2020 IEEE 3rd International Conference on Dielectrics (ICD)最新文献_第7页

Characterization of Electrical Treeing in XLPE versus Temperature Gradients 交联聚乙烯的电树特性与温度梯度的关系

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341977

Xin Zhao, Siyi Zhang, Cheng-lu Lin, Zhi Yang, Zhonglei Li, T. Han

{"title":"Characterization of Electrical Treeing in XLPE versus Temperature Gradients","authors":"Xin Zhao, Siyi Zhang, Cheng-lu Lin, Zhi Yang, Zhonglei Li, T. Han","doi":"10.1109/ICD46958.2020.9341977","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341977","url":null,"abstract":"Cross-linked polyethylene (XLPE) plays a significant role in AC power cables. In the cables, the difference in temperatures of conductor and surrounding environment produces a temperature gradient in XLPE, and the electrical and thermal aging accelerate the degradation. When defects exist in the dielectric, an electrical tree may be initiated. Hence, it is necessary to research the electrical tree in XLPE under the temperature gradient. In this paper, XLPE samples were tested under 50 Hz AC voltage with multiple temperature gradients, and the electrical tree was recorded by a digital microscope. To simulate an electrical stress concentration, a pair of needle-plate electrodes was utilized in this experiment. There are two types of temperature gradients in this experiment, one is to set the needle electrode temperature to 100 °C and increase the ground electrode temperature from 30 to 70 °C, and the other is the opposite. The tree structure, growth process, fractal dimension, accumulated damage and tree length were recorded and analyzed. The experiment results indicate that the temperature gradient affects the growth rate and the structure of trees. When the ground electrode temperature is higher than the needle tip, the tree grows faster. The fractal dimension and the accumulated damage increase as the temperature gradient increases.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"23 1","pages":"25-28"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78032953","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}

引用次数: 1

From Laboratory to Industrial Scale: Comparison of Short- and Long-Term Dielectric Performance of Silica-Polypropylene Capacitor Films 从实验室到工业规模:硅-聚丙烯电容器薄膜的短期和长期介电性能比较

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341890

K. Lahti, I. Rytöluoto, Minna Niittymäki, Eetta Saarimäki, M. Paajanen

引用次数: 1

Volatile Acid and Polymer Formation in Various Insulation Liquids Upon Accelerated Thermal Ageing 加速热老化过程中各种绝缘液体中挥发性酸和聚合物的形成

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9342021

E. Matić, M. Meissner, S. Schober, M. Mittelbach

{"title":"Volatile Acid and Polymer Formation in Various Insulation Liquids Upon Accelerated Thermal Ageing","authors":"E. Matić, M. Meissner, S. Schober, M. Mittelbach","doi":"10.1109/ICD46958.2020.9342021","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9342021","url":null,"abstract":"Insulation liquids perform a vital role in protecting power equipment, such as transformers, from thermal, electrical and environmental stress. Considering the poor fire-safety properties and low biodegradability of mineral oil as the leading kind of insulation liquid, alternative insulation liquids are of high interest for their implementation in power equipment. In this experiment we aimed to simulate the processes occurring in faulty power equipment by ageing four different kinds of insulation liquids (mineral oil, GTL-insulation liquid, synthetic ester and natural ester) under laboratory conditions. The use of optimized analytical routine methods has allowed us to monitor as well as quantify volatile acid and polymer formations upon ageing of insulation liquids. The ageing process under aerated conditions has led to the formation of formic, acetic and propionic acid, especially in natural ester, alongside notable polymerization effects. All other types of insulation liquids showed significantly lower amounts of volatile acids. Per contra, the experiments conducted under oxygen-free conditions resulted in minimal volatile acid and polymer build-ups in all four insulation liquids.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"49 1","pages":"317-320"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80719830","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}

