Iet Science Measurement & Technology最新文献_第8页

Investigation on combined effect of humidity–temperature on partial discharge through dielectric performance evaluation 通过介电性能评估研究湿度-温度对局部放电的综合影响

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-09-30 DOI: 10.1049/smt2.12128

Yatai Ji, Paolo Giangrande, Weiduo Zhao, Vincenzo Madonna, He Zhang, Jing Li, Michael Galea

{"title":"Investigation on combined effect of humidity–temperature on partial discharge through dielectric performance evaluation","authors":"Yatai Ji, Paolo Giangrande, Weiduo Zhao, Vincenzo Madonna, He Zhang, Jing Li, Michael Galea","doi":"10.1049/smt2.12128","DOIUrl":"https://doi.org/10.1049/smt2.12128","url":null,"abstract":"The humidity role in the partial discharge (PD) inception mechanism is quite challenging, especially when considering the environmental temperature. Indeed, there is no general rule to explain the humidity effect on the PD phenomenon. In this paper, the PD activity in inter-turn insulation is experimentally investigated for different relative humidity (RH) conditions at three different ambient temperatures, that is, 30°C, 60°C, and 90°C. Partial discharge inception voltage (PDIV) is directly measured through a photomultiplier tube (PMT), whereas the tip-up tests are performed aiming at monitoring both dissipation factor (tanδ) and insulation capacitance (IC). These extra measurements (diagnostic dielectric markers) allow better assessing the insulation status. The adoption of the tip-up test enables the insulation properties measurement. Based on the tip-up tests’ findings, the interfacial polarization process starts at 75% RH under 60°C, while the high conductivity area is already formed at 75% RH when the ambient temperature is 90°C. The water film formation deduced from the tip-up test is then used to explain the trend of PDIV, and the validity is further proved by finite element analysis (FEA).","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50148584","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

A novel approach to touch voltage risk assessment for gas pipelines in shared transmission corridors 一种新的输电走廊内输气管道接触电压风险评估方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-09-26 DOI: 10.1049/smt2.12127

Keith Man-Kei Chan, Craig Antony Baguley, Udaya K. Madawala

{"title":"A novel approach to touch voltage risk assessment for gas pipelines in shared transmission corridors","authors":"Keith Man-Kei Chan, Craig Antony Baguley, Udaya K. Madawala","doi":"10.1049/smt2.12127","DOIUrl":"https://doi.org/10.1049/smt2.12127","url":null,"abstract":"Touch voltages are more likely to appear on long-distance pipelines that lie in shared corridors with transmission lines. The touch voltage level varies with soil resistivity and can become hazardous while maintenance is being undertaken, necessitating risk assessment. Therefore, a novel approach is proposed that achieves better accuracy in the risk assessment of hazardous touch voltages appearing on pipelines than current approaches. The proposed approach incorporates soil resistivity measurements taken over a 1-year period, allowing for the derivation of soil models, touch voltage hazard profiles versus time and, thus, a probability reduction factor that can be integrated into a probabilistic risk calculation. Using a probability reduction factor is a key aspect to improving the accuracy of risk assessment, allowing pipeline asset operators to clearly identify whether or not, risk mitigation action is required. Further, the proposed approach allows appropriate risk mitigation actions to be identified. The efficacy and significance of the proposed approach are demonstrated through a case study on an area of land near a shared gas pipeline and transmission line corridor. The case study results show how appropriate safety levels can be achieved by adjusting the number of work day per year and temporary protection settings.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12127","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50121897","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

Optimization scheme of partial discharge location of external insulation based on 2-D multiple signal classification algorithm 基于二维多信号分类算法的外绝缘局部放电位置优化方案

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-09-18 DOI: 10.1049/smt2.12124

