2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)最新文献_第2页

Energy spectrum of vacancies and nanobubbles in condense matter: Crystal melting 凝聚态物质中空位和纳米气泡的能谱:晶体熔化

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893084

A. Khrapak, S. Khrapak

引用次数: 0

A Reason for “Corrosive Sulfur” Failures “腐蚀性硫”失效的原因

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893140

L. Arvidsson, Jan-Petter Haugli, Egil Ravnemyhr, Bjørn Tandstad

{"title":"A Reason for “Corrosive Sulfur” Failures","authors":"L. Arvidsson, Jan-Petter Haugli, Egil Ravnemyhr, Bjørn Tandstad","doi":"10.1109/ICDL.2014.6893140","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893140","url":null,"abstract":"It has long been the accepted opinion that it is the DBDS additive that causes the majority of failures in modern transformers manufactured up to 2007 when the use of this antioxidant was discontinued by most of the oil manufacturers that had chosen to use DBDS. Since long, whenever a failure occurs and the Covered Conductor Deposition test (CCD) comes out positive, DBDS is blamed. However, this enormous simplification of reality has not been accepted by all. Independent research has been carried out for the purpose of giving a less prejudice picture of the situation. With this research results, in conjunction with the in-depth failure analysis of one transformer that presented all the signs which characterize a corrosive sulfur it has become clear that corrosive sulfur failure depending on DBDS and other sulfur based additives may well be a myth. The same research also strongly indicate that Irgamet® 39 cannot possibly be a copper passivator and this is exemplified by purely logical reasoning. This paper also briefly discuss stereochemical and as far as literature searches performed by the authors never before mentioned aspect regarding why lrgamet® 39 will never function. Irgamet® 39 was used to attempt to mitigate the corrosive sulphur effect by DBDS in this transformer which failed. Stereo-chemistry, molecule reactivity and literature searches has instead shown DBDS to be a passivator in the true sense or the word.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"31 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84917933","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

Study on influence of oxidation on static electrification in transformer oil 氧化对变压器油静电影响的研究

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893109

K. Shima, M. Tsuchie, M. Kozako, M. Hikita, Y. Gosho

引用次数: 1

Space charge formation in insulating liquids under DC stresses 直流应力下绝缘液体的空间电荷形成

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893134

F. Vahidi, S. Tenbohlen, M. Rosner, C. Perrier, H. Fink

{"title":"Space charge formation in insulating liquids under DC stresses","authors":"F. Vahidi, S. Tenbohlen, M. Rosner, C. Perrier, H. Fink","doi":"10.1109/ICDL.2014.6893134","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893134","url":null,"abstract":"The occurrence of space charges has to be understood, in order to study the field distortion which is due to space charges. Hence, the investigation of space charge behavior and its origin in insulating liquids is necessary for design of optimal insulation system. It is important to know about the type of charge carriers present in insulating gap. Applying different DC stresses with various polarities can be helpful to determine the thickness of space charge regions near the electrodes and consequently, to achieve knowledge of space charge distribution both in insulating liquid and along the electrode surfaces. If an electrostatic field is applied onto the insulation between two electrodes, the charge carriers will begin to move towards the electrodes and neutralize themselves on metal electrodes. To determine the velocity of charge carriers during the measurements, a polarity reversal test is recommended which can be performed after long-duration conductivity measurements. In this investigation, the polarization current is measured using a plate-shaped test cell with stainless steel electrodes which allows a variation of gap between 1 to 5mm. In this case, the measurement set-up is based on low level current measurement with high sensitive ammeters because the current flowing through an insulation system is some pA's only. Finally, all these input parameters are used to describe the physical phenomena which occur during the conduction process.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"16 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2014-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82285004","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: 5

A new approach to monitor copper sulphide migration in paper oil insulation of transformers 一种监测变压器纸油绝缘中硫化铜迁移的新方法

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893135

Kumar A. Ravi, A. Akshatha, J.Sundara Rajan

引用次数: 1

Determination of the thermal endurance of transformer oil by structural analyses 用结构分析法测定变压器油的热耐久性

