2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)最新文献_第3页

Computation the Effective Dielectric Constant of Nano-Probe Local Surrounding by Solvatochromic Spectral Shift Measurement of Organic Dye Molecule 有机染料分子溶剂化变色光谱位移法计算纳米探针局部周围的有效介电常数

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796803

A. Stepko, P. Lebedev-Stepanov

{"title":"Computation the Effective Dielectric Constant of Nano-Probe Local Surrounding by Solvatochromic Spectral Shift Measurement of Organic Dye Molecule","authors":"A. Stepko, P. Lebedev-Stepanov","doi":"10.1109/ICDL.2019.8796803","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796803","url":null,"abstract":"Computer modeling the dielectric properties of the cucurbit [7]uril (CB [7]) cavity based on the Onsager-Liptay model was carried out by analyzing the solvatochromic shift of the absorption spectrum of 1-(3ammoniumpropyl) -4-[(E) -2-(3,4-dimethoxyphenyl) ethynyl]pyridinium upon the formation of the inclusion complex with CB [7] in a water solution. The CB [7] cavity was considered as a polar environment into which the dye chromophore is placed. Positions of the maxima of the dye absorption spectra were measured experimentally in the following solvents: methanol, ethanol, i-propanol, n-butanol and water with known dielectric and optical properties. These values were used for parametrization of the Onsager-Liptay equation. Quantum-chemical calculations were used to determine molecular structures, dipole moments of the ground and excited states, and polarizability of the dye. Theoretical value of the effective dielectric permittivity of the cavity is in good agreement with the literature data derived by another method. Thus, we propose a new method for investigation the dielectric constant both in bulk liquids and in very small liquid volumes, for example, into picoliter droplets.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123555312","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

Advances in Measuring Partial Discharge in Insulating Liquids 绝缘液体局部放电测量的研究进展

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796779

L. Calcara, M. Pompili, S. Sangiovanni, B. Pfeiffer, T. Renaudin, T. Welfonder

引用次数: 2

Space Charge Effect On The Electrophysical Characteristics Of Liquid Dielectrics 空间电荷对液体电介质电物理特性的影响

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796821

B. Dikarev, G. Karasev, S. Sokolovsky, Oleksii Karasev

{"title":"Space Charge Effect On The Electrophysical Characteristics Of Liquid Dielectrics","authors":"B. Dikarev, G. Karasev, S. Sokolovsky, Oleksii Karasev","doi":"10.1109/ICDL.2019.8796821","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796821","url":null,"abstract":"Liquid dielectrics are extensively used as an insulating and heat transfer agent in electrical apparatus. The electophysical properties of these insulating liquids are of vital importance to the service life of electrical equipment and have become increasingly important as operating voltages have increased to 500 kV and above and internal equipment spacing has decreased. We initially studied the current time characteristics of benzene, toluene and carbon tetrachloride under dc electric stress. The results demonstrated that the current decreased with the time, what could be explained by the creation of space charge near the electrodes. Current-voltage characteristics were constructed for different times of electrical field application. We have also conducted measurements of discharge currents, which led to obtaining the values of diffusion coefficient and space charges. From the reversal currents investigations it is possible to calculate the mobility of charge carriers. We added also the new data about reversal currents in hydrolique liquids. The model explaining the dependence of the resistivity on the distance between the electrodes is proposed.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114586030","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

Fire simulation tests of mineral oil and natural esters transformers 矿物油和天然酯变压器的火灾模拟试验

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796788

M. Mazzaro, D. De Bartolomeo, M. Pompili, L. Calcara, S. Sangiovanni, F. Scatiggio, A. Valant, M. Rebolini, A. Ledda, E. Bemporad, S. Berardi, F. Mauri, M. Salvadori, A. Sturchio, M. Falconi