Shaotong Pei, Dewang Liu, Zijian Ye, Jiajun Yang, Yunpeng Liu

{"title":"Optimization scheme of partial discharge location of external insulation based on 2-D multiple signal classification algorithm","authors":"Shaotong Pei, Dewang Liu, Zijian Ye, Jiajun Yang, Yunpeng Liu","doi":"10.1049/smt2.12124","DOIUrl":"https://doi.org/10.1049/smt2.12124","url":null,"abstract":"Partial discharge (PD) localization is critical to ensure the safe operation of power equipment. In this paper, an optimization scheme is developed for PD positioning of external insulation equipment. The optimization scheme is based on an eight-element cross sensor array to receive the ultrasonic signal generated by the PD, and uses the highly accurate 2-D multiple signal classification (2-D MUSIC) algorithm to locate the signal. Simulated discharge signal is adopted to test the optimization scheme, and the results show that the positioning error is less than 0.61° when the signal-to-noise ratio (SNR) is above −5 dB. In addition, three discharge models are tested at various locations. The average azimuth errors are 0.9°, 1.9°, and 1.55° for the needle-plate, cone-plate, and ball-plate discharge models, respectively, and the average pitch angle errors are 0.75°, 2.1°, and 1.4°, respectively. These show that the needle-plate model has the best positioning effect. Simulations and experiments are also carried out on the double discharge source scenario, and the error is within 2.2°. A PD location visualization equipment based on the proposed optimization scheme is developed and applied on-site. The equipment is capable of satisfying the requirements of operation and maintenance.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12124","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50137525","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

Manipulation of stator current signature for rotor asymmetries fault diagnosis of wound rotor induction machine 利用定子电流特征对绕线转子感应电机转子不对称故障进行诊断

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-09-16 DOI: 10.1049/smt2.12126

Mohammad Hoseintabar Marzebali, Vahid Abolghasemi, Saideh Ferdowsi, Reza Bazghandi

引用次数: 3

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层诊断方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-09-15 DOI: 10.1049/smt2.12125

Zhao Hong-shan, Guo Xiao-mei, Ma Li-bo, Wang Yan, Sun Cheng-yan, Chang Jie-ying

{"title":"A hierarchical diagnosis method of cable aged segment based on transfer function","authors":"Zhao Hong-shan, Guo Xiao-mei, Ma Li-bo, Wang Yan, Sun Cheng-yan, Chang Jie-ying","doi":"10.1049/smt2.12125","DOIUrl":"https://doi.org/10.1049/smt2.12125","url":null,"abstract":"Traditional offline cable diagnosis methods need power outages during detection, affecting power supply reliability. Here, a hierarchical diagnosis method of cable aged segment based on transfer function is proposed. Firstly, the calculation model of cable transfer function with the aged segment is established; on this basis, the correlation between transfer function and cable aging is analysed. Then, a structure with combined sparse autoencoder and convolutional neural network is trained to estimate the aging location, and a hierarchical diagnosis model of distribution cable based on transfer function is proposed. The sensitivity and accuracy of aged segment detection are improved after hierarchical diagnosis. Finally, the simulation results show that the method proposed in this paper can effectively realize the online identification and location of the cable aged segment. The proposed method makes use of the advantage that the cable transfer function can be obtained online. Compared with the existing methods, this method does not need power outages in the diagnosis process, and the aged segment can be located without a lot of additional equipment.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12125","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92296451","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

Analysis of yellowing phenomenon caused by electrical and thermal degradation in the interface of cross-linked polyethylene cable joints 交联聚乙烯电缆接头界面电、热降解致黄变现象分析

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-09-09 DOI: 10.1049/smt2.12122

