2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena最新文献_第7页

Accurate temperature correction of dissipation factor data for oil-impregnated paper insulation bushings: Field experience 油浸纸绝缘套管耗散系数数据的精确温度校正:现场经验

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232644

D. Robalino

{"title":"Accurate temperature correction of dissipation factor data for oil-impregnated paper insulation bushings: Field experience","authors":"D. Robalino","doi":"10.1109/CEIDP.2011.6232644","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232644","url":null,"abstract":"Typically, dissipation factor (DF) or power factor (PF) test is carried out in the field following well known procedures. It is not necessary to emphasize the importance of dielectric test for power system operators. Accurate recording of insulation temperature values during the test is critical but not always feasible in the field. DF measured values are later normalized to a 20°C base for future comparison and trending. Nevertheless, as stated in several international publications, accuracy of temperature correction is still under investigation because temperature correction factors (TCF) from reference tables do not consider the percentage moisture concentration of the insulation system. The existing Temperature Correction Tables correspond to a variety of insulation materials and construction of different high voltage electrical equipment and components. Therefore, the application of state-of-the-art technologies to determine “specific” temperature correction factors for DF, is essential to provide reliable interpretation of results and proper equipment condition assessment. Frequency Domain Spectroscopy (FDS) in conjunction with DF Analysis are a powerful tool to determine the percentage moisture concentration in solid insulation capable to estimate Individual Temperature Compensation (ITC) of DF measured data of power transformers. Throughout this document, field experience is summarized when a three-winding transformer is removed from service and put to a series of testing procedures including DF, FDS and tip-up test on the high voltage bushings. Results of the analysis, experimental data and conclusions made based on the obtained results are presented herein.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"43 1","pages":"251-254"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87338016","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: 12

Electrical breakdown strength characteristics of palm kernel oil ester-based dielectric fluids 棕榈仁油酯基介电流体的电击穿强度特性

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232627

A. Abdelmalik, J. Fothergill, S. Dodd

引用次数: 10

PD behaviour of basic test arrangements under different measurement and evaluation conditions 在不同的测量和评估条件下，基本测试安排的PD行为

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232650

R. Haller, J. Pihera, Petr Mraz, Stefan Kornhuber, M. Boltze

{"title":"PD behaviour of basic test arrangements under different measurement and evaluation conditions","authors":"R. Haller, J. Pihera, Petr Mraz, Stefan Kornhuber, M. Boltze","doi":"10.1109/CEIDP.2011.6232650","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232650","url":null,"abstract":"The PD behaviour of so called basic test arrangements as for corona discharge or other discharge sources seems to be well known from the physical side of view. On the other hand the measurement results and, in the same manner, their identification and interpretation can be different, because this is depending on the measurement or evaluation conditions. Therefore some typical corona basic arrangements representing corona needle-plane, needle-plane with insulating material and needle-sphere are investigated. The measurements are carried out under different measurement conditions especially the selected frequency range of the measuring system. For some effects the reproducibly, the voltage dependence and the changes over time of the PD behaviour are investigated. These results were evaluated using the applied and the updated version of IEC 60270. Furthermore the IEC 60270 and additional publications provide a lot of possible of the post evaluation of the measured PD signals. In this paper the most and most recognized values are compared at the well defined laboratory set ups as defined. Additional these results are compared with the results of the Pulse-Sequence-Analyzing method. The presented results show surprisingly characteristic shapes of the PD pattern, which allow the better classification of the types of PD sources and their identification respectively.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1 1","pages":"275-279"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80714658","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: 4

Experimental studies of current distribution in stratified seawater under spark discharges 火花放电下分层海水中电流分布的实验研究

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232637

N. S. Midi, R. Ohyama

引用次数: 4

Quantum mechanical study of charge injection at the interface of polyethylene and platinum 聚乙烯-铂界面电荷注入的量子力学研究

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232777

A. Huzayyin, S. Boggs, R. Ramprasad

引用次数: 26

May the capacitance of power cables be an aging indicator? 电源线的电容是否可以作为老化指标?

