experimental platform with a column-plate EPR insulation model is established. The surface condition and breakdown voltage of insulation samples after discharge treatment are observed and measured. In addition, a fitting formula to evaluate the deterioration extent of EPR samples is proposed. The results show that under repeated discharge pretreatments, the volume resistivity increases first and decreases afterwards when discharge magnitude is low. When partial discharge (PD) intensity increases to 100 pC, the volume and surface resistivity decrease monotonously, and the decreasing rate is positively correlated with PD intensity. During PD pre-treatment, a white circle appears near the electrode and turns to pale yellow with PD intensity. For PD pretreatments of 50 and 100 pC, withstand voltage of EPR insulation increase first and decrease afterwards, and the downward trend is slow. For PD pre-treatments of 200 and 400 pC, the withstand voltage decreases significantly with the degradation time. The fitting formula model shows that under the action of a strong electric field, the relationship between the reliability of EPR insulation samples, the probability and rate of molecular chain breakage, and the intensity of discharge activity is not linear.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121761636","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: 5

Parameters design of voltage sharing components for the series multi-break mechanical switch 系列多断机械开关电压分担元件参数设计

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-04-26 DOI: 10.1049/smt2.12105

Daochun Huang, Huaqing Wang, Wanlin Quan, Xin Chen, Mingjing Shuang, Huipeng Li

{"title":"Parameters design of voltage sharing components for the series multi-break mechanical switch","authors":"Daochun Huang, Huaqing Wang, Wanlin Quan, Xin Chen, Mingjing Shuang, Huipeng Li","doi":"10.1049/smt2.12105","DOIUrl":"https://doi.org/10.1049/smt2.12105","url":null,"abstract":"Series multi-break mechanical switch is one of the critical components of high-voltage hybrid DC circuit breakers. However, due to the existence of distributed capacitance, the voltage distribution between the breaks is not balanced. This paper proposed a voltage sharing configuration method of the mechanical switch of hybrid DC circuit breaker, and carried out the static DC voltage and the transient voltage distribution characteristics tests to verify its effectiveness. Considering the influence of whole structure of the circuit breaker, this paper established the electrostatic field model and circuit simulation model of a typical ±535-kV hybrid DC circuit breaker. And it analyzed the influence of single break's opening fault, breaking open distance, and the shielding fitting on the voltage distribution characteristics of series six break mechanical switch. According to the simulation results based on the Zhangbei voltage source converter-based high-voltage direct current project type test parameters, the parameters design of the voltage sharing components of the mechanical switch are obtained, which can meet the voltage sharing coefficient requirement of 95%.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137548615","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

Characteristics of electrical tree morphological in glass fibre reinforced epoxy resin under power frequency voltage 工频电压下玻璃纤维增强环氧树脂的电树形态特征

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-03-23 DOI: 10.1049/smt2.12102

Yongqiang Wang, Ziye Huang, Xiaolei Zhang, Jing Shang

{"title":"Characteristics of electrical tree morphological in glass fibre reinforced epoxy resin under power frequency voltage","authors":"Yongqiang Wang, Ziye Huang, Xiaolei Zhang, Jing Shang","doi":"10.1049/smt2.12102","DOIUrl":"https://doi.org/10.1049/smt2.12102","url":null,"abstract":"To study the influence of the arrangement of glass fibres on the growth morphology of electric dendrites, this paper conducted experiments on the initiation and cultivation of electric dendrites on insulation specimens with different glass fibre arrangements. The experimental results show that when the electric field is parallel to the glass fibres, the electric dendrites show linear growth with multiple branches; when the electric field is perpendicular to the glass fibres, the electric dendrites show aggregated growth. The analysis suggests that when the applied electric field is parallel to the glass fibre, to release the discharge energy in the main channel of the dendrite, the discharge in the track of the electric dendrite will drive the electric dendrite to grow along the interface area between the glass fibre and the epoxy resin. When the externally applied electric field is perpendicular to the glass fibre, the discharge within the electric dendrite discharge channel is high. To release the energy in the electrical tree channel, the blast in the electrical tree track induces the electrical tree branch to grow along the interface area and forward.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137977859","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

Soil impulse ionisation model based on dynamic changes of electric field 基于电场动态变化的土壤脉冲电离模型

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-03-13 DOI: 10.1049/smt2.12103

Xishan Wen, Chun Li, Jiahao Chen, Xuefang Tong, Hao Mei, Guangyuan Zhou, Bichuan Xu, Hailiang Lu

引用次数: 2