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

PD-Activity in Generator Stator Bar insulation versus Voltage Frequency and Temperature 发电机定子棒绝缘的pd活性随电压、频率和温度的变化

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341874

T. Aakre, E. Ildstad

{"title":"PD-Activity in Generator Stator Bar insulation versus Voltage Frequency and Temperature","authors":"T. Aakre, E. Ildstad","doi":"10.1109/ICD46958.2020.9341874","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341874","url":null,"abstract":"Condition assessment of generators is today performed at various voltage frequencies and test temperatures. The main purpose of this paper is to compare measured PD results from sections of generator bars with that of similar tests performed on laboratory made test objects with void enclosures of known geometry. The test objects were subjected to ac voltage in the frequency range from 0.1 to 300 Hz, increasing in steps up to a maximum of 10 kV. The measured values of partial discharge inception voltages (PDIV), apparent charge magnitude and number of PDs were compared to estimated values in the temperature range of 20° to $155^{circ}mathrm{C}$ using an impedance abcmodel, including both conduction and dielectric response. It was found that the capacitive abc-model sufficiently accurately describes the observed PDIV values at temperatures below $100^{circ}mathrm{C}$ and test frequencies below 50 Hz. At temperatures higher temperatures the measured PDIV values were found to decrease with increasing temperature, particularly so at the lowest test frequencies. This is in agreement with the assumption of increased conductivity and higher rate of polarization at increased temperatures. The high number of low magnitude PDs, strongly indicating that several discharges are needed for a complete discharge of a void surface.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"1 1","pages":"870-873"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83561522","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

New chemistry for impregnation of HV machines: influence of compatibility between resin and mica tapes 高压浸渍机的新化学:树脂与云母带相容性的影响

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341930

M. Ferraris, T. J. Murray, M. Viola

{"title":"New chemistry for impregnation of HV machines: influence of compatibility between resin and mica tapes","authors":"M. Ferraris, T. J. Murray, M. Viola","doi":"10.1109/ICD46958.2020.9341930","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341930","url":null,"abstract":"European regulation changes have pushed electric machine manufacturers to request new materials suitable for impregnation of High Voltage motors and generators that are also compliant with European health restrictions. Until now, the most widely used materials for coils insulation are a blend of epoxy resin and anhydride that impregnates mica tapes, containing an epoxy binder with a Zinc naphthenate catalyst, which has the advantage of stability in storage tanks and good thermal and electrical properties. The development of a new impregnating resin, made with a hybrid epoxy-polyester chemistry, highlighted the need to find a way to improve compatibility with mica tapes. This new resin / tape combination has been visually evaluated, as first step, and then tested on bars, observing how dissipation factor versus voltage change after thermal ageing at high temperatures. Test bars made with new resin/tape combination withstood thermal ageing for a longer time than reference materials, confirming that compatibility between impregnating resin and mica tapes is a crucial factor influencing thermal resistance of a coil main wall insulation system.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"35 1","pages":"685-688"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86438373","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

Ageing Behaviours of Superhydrophobic and Icephobic Coatings on Overhead Line Systems 架空线路系统超疏水和疏冰涂层的老化行为

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341809

Chengxing Lian, Xu Zhang, C. Emersic, I. Cotton

引用次数: 2

Research Progress on Modification of Epoxy Resin Materials for High-Voltage Electrical Equipment 高压电器用环氧树脂材料改性研究进展

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341831

Y. Wang, Ang Li, J. Li, W. Zhang, Q. Du, M. M. Zhang, Z. H. Wang, H. C. Liang, B. Du

引用次数: 1

Epoxy composite with hBN fillers compatible with industrial application in electrical equipment 环氧复合材料与hBN填料兼容的工业应用在电气设备

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341949

S. Haller, Damien Bachellerie, S. Pruvost, Loriane Desmars, S. Iglesias, J. Galy, G. Robert, Christian Lao, A. Girodet, M. Henriksen

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

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

Partial Discharge Erosion of Polypropylene/Elastomer Blends Characterized with Multi-Sensors under AC Voltage 交流电压下多传感器表征聚丙烯/弹性体共混物局部放电侵蚀

