2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)最新文献_第4页

Comparison of streamers characteristics in jatropha curcas methyl ester oil and mineral oil under lightning impulse voltage 麻疯树甲酯油与矿物油在雷击电压下的飘带特性比较

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893090

H. B. H. Sitorus, A. Beroual, R. Setiabudy, S. Bismo

{"title":"Comparison of streamers characteristics in jatropha curcas methyl ester oil and mineral oil under lightning impulse voltage","authors":"H. B. H. Sitorus, A. Beroual, R. Setiabudy, S. Bismo","doi":"10.1109/ICDL.2014.6893090","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893090","url":null,"abstract":"Due to their high biodegradability, non-toxicity and fire safety guarantee, vegetable-based oils are considered today as a potential substitute for mineral and synthetic liquids for electrical insulation and especially in high voltage power transformers. However, most of known vegetable oils are derived from food materials (rape-seeds, sunflower, soybeans, palms, corns and others). And one has to be vigilant to the fact that the replacement of mineral oil by natural ester fluids based on “renewably sourced” vegetable oils, does not create new problems as this could cause global food crisis due to diversion of food into insulating material oils or others (fuel). An interesting product can be jatropha curcas oil extracted from the fruits of jatropha curcas plants (“miracle tree”) which is non-food crops. These plants can be grown on marginal or degraded soils (thus avoiding the need to utilize those more fertile soils currently being used by smallholders to grow their staple crops); and it will readily grow in areas where annual rainfall levels are significantly lower than those required by other species such as rape-seeds, sunflower, palm, soybeans, corns and others. This paper presents an experimental study of streamers phenomena in jatropha curcas methyl ester oil (JMEO) and mineral oil (MO) under positive and negative lightning impulse voltages (1.2/50 μs). It is shown that basing on the shape and stopping length of streamers, JMEO could constitute a potential substitute for mineral and synthetic oils for electrical insulation and especially in high voltage power transformers.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"33 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78128903","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: 13

Study of charge injection phenomenon at the metal/insulating liquid interfaces 金属/绝缘液体界面电荷注入现象的研究

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893139

A. Beldjilali, Z. Laimeche, Amroun N. Saidi, H. Moulai, M. Saidi

{"title":"Study of charge injection phenomenon at the metal/insulating liquid interfaces","authors":"A. Beldjilali, Z. Laimeche, Amroun N. Saidi, H. Moulai, M. Saidi","doi":"10.1109/ICDL.2014.6893139","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893139","url":null,"abstract":"The goal of this paper is to study the transport phenomena occurring in mineral oils used as power transformers insulation. The main issue is to understand and predict the insulation behavior under different operating conditions. It is known that conduction phenomenon is explained through ionic carriers provided by dissociation phenomenon in the bulk of the insulating liquid when it is submitted to high voltage, but the problem is more complex at the metal/insulating liquid interfaces. For example, formation of the multilayer regions of space charge near the electrodes affects strongly the transport phenomenon, charge carriers injection from the metal into the dielectric liquid may be also possible. Using the isothermal charging currents measurements, the aim of the work is to study different metal/insulating liquid interfaces. We have associated various kinds of metallic electrodes (stainless steel, aluminium and brass) with the Borak22 mineral oil. The metal/liquid/metal structures were submitted to a DC voltage and the electrical charging current was measured with high sensitive electrometer. The results show clearly the effect of the barrier injection high for the three interfaces under high or low applied electric fields. Under high ones, this means that in spite of the formation of the Helmholtz and the diffusive layers, the injection phenomenon still exists but measurements under low applied fields allow announcing that charge carriers are injected at metal/insulating liquid interface according to the schottky low, so the electronic conduction remain possible.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"2 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75294932","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

