2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献

{"title":"High-temperature polarization analysis of polyethylene and polyethylene-semicon bilayers","authors":"R. Walker, A. Meddeb, S. Perini, E. Furman, R. Rajagopalan, M. Lanagan, W. Woodward, T. Person, S. Sengupta","doi":"10.1109/CEIDP55452.2022.9985362","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985362","url":null,"abstract":"Crosslinked polyethylene (XLPE) is a key material for power cable insulation due to its superior electrical properties. It is co-extruded with a semiconducting “semicon” layer, which is significantly more conductive than XLPE due to the incorporation of carbon black. Understanding the electrical properties of the XLPE/semicon bilayer and the interface between them is critical due to their common use. Two techniques were used to study electrical properties of XLPE and XLPE/semicon bilayers. One was current-voltage measurements, which analyzed resistivity as a function of time. The other was high-voltage polarization, which analyzed polarizability and dielectric loss as a function of electrical field. Thin films of PE and semicon were made via melt pressing. Dicumyl peroxide was infused to the beads prior to melt pressing such that XLPE was formed. All samples were degassed to remove DCP byproducts. Semicon/polyethylene bilayers were made by pressing the two layers together. LDPE and LDPE/semicon were also studied. Bulk brass electrodes were used. Current-voltage measurements showed that adding the semicon layer increased conductivity by an order of magnitude. Polarization measurements revealed that significant enhancement in the dielectric loss occurred at electric fields of 15 kV/mm and above. Polyethylene by itself and semicon bilayer samples had distinct electrical properties, and thus a proper understanding of the performance of XLPE in power cables required analyzing both. Further work is suggested that focuses on correlating changes in measured conductivity to the nature of the material interface (e.g., via enhanced charge injection and/or introduction of charge carriers).","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129008612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical research on insulation thickness design of 66 kV AC submarine cables","authors":"Yuantao Zhao, Qianyu. Shan, Xuetong Zhao, Zerui Wang, C. Wang, Lijun Yang, R. Liao","doi":"10.1109/CEIDP55452.2022.9985341","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985341","url":null,"abstract":"With the accelerated green energy development, offshore wind power generation become more and more attractive. Currently, several types of research present that the application of array submarine cables operating at high-voltage 66 kV instead of medium-voltage 35 kV shows considerable advantages on offshore wind farm systems. Insulation thickness is one of the crucial factors for the safe and reliable operation of submarine cables. In engineering applications, a high safety margin is often maintained to ensure a low electrical field in the cable insulation. However, an excessively high insulation thickness design in submarine cables can block the heat dissipation of the conductor, lower the current-carrying capacity, and raise production costs. In this work, the theoretical design of insulation thickness for 66 kV AC submarine cable are studied based on AC and impulse breakdown test. The AC and impulse breakdown strength of XLPE insulation with various temperatures from 30°C to 90°C and thickness from 0.2 mm to 0.4 mm were carried out, respectively. The temperature coefficient under AC and impulse voltage are both obtained at around 1.10 and 1.23 by comparing the breakdown strength at 30°C and 90°C. Besides, it is found that the AC breakdown strength is increased with the temperature from 30°C to 90°C, and then decreased with the temperature further rising from 50°C to 90°C. The thickness coefficients are also obtained by fitting the AC and impulse breakdown strength of the specimens with a thickness of 0.2 mm, 0.3 mm, and 0.4 mm. Step-stress test is also carried out to calculate the life exponent and deterioration coefficient of XLPE insulation based on the inverse power model. The life exponent of the XLPE insulation is evaluated at 30°C and 90°C, which is 13.9 and 15.1, respectively. It is found that the internal maximum AC and impulse field strength that cable insulation can bear during operation are 60 kV/mm and 145 kV/mm, respectively. Finally, an appropriate insulation thickness of ~8.9 mm is recommended based on the obtained internal maximum field strength, which is considered to meet the demand for 66 kV AC submarine cable. This study could provide an experimental and theoretical reference for the thickness design of submarine cables and will be helpful for the future development of light AC submarine cables.