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893097

R. Polanský, P. Prosr, J. Pihera

{"title":"Determination of the thermal endurance of transformer oil by structural analyses","authors":"R. Polanský, P. Prosr, J. Pihera","doi":"10.1109/ICDL.2014.6893097","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893097","url":null,"abstract":"Determination of the thermal endurance of transformer oil Nynas Lyra X was studied. The oil was exposed to thermal treatment at temperatures of 110, 120 and 130 °C for times ranging from 100 to 2400 hours. New methods for determination of material's thermal endurance were searched. Attention was drawn to the group of structural analyses from which two methods were selected: Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC). The dissipation factor was also measured according to standard EN 60247 as a comparison test and for a determination of end-point criteria of all newly monitored observables. Infrared spectral band of low temperature inhibitor and the temperature of the first thermo-oxidative DSC peak were used for further evaluation. It has been shown that the both analysed observables are continuously changing along applied thermal treatment and hence meet essential requirements of IEC 60216 standards. End-point criteria of analysed observables were determined and Arrhenius diagrams were subsequently plotted. The proposed observables, as determined via structural analyses, provide promising alternatives to dissipation factor measurement.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"97 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":"72678348","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

Copper influence on the ultraviolet visible spectroscopy and property of oil in the ageing process of oil-paper insulation 油纸绝缘老化过程中铜对油的紫外可见光谱及性能的影响

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893131

J. Hao, Haibin Liu, Gaolin Wu, Qian Wang, Jin Fu, Q. Yao

{"title":"Copper influence on the ultraviolet visible spectroscopy and property of oil in the ageing process of oil-paper insulation","authors":"J. Hao, Haibin Liu, Gaolin Wu, Qian Wang, Jin Fu, Q. Yao","doi":"10.1109/ICDL.2014.6893131","DOIUrl":"https://doi.org/10.1109/ICDL.2014.6893131","url":null,"abstract":"The insulation paper wrapped copper winding is immersed in insulation oil to provide insulation in power transformer. The copper corrosion/dissolution in oil-paper insulation system has been attracted great attention. However, not enough data have been obtained about the copper products influence on physicochemical and electrical properties of oil in the process of oil-paper insulation ageing. In this paper, the thermal ageing experiment of four combinations of oil-paper insulation samples which were consisted of Karamay 25# naphthenic oil, Karamay 25# paraffinic oil, Kraft paper wrapped with and without copper strip at 110°C and 130°C was conducted. The oil acidity, viscosity, breakdown voltage and ultraviolet-visible (UV) spectroscopy of the insulation oils with different ageing condition were analyzed. Results show that the oil acidity increases with oil ageing. The viscosity and breakdown voltage of different oils shows fluctuation in the ageing process. The oil aged with copper has higher oil acidity than that without copper, especially in the later period of ageing. The oils aged with copper have higher UV absorption peak values. The relationship between oil acidity and the UV absorption peak for oils aged with copper is different from that aged without copper.","PeriodicalId":6523,"journal":{"name":"2014 IEEE 18th International Conference on Dielectric Liquids (ICDL)","volume":"67 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":"77188908","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

Electrical and optical-emission parallel study of natural ester liquids stressed by impulse high voltage 天然酯类液体在脉冲高压作用下的电学和光发射并行研究

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893116

G. Peppas, Panagiotis Koulis, P. Svarnas, E. Pyrgioti

引用次数: 0

Dielectric spectroscopy of binary liquid systems as prototypes for interactions in Biological systems 作为生物系统相互作用原型的二元液体系统的介电光谱

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893105

V. Madhurima, Oruganti Sravya, A. Tumuluri, K. Raju

引用次数: 1

Resonant electron attachment to oxygen impurities in dense Neon gas 致密氖气中氧杂质的共振电子附着

2014 IEEE 18th International Conference on Dielectric Liquids (ICDL) Pub Date : 2014-09-08 DOI: 10.1109/ICDL.2014.6893070

A. Borghesani

引用次数: 1