2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)最新文献_第10页

Electrical Aging Tests on Conventional and Nanofilled Impregnation Resins 常规和纳米填充浸渍树脂的电老化试验

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544725

F. Guastavino, C. Gianoglio, E. Torello, M. Ferraris, W. Gianelli

{"title":"Electrical Aging Tests on Conventional and Nanofilled Impregnation Resins","authors":"F. Guastavino, C. Gianoglio, E. Torello, M. Ferraris, W. Gianelli","doi":"10.1109/CEIDP.2018.8544725","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544725","url":null,"abstract":"The main insulating system components of stator windings of rotating electrical machines are organic enamel and impregnating resin. When power electronic converters supply motors, the stator insulation system is subjected to voltage waveforms such as PWM composed by trains of pulses. Due to reflection phenomena, overvoltage can be associated to pulsed waveforms and partial discharge (PD) activity can incepts leading to the insulating system failure in short time. In this work two types of conventional and nanofilled impregnating resins, based on unsaturated polyester and solvented alkydic resin matrices, have been compared. Suitable twisted pair samples prepared by means of wires insulated with conventional enamel and by two impregnating resins have been tested. The twisted pair samples have been subjected to sinusoidal voltage waveforms, having amplitudes slightly higher than the Partial Discharge Inception Voltage. Aging tests have been performed until the insulating system breakdown, which is assumed as end-point criterion: during the tests, the PD activity has been monitored by means of a PRPDA system. For each sample, starting from the PD signals post processing, the apparent current of positive discharges has been considered: this derived quantity showed a linear behavior with the degradation time. In order to define a life model, the slopes of the straight lines have been put in relation with the related lifetimes by means of the inverse power law.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116439167","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: 3

Time-Dependent Electric Field Distribution during Load Cycle Test for HVDC MI Cable 高压直流MI电缆负荷循环试验时电场分布

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544914

Ik-Soo Kwon, Sun-Jin Kim, Jae-Hong Koo, Bang-wook Lee

{"title":"Time-Dependent Electric Field Distribution during Load Cycle Test for HVDC MI Cable","authors":"Ik-Soo Kwon, Sun-Jin Kim, Jae-Hong Koo, Bang-wook Lee","doi":"10.1109/CEIDP.2018.8544914","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544914","url":null,"abstract":"A pure resistive field distribution in DC steady state is entirely determined by an electrical conductivity of insulating material. However, in the case of transient state such as load cycle test, an influence of both the electrical conductivity and the dielectric permittivity should be essentially considered to obtain an accurate time-dependent field distribution. Therefore, in this paper, in order to evaluate this phenomenon, the characteristics of intermediate field were investigated by performing numerical analysis in load cycle test. In addition, an electric field analysis according to a temperature dependency coefficient was carried out to compare time-varying field distributions. From the result, it is found that the maximum field intensity at cooling cycle was rather higher than heating cycle. It is because both conduction current and polarization current are the significant factors in determination of the intermediate field distribution during load cycle test. It was confirmed that the time point at which the maximum electric field intensity occurred was delayed according to temperature dependence coefficient became smaller.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123447252","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

Improvement of Space Charge Behaviors of PP/ULDPE Blends by Nano Graphene for HVDC Cable 用纳米石墨烯改善高压直流电缆用PP/ULDPE共混物的空间电荷行为

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544820

Z. H. Hau, B. Du, J. Li, Z. L. Li, C. Han, R. R.Xu, M. Y. Wang, M. Fu, S. Hou, B. Hui

{"title":"Improvement of Space Charge Behaviors of PP/ULDPE Blends by Nano Graphene for HVDC Cable","authors":"Z. H. Hau, B. Du, J. Li, Z. L. Li, C. Han, R. R.Xu, M. Y. Wang, M. Fu, S. Hou, B. Hui","doi":"10.1109/CEIDP.2018.8544820","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544820","url":null,"abstract":"Polypropylene (PP) with excellent dielectric properties will make a further progress for its application in HVDC cables, if its poor toughness can be improved. Besides, the space charge accumulation is still an important issue for HVDC cable polymer insulation, which can cause a distortion of electric field, accelerate the ageing of insulation. In this paper, PP is blended with the elastomer of ultralow density polyethylene (ULDPE) content of 15wt% by melt blending method to modify its stiffness and brittleness. The graphene nanoplatelets with different content of 0, 0.005, 0.01wt% are introduced into the PP/ULDPE (15 wt%) blends to improve its dielectric properties. The dc conductivity, space charge behaviors and breakdown strength of PP/ULDPE/graphene nanocomposites are then investigated. Experimental results show that PP/ULDPE/graphene nanocomposites with the nanofiller content of 0.01 wt%, have lower dc conductivity, less space charge amount and higher breakdown strength. The improved dielectric properties can be attributed to the interfacial zones between graphene nanoplatelets and PP/ULDPE blends, which can restrict the carrier injection and transportation in polymer.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"7 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120857674","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

Effects of Sample Adhesives Acoustic Properties on Spatial Resolution of Pulsed Electroacoustic Measurements 样品胶粘剂声学特性对脉冲电声测量空间分辨率的影响