Absorption of water in silicon gel 在硅胶中吸收水分

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893159

C. Lesaint, Celine Babault, K. Liland, L. Lundgaard

{"title":"Absorption of water in silicon gel","authors":"C. Lesaint, Celine Babault, K. Liland, L. Lundgaard","doi":"10.1109/ICDL.2014.6893159","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893159","url":null,"abstract":"Water is an important enemy of an electric insulation system. Water vapour can be absorbed by electrical insulation materials (liquids or solid) and migrate in between the materials to achieve the same relative humidity equilibrium everywhere. Water can reduce withstand voltage of the insulation liquid, initiate partial discharges in wet solids and increase dielectric losses in solids like epoxies, gels, PCB cards and produce dielectric heating. In insulation liquid filled system the water content of the liquid should never be allowed to reach saturation. One failure scenario is when typical oil with significant water content is cooled to a temperature where the water content is above the saturation content, and then water will precipitate and may condensate at cold insulating gaps and give breakdown due to electric field enhancement. Gel samples were investigated in climate chambers in various conditions of humidity and temperature until an equilibrium was reached. Diffusion and absorption of water were measured at different intervals. The aim of the study was to find an appropriate technique/methodology to follow the absorption of moisture in gel as a function of time. Several techniques were tested to determine the moisture content in the gel such as Karl Fischer, weight differences measurement, freeze drying and capacitive relative humidity sensors giving contrasted results. The weight difference method showed “anomaly” indicating bound water, even after equilibrium (measured with the other methods) was reached the weight continued to increase. The use of humidity sensors covered by gel appears to be the most reliable technique.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"3 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91372082","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

Simulation of the electrical conduction of cyclohexane with TiO2 nanoparticles TiO2纳米颗粒对环己烷导电性能的模拟

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893119

M. Aljure, M. Becerra, B. Jonsson

引用次数: 1

Investigation of the influence of boiling point shifting on the breakdown voltage in liquid nitrogen 沸点变化对液氮击穿电压影响的研究

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893117

N. Hill, M. Blaz, M. Kurrat

引用次数: 3

Electro-hydrodynamic spraying of soybean oil 大豆油的电液喷涂

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893072

S. Barringer, D. P. Aykas

引用次数: 0

Characteristics of partial discharge in the oil gap separated by pressboard barrier in oil/pressboard composite insulation system 油/纸板复合绝缘系统中隔油隙局部放电特性

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893106

T. Umemoto, S. Kainaga, H. Muto, T. Tsurimoto, S. Yoshida, M. Kozako, M. Hikita

引用次数: 5

Degradation process of silicone-gel by internal surface discharges 内表面放电降解硅胶的研究

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893095

Masahiro Sato, A. Kumada, K. Hidaka, K. Yamashiro, Y. Hayase, T. Takano

引用次数: 13

Enhancement of phenol degradation in aqueous solution by a hollow screw like electrode in gas-liquid DBD 空心螺杆电极增强气液DBD对水溶液中苯酚的降解

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893168

A. Mercado-Cabrera, R. López-Callejas, R. Peña-Eguiluz, R. Valencia-Alvarado, B. Rodríguez-Méndez, A. Munoz-Castro, B. Jaramillo-Sierra, A. de la Piedad-Beneitez

{"title":"Enhancement of phenol degradation in aqueous solution by a hollow screw like electrode in gas-liquid DBD","authors":"A. Mercado-Cabrera, R. López-Callejas, R. Peña-Eguiluz, R. Valencia-Alvarado, B. Rodríguez-Méndez, A. Munoz-Castro, B. Jaramillo-Sierra, A. de la Piedad-Beneitez","doi":"10.1109/ICDL.2014.6893168","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893168","url":null,"abstract":"Nonthermal plasma process of dielectric barrier discharge was successfully applied to experimental phenol degradation in a synthetic waste water aqueous solution. A typical coaxial reactor was disposed vertically but the surface of the high voltage internal electrode was shaped like a hollow screw. This electrode allowed to have a quasi-homogeneous plasma in all the length of the reactor and the inter-electrode space. With this configuration was possible to decrease the typical consumed electric power by the reactor and the liquid temperature at the end of the experience. A 90%Ar-10%O2, 80%Ar-20%O2 or 100%O2 gas mixture flowed across the gas gap and on the liquid surface. The applied electric power was in the range of 18-23 kV at 1.5 kHz. A 100%O2 gas mixture, experimental results showed an enhancement of removal efficiency beyond of 99% compared with a smooth surface cylindrical electrode after 1 hour of treatment. Also, this high efficiency was obtained with lower released power compared with that of smooth surface cylindrical electrode.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"63 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77437484","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

Measurements of the charge of streamers propagating along transformer oil-solid interfaces 沿变压器油-固界面传播的流光电荷的测量

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893165

D. Ariza, M. Becerra, R. Hollertz, C. Pitois

引用次数: 2