2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)最新文献_第4页

Influence of cellulose contamination level on electrical conductivity of natural and synthetic ester liquids compared to mineral oil 与矿物油相比，纤维素污染水平对天然和合成酯液体电导率的影响

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124695

F. Vahidi, S. Haegele, S. Tenbohlen, K. Rapp, A. Sbravati

{"title":"Influence of cellulose contamination level on electrical conductivity of natural and synthetic ester liquids compared to mineral oil","authors":"F. Vahidi, S. Haegele, S. Tenbohlen, K. Rapp, A. Sbravati","doi":"10.1109/ICDL.2017.8124695","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124695","url":null,"abstract":"The design of feasible insulation for converter transformers requires the understanding of field distributions in insulating materials, which are normally a combination of oil and cellulose-based materials. The AC field distributions within the insulation system depend on permittivities of materials. Contrary to AC field distribution, DC field stresses are determined by conductivities of the insulating materials. Therefore, knowledge about the conductivity of the insulating liquid is of tremendous importance for design and safe operation in the HVDC transmission technology. The conductivities of insulating liquids depend on several parameters, e.g. time, temperature, particle type and contamination level, moisture content of liquid and electrical field strengths. In this contribution, the effect of different cellulose contamination levels on electrical conductivities of insulating liquids is presented for natural and synthetic ester liquids compared to mineral oil. The time behavior of electrical conductivity is studied adding different amounts of particles in a defined volume of liquids. The aim of this comparative study is to illustrate the electrical conductivity behavior of mentioned alternative liquids and their applicability as HVDC insulation. The measurements are performed using different types and amounts of dried and wet cellulose particles. In addition, the impact of moisture content of various particle levels on the liquids conductivity is measured. The results indicate an increase of electrical conductivity for higher contamination levels in the liquid samples. Moreover, the water content of cellulose contamination also leads to differences in electrical conductivities in the various insulating liquids.","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129328837","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

Study of water molecules state in transformer oil via FT-IR spectrum and molecular dynamic simulation 利用傅里叶红外光谱和分子动力学模拟研究变压器油中水分子状态

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124680

Chao Li, Qian Sun, Y. Lv, Lei Wang, Meng Huang, Chengrong Li, B. Qi

{"title":"Study of water molecules state in transformer oil via FT-IR spectrum and molecular dynamic simulation","authors":"Chao Li, Qian Sun, Y. Lv, Lei Wang, Meng Huang, Chengrong Li, B. Qi","doi":"10.1109/ICDL.2017.8124680","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124680","url":null,"abstract":"Mineral transformer oil has been widely used in the power transformers due to its good insulating property and thermal conductivity. It is well-known that water molecules in the oil have detrimental effect on its conduction and breakdown strength and tend to cause accelerated aging of oil and paper insulation system. The relation of the total amount of water to the electrical properties of oil has been widely investigated. A turning point of moisture content has been found that beyond this point the abrupt decrease of AC breakdown strength of oil is alleviated and keep almost constant with the further increasing of moisture content. Water state in saturated and unsaturated hydrocarbons and aromatic hydrocarbons have been studied and indicated that the state of water molecules is closely related to the electrical conductivity of hydrocarbons. Therefore, it is of great importance to investigate the water state in the mineral transformer oil with different moisture contents. In this paper, mineral transformer oil was treated at different humidity and Fourier transform infrared spectrometer (FT-IR) was used to characterize the water state of oil samples with different moisture contents. Moreover, the water state in the oil samples was investigated using a molecular dynamics simulation. By analyzing the formation of hydrogen bonds and the diffusion behavior of water molecules, it is found that the hydrogen bond energy is greatly changed by varying the moisture content of mineral oil, which lead to the change of the state of water clusters.","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127279959","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

Computational insights into carrier transfer and injection in liquid organic insulators 液体有机绝缘体中载流子转移和注入的计算见解

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124642

M. Sato, A. Kumada, K. Hidaka, T. Hirano, F. Sato

引用次数: 2

Experiences with detection of transformer failure based on insulating oil tests 有基于绝缘油试验的变压器故障检测经验