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544848

Z. Gibson, J. Dennison, L. Pearson, E. Griffiths, A. Pearson, V. Griseri

{"title":"Effects of Sample Adhesives Acoustic Properties on Spatial Resolution of Pulsed Electroacoustic Measurements","authors":"Z. Gibson, J. Dennison, L. Pearson, E. Griffiths, A. Pearson, V. Griseri","doi":"10.1109/CEIDP.2018.8544848","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544848","url":null,"abstract":"The media chosen to couple the PEA stack (electrode/sample/sensor/backing) can affect the spatial resolution and shape of the response from a Pulsed Electroacoustic (PEA) system significantly. The PEA stack layers must be electrically and acoustically coupled to optimize the amplitude, quality, and spatial resolution of the PEA measurements. Various coupling layer materials were used with 250 μm thick polymethylmethacrylate (PMMA) samples and a standard ~10 μm thick PVDF sensor. Coupling layers tested in this study include no media (with substantial pressure applied), light machine oil, silicone oil, and cyanoacrylate (super glue). Pulse amplitudes of 2000 V and 5 ns width were used. Static 8 kV DC bias was applied to the sample in order to detect a signal, as the samples were initially free of charge, and to see the interfaces more clearly and showcase the differences in response from the various coupling media. The best option was found to be a single layer of cyanoacrylate at the ground electrode-sample interface; this is the only viable option for in vacuo PEA measurements of the media tested.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125407588","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

Estimation of Partial Discharge Inception Voltage under Repetitive Inverter Surge Voltage by Volume-Time Theory 用体积-时间理论估计逆变器重复浪涌电压下局部放电起始电压

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544814

Naoki Hayakawa, Y. Daicho, T. Kaji, Hiroki Kojima

引用次数: 3

Improving the Charge/Discharge Efficiency and Dielectric Breakdown in High Temperature Polymer Dielectrics 提高高温聚合物电介质的充放电效率和介质击穿

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544748

Xin Chen, Tian Zhang, Q. Zhang

引用次数: 0

Optimized Arrival Time Determination of UHF Pulses for Localization of Partial Discharges in Power Transformers 电力变压器局部放电定位中超高频脉冲到达时间的优化确定

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544757

M. A. Azirani, M. Ariannik, P. Werle, A. Akbari

引用次数: 4

Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions 核电厂安全相关电缆在模拟事故条件下的老化状态分析

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544872

T. Minakawa, M. Ikeda, N. Hirai, Y. Ohki

{"title":"Aging State Analysis of Safety-related Cables for Nuclear Power Plants Exposed to Simulated Accident Conditions","authors":"T. Minakawa, M. Ikeda, N. Hirai, Y. Ohki","doi":"10.1109/CEIDP.2018.8544872","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544872","url":null,"abstract":"Several cables in safety-related systems in nuclear power plants are required to maintain their intended electrical insulating function while they are exposed to harsh environmental conditions in the primary containment vessel during assumed accidents. This must be satisfied even after the cables are operated for their full service period. For such cables, the behavior of their insulation under accidents is a matter of concern. In this research, after silicone rubber insulated cables were pre-aged by simultaneous thermal and radiation exposure, they were irradiated or exposed to high temperature steam to simulate the environmental conditions during the accident, or subjected to the combination of these conditions. The resultant changes in various properties were analyzed by instrumental analyses. As a result, it has been confirmed that the pre-aging and radiation exposure induce cross-linking and depolymerization of siloxane chains to produce cyclic siloxanes, whereas the steam exposure causes significant depolymerization and the generation of low-molecular cyclic siloxanes.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134097466","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: 6

Effect of the Non-Linear Electric Conductivity of Mineral Insulating Oil on the Dielectric Strength at High DC Voltage Stress 高直流电压应力下矿物绝缘油非线性导电性对介电强度的影响

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544845

T. Gabler, K. Backhaus, T. Götz, Steffen Groβmann, R. Fritsche

引用次数: 1

Suppression of Dry-Band Arcing Erosion by Silica Filler in Silicone Rubber Composites 硅填料对硅橡胶复合材料干带电弧侵蚀的抑制作用

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI: 10.1109/CEIDP.2018.8544861

D. Kone, L. Cissé, R. Ghunem, Y. Hadjadj, A. El-Hag, K. N. Bangash

{"title":"Suppression of Dry-Band Arcing Erosion by Silica Filler in Silicone Rubber Composites","authors":"D. Kone, L. Cissé, R. Ghunem, Y. Hadjadj, A. El-Hag, K. N. Bangash","doi":"10.1109/CEIDP.2018.8544861","DOIUrl":"https://doi.org/10.1109/CEIDP.2018.8544861","url":null,"abstract":"This paper investigates the effects of silica filler on the suppression of the dry-band arcing erosion of silicone rubber outdoor insulating materials. Liquid silicone rubber which was filled with silica at various levels and particle sizes were prepared and tested in the AC inclined plane test as per IEC 60587. The application of the 4.5 kV rms critical test voltage is shown essential in order to realize an effect for the filler throughout the study. Higher erosion resistance is obtained for composites containing higher loading level and larger particle size of silica filler, as indicated by the relative degree of surface damage and the measured level of the erosion depth. A simultaneous thermogravimetric and differential thermal analysis is conducted for elucidating the responsible roles of silica filler. Volume effect of silica filler replacing the polymer in the silicone rubber matrix appears to have a significant effect as reaching a loading level of 50 wt%. In addition, significant increase in the char amount is shown as reaching a silica particle size of 5 μm. Char, resulted as a byproduct of silicone rubber decomposition, is speculated to have a significant role in the suppression of further erosion from taking place during inclined plane test.","PeriodicalId":377544,"journal":{"name":"2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129936589","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