2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)最新文献

Hydrodynamic parameters of air-bubble stimulated underwater spark discharges 气泡刺激水下火花放电的水动力参数

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-12-01 DOI: 10.1109/ICDL.2017.8124689

Y. Sun, I. Timoshkin, M. Given, M. Wilson, T. Wang, S. Macgregor, N. Bonifaci

引用次数: 2

Impulsive breakdown in water: Optimisation of energy delivery for high acoustic output 水中脉冲击穿:优化高声输出的能量输送

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-12-01 DOI: 10.1109/ICDL.2017.8124700

I. Timoshkin, Y. Sun, M. Given, M. Wilson, S. Macgregor, N. Bonifaci

{"title":"Impulsive breakdown in water: Optimisation of energy delivery for high acoustic output","authors":"I. Timoshkin, Y. Sun, M. Given, M. Wilson, S. Macgregor, N. Bonifaci","doi":"10.1109/ICDL.2017.8124700","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124700","url":null,"abstract":"The high voltage impulsive breakdown process in water is complex, with the nature of the impulsive breakdown depending upon the magnitude, polarity and rise time of the HV impulses, the water conductivity, and the electrode topology. In the case of μs and sub-μs high voltage impulses of sufficient magnitude, the breakdown develops through the formation of plasma streamers in the water. When the first streamer crosses the entire inter-electrode gap, the energy released in the breakdown channel transforms this channel into a gas/vapor cavity, which pulsates and radiates acoustic impulse(s). Optimisation of the hydrodynamic (period of cavity oscillation) and acoustic (peak magnitude of the acoustic impulse(s)) parameters is required for practical applications of these underwater spark discharges. The present paper analyses the functional behavior of the period of cavity oscillation and the peak magnitude of the acoustic impulse for spark discharges generated by self-triggered underwater discharges (free discharges), spark discharges triggered by air bubbles injected into the inter-electrode gap, and wire-guided discharges. The advantages and limitations of these methods of generation of underwater acoustic impulses by spark discharges are discussed.","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125258161","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

DC-conductivity of insulating oil at lower temperatures 绝缘油在低温下的直流导电性

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-25 DOI: 10.1109/ICDL.2017.8124608

Patrickc Rlrnnpelt, Erwin Burkhardt, F. Jenau

引用次数: 0

Investigation of interfacial surface creep breakdown at oil-pressboard interfaces in natural ester liquid and mineral oil 天然酯类液体和矿物油中油压板界面表面蠕变破坏的研究

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-25 DOI: 10.1109/ICDL.2017.8124605

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

{"title":"Investigation of interfacial surface creep breakdown at oil-pressboard interfaces in natural ester liquid and mineral oil","authors":"S. Haegele, F. Vahidi, S. Tenbohlen, K. Rapp, A. Sbravati","doi":"10.1109/ICDL.2017.8124605","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124605","url":null,"abstract":"Natural ester liquids are increasingly established in power transformers, especially if the water protection and prevention of fire hazard in operation region of transformer are in focus. They show a comparable dielectric strength to mineral oil in homogeneous and slightly inhomogeneous fields. Nevertheless, differences exist between natural ester liquids and mineral oils in terms of electrical properties. The different ratios of liquid and solid insulation materials permittivities at interfaces cause a shift in electric field distribution within the insulation system of a transformer. Therefore, it is important to explore the effects of interfacial surface creep breakdown strength at high stressed oil-paper interfaces inside power transformers. This will be called simply creep breakdown. This study investigates the creep breakdown along an oil-paper interface at defined oil gap in natural ester liquid and mineral oil. A high-density pressboard sheet is impregnated and prepared giving a vertical electrode gap for AC creep breakdown test setup. Pressboard is fixed within one rounded electrode at the upper end and within one rounded electrode at the lower end. Special care is taken in the electrode design to avoid / minimize possible oil wedges in the setup. Tests are conducted with dry oil at a relative moisture content of less than 12 % of saturation. Breakdown mean values, 2 % withstand values and standard deviations are compared. The empirical breakdown results and the measured differences between the insulation liquids are used to interpret the effects of electric stress shift in natural ester liquids on transformer design rules.","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"118 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114011711","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

Positive third mode streamers in insulating oil 绝缘油中的正第三模拖缆

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-25 DOI: 10.1109/ICDL.2017.8124601