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124628

P. Rózga, T. Piotrowski, R. Kozak

引用次数: 6

A study of various inhibitor mixtures in natural ester oil 天然酯油中各种抑制剂混合物的研究

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124721

P. Totzauer, P. Trnka, V. Mentlík, J. Hornak, P. Kadlec, J. Ulrych, J. Pihera

{"title":"A study of various inhibitor mixtures in natural ester oil","authors":"P. Totzauer, P. Trnka, V. Mentlík, J. Hornak, P. Kadlec, J. Ulrych, J. Pihera","doi":"10.1109/ICDL.2017.8124721","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124721","url":null,"abstract":"The difficulty with the insulation oils is well known and it has been dealt with several years by now. Using the mineral oils as a transformer insulating fluid represents a thread to the environment. With a considerable amount of research, the biodegradable insulating fluids based on natural esters were developed and used as a replacement for mineral oil. Their main features are biodegradability, a good thermal and insulating features, a high fire resistance etc. Compared to the mineral oil, the fluids based on natural esters still have a problematic development of a trend of dissipation factor in the long-term period due to lower oxidative stability. This paper primarily presents a comparison of key dielectric parameters of clean natural ester insulation fluid (rapeseed oil) and several mixtures of this rapeseed oil with 1 wt% of different antioxidants. The aim of this paper is to choose the antioxidant which contributes to achieving the best dielectric parameters of oil based on the measurement of breakdown voltage, dissipation factor and real part of relative permittivity. The oil samples were also exposed to the elevated temperature to evaluate the oxidation stability based on values of dissipation factor. The results of these measurements under high voltage are also supplemented with a detailed analysis by broadband dielectric spectroscopy.","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131626186","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

Modified natural ester — prospective electrical insulating liquid 改性天然酯-未来电绝缘液体

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124720

J. Ulrych, P. Totzauer, V. Mentlík

引用次数: 3

EHD conduction pumping mechanisms in micro-sized systems 微尺寸系统中的EHD传导泵送机制

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124598

P. Vázquez, J. Seyed-Yagoobi, P. Traoré, C. Louste

引用次数: 3

Breakdown characteristic of natural ester gelling process under oxidation and its impact on fresh oil 氧化作用下天然酯胶凝过程的分解特性及其对鲜油的影响

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124719

Xin Li, Sen Qian, Xiaogang Xu, Jiajian Huang, Jinfeng Wang, Lu Ren, Yang Xu, Y. Liu

引用次数: 2

Effect of acid value on breakdown performance of vegetable insulating oil under lighting impulse 酸值对植物绝缘油光脉冲击穿性能的影响

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124649

Jian Li, Xiuping Chen, Yao Xu, Feipeng Wang, Xiang Lin, Suning Liang

{"title":"Effect of acid value on breakdown performance of vegetable insulating oil under lighting impulse","authors":"Jian Li, Xiuping Chen, Yao Xu, Feipeng Wang, Xiang Lin, Suning Liang","doi":"10.1109/ICDL.2017.8124649","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124649","url":null,"abstract":"Vegetable insulating oil is fire-resistant and environmental-friendly liquid dielectrics, which offers excellent electrical and physiochemical properties and has been successfully used in distribution transformers. Vegetable insulating oil differs from mineral insulating oil in their molecular structures, components, physicochemical and electrical properties. This lead to that the two kinds of oil have different acid composition. At the same time, vegetable oil-paper insulation will be affected by many factors such as heat, moisture and oxygen, which makes acidic substance produce more complex. Therefore, this paper explores the change law of acid value in vegetable insulating oil under the condition of hydrolysis, oxidation and aging, studies the influence of different acid value on breakdown performance on positive and negative polarity in small gaps under lighting impulse. The results show that acid value has a significant impact on negative polarity, the breakdown voltage will decrease with the increase of acid value, while it has no obvious influence on positive polarity in small gaps under lighting impulse.","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115166388","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

Chemometrics in the study of liquid dielectrics 化学计量学在液体电介质研究中的应用

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-01 DOI: 10.1109/ICDL.2017.8124653

G. Stevens, H. Herman, N. Freebody, I. Hosier, A. Vaughan

{"title":"Chemometrics in the study of liquid dielectrics","authors":"G. Stevens, H. Herman, N. Freebody, I. Hosier, A. Vaughan","doi":"10.1109/ICDL.2017.8124653","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124653","url":null,"abstract":"Chemometrics is the science of applying multivariate mathematical and statistical analysis methods to the extraction of maximal information from complex data sets and the determination of inter-relationships between variables controlling outcomes and properties. In this paper we present the application of these methods to a detailed dataset obtained on the oxidative and inert pyrolytic thermal aging of dodecylbenzene (DDB) liquid dielectrics. This data set formed part of extensive work by the University of Southampton on the ageing of DDB containing insulation systems. This dataset covers isothermal ageing from 90 to 135 °C with ageing time extending up to 3000 hours in air and nitrogen in the presence of aluminium, copper, paper or copper and paper which relate to the interest in these materials on ageing effects in power transformers and fluid filled cables. The DDB studied was largely comprised of common mixed isomer fluids but data was also examined for single isomer DDB. We illustrate the application where chemometrics operates on the infrared spectrum and relate the spectral information to the change in fluid chemistry on ageing and on resulting fluid metrics such as dielectric permittivity and loss, acid number and water content. We show how chemometric measurement models can be established and used to determine the precise condition of thermally aged fluids. The paper will conclude with a view of the future potential application of these methods in dielectric fluids research, manufacturing support and asset condition assessment linked to improved asset management","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131790332","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