引用次数: 1

Separation of superimposed PRPD Patterns by Signal Clustering 基于信号聚类的PRPD叠加模式分离

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341858

B. Adam, S. Tenbohlen, M. Beltle

{"title":"Separation of superimposed PRPD Patterns by Signal Clustering","authors":"B. Adam, S. Tenbohlen, M. Beltle","doi":"10.1109/ICD46958.2020.9341858","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341858","url":null,"abstract":"Partial discharges are one of the main reasons of insulation failure in transformers. Multiple partial discharge sources in HV equipment can be active at the same time. Diagnosis is complicated by superimposed or overlapping patterns in the PRPD patterns. In order to classify the fault source correctly, the patterns must be separated first. In this paper we propose a method to separate partial discharge signals from different sources by their impulse waveform. A feature-set is constructed by selecting relevant features from a pool of 700 identified possible features. Then, different sources are separated by clustering techniques. Centroid-based clustering methods like the k-means algorithm are compared to density-based approaches like DBSCAN. After clustering multiple PRPD patterns can be calculated – one for each source. This method is developed on artificial partial discharge data, measured in the laboratory. Four different typical defect types are considered. Through multiple case studies we show, that the separation process works on different kinds of PD problems. This method works for all kinds of PD faults. It is shown, that PD sources not present in the training data used for development can also be separated reliably.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"96 1","pages":"858-861"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80359020","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}

引用次数: 0

Benefit of Nonlinear Resistive Field Grading Materials on Medium Voltage Bushing by Finite Element Modeling (Flux 2D) vs Experimental Partial Discharge Measurements 采用有限元模型(Flux 2D)对中压套管进行非线性电阻场分级材料与实验局部放电测量的优势

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341815

R. Metz, M. Hassanzadeh

引用次数: 0

Interfacial E-field Regulating Insulator for DC Gas-solid Insulating System 直流气固绝缘系统界面电场调节绝缘子

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341966

Hucheng Liang, B. Du, Jin Li, R. Zhao, Zehua Wang, Miaomiao Zhang, Ang Li, Q. Du

引用次数: 0

Modelling the electric field transients in DC insulation systems upon energization and voltage polarity inversion 直流绝缘系统在通电和电压极性反转时的电场瞬态建模

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341921

P. Seri, G. Montanari

{"title":"Modelling the electric field transients in DC insulation systems upon energization and voltage polarity inversion","authors":"P. Seri, G. Montanari","doi":"10.1109/ICD46958.2020.9341921","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341921","url":null,"abstract":"Designing insulation systems for DC application is not straightforward as under AC, both because electric field can distribute inside the insulation in significantly different ways, and due to the effect on field distribution of voltage transients, such as energizations and the polarity inversions. During and after each voltage variation, the electric field in the insulation is mainly driven by permittivity, as in AC, while at steady-state the electric field profile depends on conductivity and, hence, on dielectric material and load. This can impact on aging phenomena and rate, thus on the electro-thermal life of an insulation system. It is, therefore, important to estimate how long it takes for the electric field to reach its steady state condition (i.e. the transient time) upon voltage-time variations. Different methods for estimating the electric field transient time are discussed in this paper, from conductivity and permittivity measurements at high or low fields, as a function of temperature, to partial discharge time evolution. Specimens made by polymeric materials having different conductivities, and containing artificial defects, are used for the experimental validation of those methods.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"770 Pt A 1","pages":"485-488"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77050146","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}

引用次数: 0

Bilayer PI/BaTiO3-P(VDF-TrFE-CFE) composites with high discharge energy density 高放电能量密度双层PI/BaTiO3-P(VDF-TrFE-CFE)复合材料