Sungho Yoon, Hyeongwook Son, Hyeongsang Ko, Jeongtae Kim

{"title":"Analysis of yellowing phenomenon caused by electrical and thermal degradation in the interface of cross-linked polyethylene cable joints","authors":"Sungho Yoon, Hyeongwook Son, Hyeongsang Ko, Jeongtae Kim","doi":"10.1049/smt2.12122","DOIUrl":"https://doi.org/10.1049/smt2.12122","url":null,"abstract":"Yellowing phenomena have been frequently observed at the interface between the cross-linked polyethylene (XLPE) insulation and the semiconducting rubber in the joint when a failure occurs at the end bushing in gas (EBG) of the XLPE transmission cable joint. It is known that lubricants deteriorate thermally and electrically, which is related to connection material failure. In this study, in order to analyse the cause of the yellowing phenomenon in the XLPE cable termination, modelled experiments including liquid silicone rubber (LSR) semiconducting rubber and ethylene propylene diene monomer (EPDM) semiconducting rubber were carried out with the long-term electrical and thermal deterioration, and the degree of deterioration was investigated through chemical analysis and visual inspection. As a result, it was found out that the yellowing phenomenon of the lubricant at the joint interface was caused by partial discharges deterioration and was accelerated by thermal deterioration. Also, it is shown that LSR absorbs lubricant, whereas EPDM does not absorb lubricant but extracts surfer compound, which directly affects yellowing and solidification of lubricant. In addition, it is revealed that the micro-bubbles produced in the lubricant may provide a fundamental cause of partial discharges, which results in the yellowing phenomena.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12122","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92371466","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

Simulation test study on fatigue characteristics of circuit breaker insulation pull rod 断路器绝缘拉杆疲劳特性模拟试验研究

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-08-12 DOI: 10.1049/smt2.12120

Liu Peng, Wu Qingsong, Wang Haoran, Cui Boyuan, Wu Zhehua, Chen Yun, Yang Yong, Peng Zongren

{"title":"Simulation test study on fatigue characteristics of circuit breaker insulation pull rod","authors":"Liu Peng, Wu Qingsong, Wang Haoran, Cui Boyuan, Wu Zhehua, Chen Yun, Yang Yong, Peng Zongren","doi":"10.1049/smt2.12120","DOIUrl":"https://doi.org/10.1049/smt2.12120","url":null,"abstract":"The insulation pull rod is the main transmission mechanism of the circuit breaker. In addition to strong electrical performance, it should also have strong mechanical properties. Studying the dynamic characteristics and response insulation pull rods during opening and closing operation and exploring the changes in mechanical characteristics of insulation pull rods during multiple openings and closings are of great significance. In this paper, a 252kV GIS circuit breaker simulator is used to carry out an opening and closing impact fatigue test on an insulation pull rod. The strain signals of the insulation pull rod during the opening and closing stages are obtained. The strain distribution of insulation pulls rod and the influence of operation times on strain are analyzed. The results show that the force on the pull rod is uneven during operation. The force on the mechanism side and contact side is small, and the force on the rod body is large. Also, the pull rod is unstable and bent under pressure force. The impact response frequency is mainly distributed between 0∼1500Hz. With the increase in operation times, the low-frequency component of frequency response basically remains unchanged, while the high-frequency component decreases. After 10000 times opening and closing operations, there was no obvious mechanical loss on the pull rod, but the mechanical properties decreased. The research results can provide reference and basis for the formulation of the performance test method, and specifications of insulating rod materials.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92292401","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 volume and surface conductivity on the transient surface charge characteristics of DC-GIL insulator under thermal–electric coupled fields 热电耦合场下体积和表面电导率对DC-GIL绝缘子瞬态表面电荷特性的影响

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-07-25 DOI: 10.1049/smt2.12121

Xiaolong Li, Songling Han, Wen Wang, Zhenxin Geng, Xin Lin

{"title":"Influence of volume and surface conductivity on the transient surface charge characteristics of DC-GIL insulator under thermal–electric coupled fields","authors":"Xiaolong Li, Songling Han, Wen Wang, Zhenxin Geng, Xin Lin","doi":"10.1049/smt2.12121","DOIUrl":"https://doi.org/10.1049/smt2.12121","url":null,"abstract":"Here, the transient surface charge distribution of a basin-type insulator is investigated under thermal–electric coupled fields. Horizontally installed ±200 kV direct current gas-insulated transmission lines (DC-GIL) are employed, and a 3D geometric model is applied. An improved method is introduced in the transient simulation under coupled fields, which involves simplifying geometric model, decoupling calculation, applying weak form partial differential equation, and simplifying ion transport equation. The influence of volume and surface electric conductivity on the transient surface charge and electric field distribution is discussed. With increasing volume conductivity, the transient charge accumulation is accelerated due to the promotion of conduction through the insulator. With increasing volume conductivity, the polarity of the charge on convex surface changes from negative to positive, while it changes from positive to negative with increasing surface conductivity. This is the consequence of the transition in dominant conduction mechanism. Non-monotonic variation of charge density is observed attributing to the variation transient field distribution. It can be concluded that the influence of volume and surface conductivity should be focused on when evaluating the insulation characteristics of DC-GIL insulators, and the thermal gradient should be considered in dealing with the long-term operating insulators.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12121","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137547078","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 mathematical method for local defects and faults identification of 10 kV three-core cable based on input impedance spectrum 基于输入阻抗谱的10kv三芯电缆局部缺陷与故障识别的数学方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-07-21 DOI: 10.1049/smt2.12119