{"title":"Fire simulation tests of mineral oil and natural esters transformers","authors":"M. Mazzaro, D. De Bartolomeo, M. Pompili, L. Calcara, S. Sangiovanni, F. Scatiggio, A. Valant, M. Rebolini, A. Ledda, E. Bemporad, S. Berardi, F. Mauri, M. Salvadori, A. Sturchio, M. Falconi","doi":"10.1109/ICDL.2019.8796788","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796788","url":null,"abstract":"This paper describes the work carried out by the Italian Institutional Working Group on Natural Esters; this Group has been promoted by the University of Roma ”La Sapienza”, the National Firefighters Authority, the National Institute for Insurance against Accidents at Work (INAIL) and the Department for Geological Survey of Italy (ISPRA) with the objective of further validating the real possibility of risk mitigation for humans and environment through a more widespread use of a new generation of transformers insulated with natural ester liquids. A useful contribution to the activities of the Italian Institutional Group on Natural Esters has been also given by the participation of some of the major players in the electrical sector, such as: Italian TSO, main Distributors, Natural Ester producers and transformer manufacturers. The development of this Italian Group at international level has been the set-up of the CIGRE WG D1.68 “Natural and synthetic esters - Evaluation of the performance under fire and the impact on environment”, which is actually preparing a report on this subject. The present paper reports the main results of experimental comparative fire simulations of both mineral oil and natural esters distribution transformers.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123504220","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

Insulation Characteristics of Spacer Filled with Different Gas insulating mediums Under Superimposed Voltage of DC and Impulse 不同气体绝缘介质填充间隔片在直流和脉冲叠加电压下的绝缘特性

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796770

Jingrui Wang, Zhiyuan Wang, Jian Wang, Yanan Chang, Qiuxiang Hu, Xiaoru Ni, Qingmin Li

{"title":"Insulation Characteristics of Spacer Filled with Different Gas insulating mediums Under Superimposed Voltage of DC and Impulse","authors":"Jingrui Wang, Zhiyuan Wang, Jian Wang, Yanan Chang, Qiuxiang Hu, Xiaoru Ni, Qingmin Li","doi":"10.1109/ICDL.2019.8796770","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796770","url":null,"abstract":"The analysis of the influence of different dielectric gases on the flashover characteristics of insulators under DC voltage superimposed impulse voltage is mainly performed in this paper. In the experiment, the spacer surface charge is saturated by applying DC voltage under working temperature in advance. The flashover experiments were conducted with and without linear metal particle in pure $mathrm {SF_{6}, C_{4}F_{7}N/CO_{2}}$(4%/96%) and $mathrm {SF_{6}/N_{2}}$ (20%/80%) gas mixtures. At the same time, the surface potential distribution was measured and analyzed. The results show that the type of the gas medium is not the dominant factor of potential distribution without particle, and there is little difference in different gas environments. When metal particle defects appear on spacer surface, it will cause severe potential distortion and these regions are located around the tip of the particle and coincide with the flashover path. It also has proved that the gas insulating medium has influence on the surface charge accumulation in this circumstance. In $mathrm {C_{3}F_{7}CN/CO_{2}}$ mixture, the minimum potential value is 9954.86V, which is lower than that of others, and the decline percentage of flashover voltage is 16.82%. These indicate that $mathrm {C_{3}F_{7}CN/CO_{2}}$ is better than SF6 and its mixed gas in some respects.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130052680","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

FTIR and X-Ray photoelectron spectral (XPS) evidence for interaction between natural ester and cellulose paper FTIR和x射线光电子能谱(XPS)证明了天然酯和纤维素纸之间的相互作用

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796589

Sohan S. Beldar, Rohit Dolasiya, Girish A Morde, C. Narasimhan

引用次数: 1

Moisture in power transformers DFR analysis – real cases studies on site 电力变压器DFR中的水分分析-现场实际案例研究