D. Linhjell, L. Lundgaard, M. Unge

引用次数: 3

Impulse breakdown characteristic of mineral oil based nanofluid 矿物油基纳米流体的脉冲击穿特性

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-25 DOI: 10.1109/ICDL.2017.8124613

P. Muangpratoom, N. Pattanadech, A. Kunakorn, W. Vittayakorn

{"title":"Impulse breakdown characteristic of mineral oil based nanofluid","authors":"P. Muangpratoom, N. Pattanadech, A. Kunakorn, W. Vittayakorn","doi":"10.1109/ICDL.2017.8124613","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124613","url":null,"abstract":"Mineral-oil based nanofluids are proved that the addition of suitable nanoparticles can increases the AC breakdown voltage and Partial Discharge Inception Voltage (PDIV) compared with those of the unmodified mineral oil. In this paper, a standard impulse breakdown voltage of the mineral oil and the mineral-oil based nanofluids is investigated. Three types of nanoparticle, i.e., Zinc oxide (ZnO), Barium titanate (BaTiO3) and Titanium dioxide (TiO2) with the mean diameter less than 100 nm are used to prepare the nanofluid samples. The first group of the nanofluid sample consists of the mineral oil mixed with the 0.01% volume fraction of nanoparticle. Another group of nanofluid sample comprises the mineral oil mixed with the 0.03% volume fraction of nanoparticle. Besides, the surfactant sorbitan monooleate (Span 80) is added in order to modify the surface of the nanoparticles. The needle-sphere electrode configuration with the gap spacing of 15 mm is employed for impulse breakdown voltage investigation of the dielectric liquids. The test circuit is set up in accordance with IEC 60897, and the test experiment is performed at the room temperature. The results show that the addition of ZnO and TiO2 nanoparticle leads to the change in the impulse breakdown characteristics of the mineral oil in both positive and negative impulse polarities. However, no significant change in the impulse breakdown characteristics is observed when adding BaTiO3 to the oil.","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131895192","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

Determination of electrical characteristics of nanosecond discharge in liquid 液体中纳秒放电电学特性的测定

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-25 DOI: 10.1109/ICDL.2017.8124686

V. Babický, M. Člupek, P. Lukeš

引用次数: 8

Performance evaluation of dissolved gas analysis techniques against measurement errors 针对测量误差的溶解气体分析技术性能评价

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-25 DOI: 10.1109/ICDL.2017.8124631

Z. Etman, D. Mansour, Noha H. El-Amary

{"title":"Performance evaluation of dissolved gas analysis techniques against measurement errors","authors":"Z. Etman, D. Mansour, Noha H. El-Amary","doi":"10.1109/ICDL.2017.8124631","DOIUrl":"https://doi.org/10.1109/ICDL.2017.8124631","url":null,"abstract":"Fault diagnosing power transformers based on dissolved gas analysis (DGA) has become an important and a significant tool. There are a number of techniques developed for DGA that are represented extensively in literature. In practical application of DGA, there is a degree of measurement errors in obtained data. These errors are produced from inaccuracy in measurement system, environmental impact, and human errors. In the present study, it is aimed to investigate the sensitivity of different DGA techniques against measurement errors. The considered DGA techniques are IEC Ratio, Duval Triangle, and Pentagon shape. A total number of 380 actual samples were obtained from the Egyptian Electricity Network as well as published reports. Measurement errors are modeled with various levels as a percentage of original data using a random function. The three different DGA techniques are applied for error data and the corresponding diagnostic accuracy is evaluated. The techniques are compared on two stages. The first stage includes the comparison for only main faults, thermal, arcing and partial discharge. The second stage compares the diagnostic accuracy for detailed faults, such as low thermal, medium thermal, high thermal, and so on. Based on the results, the most robust technique is adopted.","PeriodicalId":439228,"journal":{"name":"2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)","volume":"394 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122853215","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

Positive streamer inception in cyclohexane: Evidence of formative time and cavitation process 环己烷中的正流光起始:形成时间和空化过程的证据

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-25 DOI: 10.1109/ICDL.2017.8124600

O. Lesaint, L. Costeanu

引用次数: 7

Streamer discharge propagation and branching characteristics in transformer oil under AC voltage: Partial discharge and light emission 交流电压下变压器油中的流光放电传播和分支特性:局部放电和发光

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) Pub Date : 2017-06-25 DOI: 10.1109/ICDL.2017.8124615

Yuan Li, Jia-ye Wen, Yu Liang, Jiang Wu, Shaorui Qin, Guanjun Zhang

引用次数: 6