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341807

Jinjing Peng, Yu Gao, Jing Li, Xuri Xu, Zheng Song, B. Du

{"title":"Partial Discharge Erosion of Polypropylene/Elastomer Blends Characterized with Multi-Sensors under AC Voltage","authors":"Jinjing Peng, Yu Gao, Jing Li, Xuri Xu, Zheng Song, B. Du","doi":"10.1109/ICD46958.2020.9341807","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341807","url":null,"abstract":"Polypropylene (PP) has been considered as a promising insulation material for power cable in both AC and DC systems because of its excellent insulation performance and recyclability. The exposure to partial discharge gives rise to the deterioration of the material that threatens the safe operation of cable. Therefore, it is of great significance to understand the mechanism of partial discharge of PP and its blends subjected to AC voltage. In this work, PP/elastomer blends with thickness of $150 mu mathrm{m}$ were prepared as samples. A needle-plane electrode system was employed to introduce partial discharge by applying an AC voltage with 5 kVrms for 2 hours. The erosion behavior was characterized through multi-sensors system, including high frequency current transformer (HFCT), optical recorder and gas sensor. To better understand the erosion mechanism, isothermal surface potential decay (ISPD) method was used to analyze trap characteristics. The results showed that the trap center became shallower with the increase of elastomer content for both ethylene-octene copolymer elastomer (EOC) and polypropylene based elastomer (PBE). Compared with pure PP, the addition of elastomer improved the resistance of partial discharge and PP with 20 wt% loading percent of EOC presented better resistance to partial discharge compared with PP with 20 wt% loading percent of PBE.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"95 1","pages":"890-893"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85723348","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

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

Effect of sPP Content on Dielectric Relaxation and Trap Level Characteristics of PP blend insulation sPP含量对PP共混绝缘介电弛豫和陷阱能级特性的影响

2020 IEEE 3rd International Conference on Dielectrics (ICD) Pub Date : 2020-07-05 DOI: 10.1109/ICD46958.2020.9341925

M. Fan, Zhonglei Li, B. Du, S. Zhou

{"title":"Effect of sPP Content on Dielectric Relaxation and Trap Level Characteristics of PP blend insulation","authors":"M. Fan, Zhonglei Li, B. Du, S. Zhou","doi":"10.1109/ICD46958.2020.9341925","DOIUrl":"https://doi.org/10.1109/ICD46958.2020.9341925","url":null,"abstract":"Polypropylene (PP) is regarded as a recyclable alternative to XLPE for cable insulation on account of its higher heat resistance and higher electrical resistivity. The dielectric relaxation and trap level characteristics of isotactic PP (iPP), syndiotactic PP (sPP) as well as atactic PP (aPP) blends are investigated. The associations between polymer polarization response and traps level characteristics of PP blends are discussed. Frequency-domain dielectric spectroscopy (FDS) methods are used to analyze the polarization response of five PP blends at 50, 70 and 90 0C. Isothermal surface potential decay (ISPD) tests are performed to acquire the traps level distribution and the influences of traps level characteristics on the dielectric response are discussed. The polymer polarization behaviours a and $delta$ of five samples is closely related to segmental movements and carriers hopping behaviours, separately. The intensity of a relaxation strength ($Deltavarepsilon_{a}$) declines with the increase of sPP content, because the related coefficient (g) between PP molecular chains is reduced. The calculated energy $E_{tau}$ for $delta$ process is in proportion to the shallow traps level, because the shallow traps with a higher level increase the potential barriers of carriers hopping behaviors. The increase in temperature causes the dipole to undergo intense Brownian motion in the electric field, resulting in a decrease in $Deltavarepsilon_{a}$ with increasing temperature. The thermal motion of the charge increases the mobility of carriers in the PP and causes $Deltavarepsilon_{delta}$ to increasewith increasingtemperature.","PeriodicalId":6795,"journal":{"name":"2020 IEEE 3rd International Conference on Dielectrics (ICD)","volume":"43 1","pages":"431-434"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86911218","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