Yan Wang, Jialin Zhang, Chongcheng Yao, Hongshan Zhao

{"title":"A mathematical method for local defects and faults identification of 10 kV three-core cable based on input impedance spectrum","authors":"Yan Wang, Jialin Zhang, Chongcheng Yao, Hongshan Zhao","doi":"10.1049/smt2.12119","DOIUrl":"10.1049/smt2.12119","url":null,"abstract":"Due to the strong coupling among the conductors of 10 kV three-core armored cables and the difficulty in identifying its defects and fault types, a method is proposed based on the input impedance spectrum. Firstly, the phase mode transformation matrix of a three-core cable is obtained by combining the multi-conductor transmission line theory with the loop analysis method to realize decoupling between conductors. Secondly, the input impedance matrices of a cable under different situations are derived. Based on this, a method is proposed to identify the local defects and fault types. The capacitive defects and inductive defects are identified according to the left or right offset of the amplitude spectrum; the short circuit and break faults of the cable can be identified according to the number of resonant points in the amplitude spectrum and the initial phase angle of the phase spectrum. Finally, to verify the correctness of the proposed method, a 10 kV three-core cable is taken as an example to carry out PSCAD circuit simulation and practical test. The results show that the proposed method can effectively identify the local defects and fault types of the three-core cable.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12119","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125912119","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

Vibration detection method for core loosening degree of high-voltage direct current converter valve saturable reactor based on variational mode decomposition-symmetrized dot pattern and image matching 基于变分模态分解-对称点图和图像匹配的高压直流换流阀饱和电抗器铁芯松动程度振动检测方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-07-18 DOI: 10.1049/smt2.12118

Yunpeng Liu, Tingyu Lai, Jiashuo Liu, Xiaoguang Wei, Shaotong Pei, Chenghao Wang, Xiaolong Zhang

{"title":"Vibration detection method for core loosening degree of high-voltage direct current converter valve saturable reactor based on variational mode decomposition-symmetrized dot pattern and image matching","authors":"Yunpeng Liu, Tingyu Lai, Jiashuo Liu, Xiaoguang Wei, Shaotong Pei, Chenghao Wang, Xiaolong Zhang","doi":"10.1049/smt2.12118","DOIUrl":"10.1049/smt2.12118","url":null,"abstract":"Saturable reactor is the key equipment in converter valves; it is important to evaluate the core condition. In this paper, a recognition model of saturable reactor core loosening based on variational mode decomposition (VMD)-symmetrized dot pattern (SDP) feature fusion images and scale-invariant feature transform (SIFT) was proposed. Firstly, the saturable reactor vibration test under high frequency pulse excitation was carried out, and the vibration signals in different core loosening degrees were collected. Secondly, the VMD algorithm was used to decompose the broadband vibration signal into multiple narrowband functions, which were used to reflect the characteristics of each frequency band. Thirdly, each function and the original signal were transformed by SDP, the generated spiral arms were fused into a new image, and the typical templates in different loosening degrees were selected. Finally, the improved SIFT algorithm was used to obtain the matching results between test sets and templates. The results show that the recognition accuracy of the proposed model for core loosening is 97.5%, which is better than traditional algorithms. It can find the core loosening defect early and avoid further failures such as water pipe break and discharge, which can provide an important basis for saturable reactor monitoring.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130786777","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