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121420806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electric Field Distribution after Polarity Reversal in HVDC Cables: The Effect of Insulation Characteristics","authors":"B. Diban, G. Mazzanti, M. Marzinotto, A. Battaglia","doi":"10.1109/CEIDP55452.2022.9985275","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985275","url":null,"abstract":"This paper investigates the effect of the electrical and the thermal characteristics of the insulating material of HVDC cables on the transient development during and after fast and slow polarity reversal events. Three sets of values of temperature and field coefficients of electrical conductivity are investigated in this study. The results show a strong effect of insulating material on both the amplitude of the transient electric field and the duration of the transient. The higher a, b coefficients, the greater the amplitude, but the faster the transient. The lower a, b coefficients, the lower the amplitude, but the longer the transient. The moderate field and temperature dependencies are recommended.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124107350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Impact of Superimposing Negative HVDC on AC Electrical Tree Growth in LDPE","authors":"Fang Liu, Faisal Aldawsari, H. McDonald, S. Rowland, Hualong Zheng","doi":"10.1109/CEIDP55452.2022.9985296","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985296","url":null,"abstract":"This paper explores the impact of negative HVDC superimposition on AC electrical tree growth in LDPE by comparing treeing under -60 kV DC superimposed with 7 kV pk AC (denoted ‘N60 ± 7’) and in AC fields at 7 kV pk and 8.4 kV. Trees tended to be limited in propagation at all three applied voltages. Tree lengths and widths at 8.4 kV tended to be larger than those at 7 kV and at ‘N60 ± 7’, while those at 7 kV and ‘N60 ± 7’ share similar lengths and widths. Trees grown at ‘N60 ± 7’ have a slim bouquet structure featuring a dense opaque 2D silhouette, while trees grown at 7 kV and 8.4 kV are dense branch structures with individual channels still evident in 2D images. One exceptional tree at 7 kV pk appeared like a slim bouquet structure but longer and wider. Unlike at ‘N60 ± 7’ which saw fine tree channel development from the existing slim bouquet structure during DC ramp down regardless of AC components, no fine channels were observed during AC voltage ramp down.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123098703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing One-vs-All 1D-CNN Classifiers for Multi-Label Classification of Partial Discharge Waveforms in 3D-Printed Dielectric Samples with Different Void Sizes","authors":"Sara Mantach, A. Ashraf, Puneet Gill, Derek Oliver, B. Kordi","doi":"10.1109/CEIDP55452.2022.9985326","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985326","url":null,"abstract":"Effective insulation degradation diagnosis is essential for monitoring the reliability of any electrical system. One cause of degradation within insulation materials is the occurrence of partial discharge in voids. The severity of the degradation is related to the size of these voids inside the material. Hence, non-invasive classification of the void size could be important for cost-effective maintenance. However, multiple void sizes can exist concurrently within the insulation material which makes the problem a multi-label classification problem. In this paper, the performance of a collection of one-versus-all one-dimensional convolutional neural network (CNN) was investigated to classify different void sizes inside 3D-printed dielectric samples. Training of the CNN classification algorithm was done on single void-size samples and testing was done on single and multiple void-size samples. The CNN took a set of PD time-series waveforms as the input and investigation was carried out to assess the performance of such a system when multi-labeled signals were presented in the testing phase. In addition, the effect of the number of the classified classes on the performance of the proposed system was considered.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115558706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of DC Polarity on Electrical Treeing in LDPE","authors":"Fang Liu, S. Rowland, H. McDonald, Hualong Zheng","doi":"10.1109/CEIDP55452.2022.9985383","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985383","url":null,"abstract":"A comparison is made of electrical tree initiation and growth in LDPE under pure positive and negative DC stresses. Branch trees formed from needles in DC fields, and they comprised channels of ~2 $mu$m diameter. Positive DC trees exhibited long initial lengths followed by little growth, while negative DC trees had shorter initial lengths with further tree growth. At −45kV, tree initiation length and the length at which tree growth ceases yield an inverse linear fit. PD events were measured before tree initiation in negative DC fields in some cases, and a linear relation was found between initial tree length and the logarithm of the maximum PD magnitude prior to initiation. An electric field threshold for tree growth is proposed. Based on this and an understanding of space charge injection and accumulation, the difference in tree initiation and growth with polarity is explained.