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341867

B. Du, J. Xing, M. Xiao, Jin Li, R. Xu, Z. Ran, H. Liu, H.L. Sun

{"title":"Bilayer PI/BaTiO3-P(VDF-TrFE-CFE) composites with high discharge energy density","authors":"B. Du, J. Xing, M. Xiao, Jin Li, R. Xu, Z. Ran, H. Liu, H.L. Sun","doi":"10.1109/ICD46958.2020.9341867","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341867","url":null,"abstract":"Ferroelectric polymer P(VDF-TrFE-CFE) is widely employed as energy storage materials of dielectric capacitors, but the discharge energy density of P(VDF-TrFE-CFE) is limited by the lower breakdown strength, which restricts the further development. The paper proposes a solution by preparing P(VDF-TrFE-CFE) composites based on bilayer structure and nanoparticles. Polyimide (PI) with high breakdown strength is used as the bottom layer, and the BaTiO3/Ferroelectric polymer composites BT-P(VDF-TrFE-CFE) with high dielectric constant is used as the top layer, the bilayer composite films PI/BTP(VDF-TrFE-CFE) doped with different content of BaTiO3 (1 vol.%, 3 vol.%, 5 vol.%) were prepared via coating, heat treatment and quenching. The microstructure and energy storage performance of bilayer films were analyzed, the results show that the discharge energy density of composite film doping with 3 vol.% of BaTiO3 can be up to 9.8 J/cm3 at 440 kV/mm, which is higher than pure P(VDF-TrFE-CFE) film (7.2 J/cm3). The energy storage efficiency of composite film is 46% at 440 kV/mm, slightly lower than pure P(VDF-TrFE-CFE) film (49% at 337 kV/mm).","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"206 1","pages":"185-188"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77060536","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}

引用次数: 2

Investigating the Electronic Properties of a Composite Dielectric under an Applied Electric Field by Muon Spectroscopy 用介子光谱研究外加电场作用下复合介质的电子特性

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9342014

B.A. Orton, S. Cottrell, F. Pratt, S. Dodd, N. Chalashkanov

{"title":"Investigating the Electronic Properties of a Composite Dielectric under an Applied Electric Field by Muon Spectroscopy","authors":"B.A. Orton, S. Cottrell, F. Pratt, S. Dodd, N. Chalashkanov","doi":"10.1109/ICD46958.2020.9342014","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9342014","url":null,"abstract":"The development of a new technique using implanted 100% spin polarized positive muons to probe the behaviour of charge carriers within dielectrics is described. Muons are a well-established method for probing materials at the atomic level. They offer a local probe sensitive both to bound molecular charges and to free charge carriers in materials. A muon study to investigate the charge distribution within a composite dielectric - consisting of epoxy, mica and glass fibre components- as a function of the externally applied electric field strength (E-field) is reported. Implanted muons react with the host epoxy molecule, undergo chemical addition at specific locations and probe the local electronic structure. Muon spectra are interpreted through a comparison with the electronic structure calculated using Density Functional Theory.It is shown that the application of an external E-field modifies the form of the observed spectra. It is believed that the effect of an E-field on identified bound charges within the molecule is being observed, suggesting muons are an excellent probe for understanding local charge redistributions in polymeric dielectrics.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"64 1","pages":"562-565"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75549321","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}

引用次数: 0

Effect of Insulating Oil on Space Charge Characteristics of Oil-impregnated Paper Under DC Voltage 直流电压下绝缘油对油浸纸空间电荷特性的影响

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341880

Ganlin Mao, Shengtao Li, Shijun Li, Zhao Ge, Liuqing Yang, Liuhao Jiang

{"title":"Effect of Insulating Oil on Space Charge Characteristics of Oil-impregnated Paper Under DC Voltage","authors":"Ganlin Mao, Shengtao Li, Shijun Li, Zhao Ge, Liuqing Yang, Liuhao Jiang","doi":"10.1109/ICD46958.2020.9341880","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341880","url":null,"abstract":"At present, the oil-paper insulation structure is mainly composed of traditional mineral oil and cellulose insulation paper. The hots pot of future research is to select better insulation oil to improve the overall insulation life of the system. Compared with traditional mineral insulation oil, gas to liquid(GTL) oil made from base oil refined by natural gas liquefaction technology by Fischer-Tropsch(FT) method are characterized by high oxidative stability and low sulfur content. In this paper, the space charge accumulation, distribution and attenuation characteristics of oil-impregnated paper composed of GTL oil and traditional mineral oil were studied. The space trap energy level and trap density distribution of two oil-impregnated papers were obtained according to isothermal decay current(IDC) method. The experimental results show that in the voltage-on stage, traditional mineral oil-impregnated paper is more prone to charge injection and the injection speed is faster. In the voltage-off stage, the traditional mineral oil-impregnated paper attenuates the charge faster, and the GTL oil-impregnated paper has more residual charge. Moreover, the trap level of GTL oil-impregnated paper is deeper than that of traditional mineral oil-impregnated paper.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"51 1","pages":"443-446"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75709243","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}

引用次数: 0