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232596

S. Savin, S. Ait-Amar, D. Roger, G. Vélu

引用次数: 2

Evaluation of organic peroxide decomposition byproducts from incompletely crosslinked high voltage power cables 不完全交联高压电缆有机过氧化物分解副产物的评价

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232732

S. J. Han, J. Kjellqvist

{"title":"Evaluation of organic peroxide decomposition byproducts from incompletely crosslinked high voltage power cables","authors":"S. J. Han, J. Kjellqvist","doi":"10.1109/CEIDP.2011.6232732","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232732","url":null,"abstract":"In modern power cable design, crosslinked polyethylene (XLPE) is a major choice of insulation compound for distribution and transmission cables. Crosslinking will lead to enhance both dimensional stability at elevated temperatures and physical integrity under high electrical stress of the compounds for HV and EHV power cables. Thermal decomposition of organic peroxides from cable compounds in cable fabrication process will retain some of decomposition byproducts within the compounds, which increase dielectric loss and generate voids as cable defects. The productivity for the high quality power cable manufacturing depends on optimization of production rates from extrusion, thermal treatments for crosslinking and cooling, and degassing. In this study, it is investigated about distribution of various types of decomposition byproducts levels in XLPE insulation in high voltage cables under the incomplete crosslinking condition from the continuous vulcanization (CV) process. It is correlated for mechanical and crosslinking properties of the insulation. This can help to design practical byproducts degassing procedure for high quality power cables.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"100 1","pages":"615-619"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79500392","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

Ionic liquids induce crystalline β phase and ferroelectric polarization in sub-micrometer films of poly(vinylidene fluoride) (PVDF) 离子液体在聚偏氟乙烯(PVDF)亚微米薄膜中诱导晶体β相和铁电极化

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232755

Feipeng Wang, A. Lack, Zailai Xie, P. Frubing, W. Wirges, R. Gerhard

{"title":"Ionic liquids induce crystalline β phase and ferroelectric polarization in sub-micrometer films of poly(vinylidene fluoride) (PVDF)","authors":"Feipeng Wang, A. Lack, Zailai Xie, P. Frubing, W. Wirges, R. Gerhard","doi":"10.1109/CEIDP.2011.6232755","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232755","url":null,"abstract":"In this paper, ferroelectric poly(vinylidene fluoride) (PVDF) films with a thickness of about 430 nm were obtained by spin coating from a solution that contained a small portion of the ionic liquid 1-ethyl-3-methylimidazolium nitrate ([EMIM][NO3]). Before the experiments, the PVDF films were dried and thermally annealed. The sub-micrometer films on substrates show clear ferroelectric hysteresis behavior. A remanent polarization of about 60 mC/m2 was detected by means of two independent methods: Non-linear current-voltage characteristics and time-dependent current response after application of voltage steps. The coercive field decreases from 190 to 165 MV/m when the width of triangular bipolar/unipolar electric-field cycles increases from 3 to 300 ms. Quasi-static pyroelectricity increases from 14 to 18 μC/(m2 K) between -20 and +40 °C. X-ray diffraction prove that the ionic liquid enhances the crystallinity. The dipolar interaction between anions of the ionic liquid and CH2 groups in the PVDF chain during spin coating is considered to facilitate the formation of the β phase.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"43 1","pages":"710-713"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78931211","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 nanoparticle size on space charge behavior of EVA-TiO2 nanocomposites 纳米颗粒尺寸对EVA-TiO2纳米复合材料空间电荷行为的影响

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232661

D. Fabiani, G. Montanari, F. Palmieri

引用次数: 6

The effect of temperature on space charge behavior of epoxy resins containing both micro and nano sized fillers 温度对含微纳米填料的环氧树脂空间电荷行为的影响

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232740

D. Fabiani, G. Montanari, F. Palmieri, V. H. Camara, A. Krivda

引用次数: 8