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"85 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131808209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dry Arc Resistance of Aged Polymer-Fiberglass Laminates","authors":"A. Wilder, N. Frost","doi":"10.1109/CEIDP55452.2022.9985308","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985308","url":null,"abstract":"Arc resistance is a fundamental consideration with the use of polymer matrix composites as electrical insulation, particularly for applications with high voltage switching. However, engineering the arc resistance of composites remains a complex endeavor. Dry arc resistance in air of commercial fiberglass laminates FR5, G7, and GPO3 is compared. Aging, as one factor affecting dry arc resistance, is examined in this study. Ambient conditions at the material surfaces are maintained constant with minimal contamination. The ASTM test method D495 is generally followed, which is the application of timed current steps between two surface electrodes to determine the time to arc. Materials were characterized for polarization current normal to the surface prior to arc resistance testing. As compared to as received samples, a change in arc resistance with aging was not significant. However, clear difference in arc resistances between the laminate materials was determined, even without chemical contamination.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131179794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electric Field Computation and Insulation Structure Optimization for DC ±500kV Composite Tower","authors":"Xi Yang, Lijuan Zhu, Shenglong Zhu, Shaorui Qin, Xuhai Zhan","doi":"10.1109/CEIDP55452.2022.9985338","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985338","url":null,"abstract":"The new composite tower has the advantages of light weight, corrosion resistance and good electrical insulation, and its application range in transmission lines is gradually increasing. In this paper, aiming at the optimization of insulation structure in the design of DC ± 500kV composite towers, the secondary developed three-dimensional finite element analysis software is used to simulate and calculate the potential and electric field distribution of DC ± 500kV composite towers, control the surface field strength of the key positions of the composite towers, and propose a voltage grading ring configuration scheme of DC ± 500kV composite towers that meets the requirements of field strength control, which is helpful to improve the equipment level of domestic transmission lines, It is of great significance to expand the application range of new composite materials and ensure the safe and stable operation of transmission lines.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"31 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114101377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Partial Discharge Characteristics of Internal Void Defects under Special-shaped Wave Voltage","authors":"Min Tian, W. Shen, Wen Cao, Changjiang Chen, Ted F. Yang, Yan Du","doi":"10.1109/CEIDP55452.2022.9985265","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985265","url":null,"abstract":"During the production, manufacture and transportation of cross-linked polyethylene (XLPE) cable, internal void defects may generate inside the insulation, which will cause partial discharge (PD) affecting the safe and stable operation of XLPE cable. Special-shaped wave voltage has some superiorities in PD detection. The PD characteristics of XLPE insulation samples with internal void defects are investigated under the special-shaped wave voltage in this paper. Firstly, XLPE insulation samples with internal void defects were prepared. Secondly, special-shaped wave voltage was designed and output stably. Thirdly, PD test platform was built, and the tests were performed under both power frequency AC voltage and the special-shaped wave voltage. Finally, the PD characteristics of internal void defects under the above two types of voltages were analyzed. From the comparative analysis of the characteristic parameters of PD under the two voltages, it can be seen that the special-shaped wave voltage has more advantages in PD detection. At the same time, experiments shyow that the special distribution law of the discharge characteristic parameter under the decreasing special-shaped wave voltage is closely related to the accumulation of free electrons and the formation of electron collapses.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116781545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrical Properties of Epoxy Resin after Thermal Aging under High Humidity","authors":"Yan Yang, Jielin Ma, Malvern Yap, Qi Wang, W. K. Chern, Y. Foo, Zhongyang Chen","doi":"10.1109/CEIDP55452.2022.9985334","DOIUrl":"https://doi.org/10.1109/CEIDP55452.2022.9985334","url":null,"abstract":"The electrical properties of epoxy resin after hygrothermal aging were studied. The volume resistivity, dielectric loss, permittivity, and breakdown strength were measured for samples aged at 95 °C at a relative humidity of 95 % for 180 h, 420 h, 660 h, and 1000 h. It was found that the volume resistivity decreases with aging time by an order of magnitude at 1000 h. The dielectric loss and permittivity significantly increase with aging time in the low-frequency range. However, the AC breakdown strength is not significantly changed after the hygrothermal aging. A comparison was made with another group of samples aged at 95 °C without moisture control. Through the FTIR (Fourier Transform Infrared Spectroscopy) analysis of the molecular structure variation, the change of electrical properties is attributed to the water absorption, decomposition and hydrolysis of epoxy resin during the hygrothermal aging process.","PeriodicalId":374945,"journal":{"name":"2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115127848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}