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796689

Omar Amirouche

{"title":"Moisture in power transformers DFR analysis – real cases studies on site","authors":"Omar Amirouche","doi":"10.1109/ICDL.2019.8796689","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796689","url":null,"abstract":"Dielectric Frequency Response Test (DFR) – FDS-Frequency Domaine Spectroscopy) of power transformers is a diagnostic tool used to assess the dielectric properties as moisture in insulating system paper and oil, power factor, oil conductivity, etc..) in the frequency range from 0.05 mHz to 1 kHz.In this paper we have selected some real case studies on some power transformers that presented problems in the insulating system during the monitoring phase on the one hand, and on the other hand, we have studied the restoration of such anomalies with targeted corrective actions aimed at improving the residual life of the transformer. In particular the following case studies are reported:–two twin transformer of 150 MVA with high furanics compounds (2FAL);–an autotransfo of 5 MVA after coils replacement in manufacturer workshop.–a transformer of 8 MVA – 132/6 kV with high moisture (6%) in paper and high dissipation factor–under vaccum reconditioning up to moisture in paper about 3 %. The advantages / effectiveness of the DFR analysis compared to the analysis of the oil standard (Karl Fisher method):•Determines the water content in the solid-paper insulation without opening the transformer•Eliminates the problem related to the interpretation of moisture in the oil and solid insulating part (active part) of the transformer.•Allows the monitoring of the paper moisture treatment, its extraction (% by weight), and the limit below which to stop the treatment.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134117530","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

Conical structures on the surface of a liquid with ion current in the space-charge limited mode 具有空间电荷限制模式离子电流的液体表面的锥形结构

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796820

M. Belyaev, N. Zubarev, O. Zubareva

引用次数: 1

Diagnosis of Moisture Content in Oil-immersed Paper Based on Dielectric Loss with Variable Voltage at Power Frequency 基于工频变电压介质损耗的油浸纸含水率诊断

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796808

Haoxiang Zhao, Yang Li, Jia-ye Wen, Xiaowei Liu, Yanhua Han, Lu Zhang, H. Mu, Guanjun Zhang

{"title":"Diagnosis of Moisture Content in Oil-immersed Paper Based on Dielectric Loss with Variable Voltage at Power Frequency","authors":"Haoxiang Zhao, Yang Li, Jia-ye Wen, Xiaowei Liu, Yanhua Han, Lu Zhang, H. Mu, Guanjun Zhang","doi":"10.1109/ICDL.2019.8796808","DOIUrl":"https://doi.org/10.1109/ICDL.2019.8796808","url":null,"abstract":"this paper studies the dielectric property of oilpaper in high electric field, especially the effect of moisture on the dielectric loss under variable voltage at power frequency in oil-immersed paper with different moisture content. Oil-immersed paper insulation model samples with different moisture content are prepared in laboratory. Afterwards, increasing voltage and decreasing voltage tanδ-U curves of samples with different moisture content were tested under different experiment condition and a non-linear phenomenon was observed. Test results show that the tanδ-U curve is influenced by the moisture content of oil-immersed paper and test temperature. When the moisture content in the oil-immersed paper is high, the tanδ-U value is gradually increasing with the increase of the voltage. And in the process of decreasing the voltage, the tanδ-U value gradually decreases but is greater than the value at the same voltage in the process of increasing the voltage. The decreasing voltage tan tanδ-U curve is above the increasing voltage tan tanδ-U curve while these two curves overlap at high voltage and have great separation at low voltage. Moisture content changes the overall shape of the curve and the area between the two curves by influencing the transfer of charge carriers in oil-immersed paper. As water is polar, energy level and density of the trap in the oil-immersed paper with different moisture content are different. Water provides more paths for free moving charge carriers so that the accumulation and dissipation velocity of the charge carriers in Oil-immersed paper vary. The temperature doesn’t change the overall shape of the tanδ-U curve. Based on the dielectric response, the tanδ-U curve of samples with different moisture content could be expounded and the moisture Content in oil-paper insulation equipment could be evaluated by the tanδ-U curve.","PeriodicalId":102217,"journal":{"name":"2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132094153","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

Numerical study of electrically induced flow by conduction mechanism in a blade-plane configuration 叶片-平面结构中传导机制的电诱导流动数值研究

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI: 10.1109/ICDL.2019.8796680

P. Traoré, C. Louste, U. Seth, P. Vázquez, J. Yagoobi

引用次数: 1