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1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)最新文献

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Electrical tree structures generated by the ab-initio discharge-avalanche model 由从头算放电雪崩模型生成的电树结构
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807878
L. Dissado, N. Wise, J. Fothergill
{"title":"Electrical tree structures generated by the ab-initio discharge-avalanche model","authors":"L. Dissado, N. Wise, J. Fothergill","doi":"10.1109/CEIDP.1999.807878","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807878","url":null,"abstract":"Initially the discharge-avalanche model for electrical tree formation treated the local Poisson fields as being derived from the applied Laplace field via a modification factor that was regarded as a random variable in time and space. Recently we have removed this approximation by calculating the local Poisson fields from the space charge arrangement produced by discharges in the tree tubules and avalanches in the surrounding polymer. This \"ab-initio\" version of the model has now been fully implemented. The ac-cycle is divided into 16 time segments. In each time segment tube-discharges are allowed to occur if the potential difference along a tube is greater than an onset threshold. Positive space charge is regarded as being deposited on the tube walls in the form of positive ions. Negative charge is allowed to penetrate the polymer where it can be used to initiate avalanches and thereby generate damage. The avalanches compete with a field dependant mobility in rearranging the charge around the tree tips.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115792260","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
Fundamental study of EHD pump with needle-cylinder electrodes 针筒电极EHD泵的基础研究
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807922
K. Asano, K. Yatsuzuka
{"title":"Fundamental study of EHD pump with needle-cylinder electrodes","authors":"K. Asano, K. Yatsuzuka","doi":"10.1109/CEIDP.1999.807922","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807922","url":null,"abstract":"Since the recent CPU and the hard disks produce a large amount of heat, a quiet cooling system for such a device is required. There have been some attempts to make the system with micro machined EHD pumps by using polar liquids. Our attempt is to use a non-polar liquid as a working fluid in EHD pumping. The experimental apparatus consists of an ion injector with needle electrodes and a collecting electrode. In order to measure the pressure difference, U-shape configuration is adopted in which silicone fluid of 50 cSt is filled. From the experimental data, many interesting results were obtained. There is no pressure creation with positive polarity, contrary to negative polarity. Although the number of needle electrodes is important, there seems to exist a suitable number. The dependency of voltage is likely to follow the square law. Since the important factor for EHD pumping is fluid flow pattern, the design of electrodes is extremely important.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124119916","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
Space charge distribution measured with short period interval up to electrical breakdown in polyethylene 短时间间隔测量聚乙烯电击穿前的空间电荷分布
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807885
S. Mitsumoto, K. Tanaka, Y. Muramoto, M. Nagao, N. Hozumi, M. Fukuma
{"title":"Space charge distribution measured with short period interval up to electrical breakdown in polyethylene","authors":"S. Mitsumoto, K. Tanaka, Y. Muramoto, M. Nagao, N. Hozumi, M. Fukuma","doi":"10.1109/CEIDP.1999.807885","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807885","url":null,"abstract":"The paper describes the space charge behavior measured with short period interval up to electrical breakdown in polyethylene film. Positive space charge was formed from the anode near the opposite electrode within 1.2 seconds after voltage application of 30 kV in a HDPE film. Up to electrical breakdown, this positive space charge formulation did not change. From this result, it is considered that there is the possibility that electrical breakdown in HDPE film is caused by hetero space charge, which enhances the cathode field just before electrical breakdown. The amount of homo space charge accumulation near both electrodes increased with time of voltage application in the LDPE film. Space charge distribution was remarkably changed with time. Electrical breakdown occurred when the negative space charge layer reached the cathode after hetero space charge was formed in the bulk. There is a possibility that hetero space charge formation may be a pre-breakdown phenomena in LDPE films.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114441225","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: 8
A study of the method for evaluating dielectric materials using space charge measurement 用空间电荷测量评价介电材料的方法研究
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.804619
T. Takeda, N. Hozumi, H. Suzuki, T. Okamoto
{"title":"A study of the method for evaluating dielectric materials using space charge measurement","authors":"T. Takeda, N. Hozumi, H. Suzuki, T. Okamoto","doi":"10.1109/CEIDP.1999.804619","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.804619","url":null,"abstract":"This report deals with a study of the method for evaluating DC performance of dielectric materials using space charge and DC leakage current measurement. Two types of sheet specimens were prepared for space charge measurement, that is, simple specimens and sandwiched specimens. The simple specimens gave some information on space charge behavior. On the other hand, the sandwiched specimen made it easy to compare properties of two materials on space charge. Film specimens were used for dc leakage current measurement. Insulating materials may be evaluated in view of space charge behavior using this method.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114528170","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
Compressometer based method for measuring converse electrostriction in polymers 基于压缩计的聚合物反电伸缩测量方法
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.804657
R. Yimnirun, S. Eury, V. Sundar, P. Moses, R. Newnham
{"title":"Compressometer based method for measuring converse electrostriction in polymers","authors":"R. Yimnirun, S. Eury, V. Sundar, P. Moses, R. Newnham","doi":"10.1109/CEIDP.1999.804657","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.804657","url":null,"abstract":"Electrostriction is the fundamental mechanism of electromechanical coupling in all insulator materials. In this work, the electrostrictive coefficients of several polymers were measured by a converse method. A modified compressometer for resolving fractional changes in capacitance of the order of 10/sup -6/ was used. A highly sensitivity capacitance bridge GenRad 1615 was coupled with a lock-in amplifier to detect attofarad (10/sup -18/) level capacitance changes caused by cyclic uniaxial stresses on samples. Measurements were done at room temperature with an electrical frequency of 1 kHz and a mechanical frequency of 0.4 Hz. We found negative electrostriction coefficients for the polymers tested. The influences of crystallinity, glass reinforcement, and blending were observed to affect the electrostriction behavior due to the fact that electrostriction is mainly governed by the elastic properties in low-permittivity polymers. Using these recent data, along with widely accepted data on ferroelectric materials and soft polymers, the linear relationship between electrostriction coefficient (Q) and the ratio of elastic compliance and dielectric permittivity (s//spl epsiv//sub 0//spl rho//sub r/) was confirmed. This leads to an effective way to predict the electrostriction coefficient in dielectric materials.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129406188","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
Analytical solution and scaled model of a unipolar HVDC transmission line 单极直流输电线路解析解及比例模型
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.804611
Xin Li, M. Raghuveer, I. Ciric
{"title":"Analytical solution and scaled model of a unipolar HVDC transmission line","authors":"Xin Li, M. Raghuveer, I. Ciric","doi":"10.1109/CEIDP.1999.804611","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.804611","url":null,"abstract":"Existing analytical solutions for the ionized field of a unipolar HVDC transmission line are reviewed. The analytical relations indicate that the corona current is directly proportional to the square of the corona onset field strength if the ratio of the applied voltage to the corona onset value and that of the conductor height to its radius remain fixed. This is confirmed by numerical results. It is pointed out that this observation makes it possible to derive the basis of a scaled model to evaluate the corona current and hence the resulting power loss of a full-scale unipolar DC line.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128442129","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
Comparison between Lewis and Crine models for the electrical aging of dielectric polymers 介电聚合物电老化的Lewis和Crine模型比较
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807847
J. Crine
{"title":"Comparison between Lewis and Crine models for the electrical aging of dielectric polymers","authors":"J. Crine","doi":"10.1109/CEIDP.1999.807847","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807847","url":null,"abstract":"The electrical aging model of Lewis is compared with the modified version of Crine model. Both rely on thermodynamic and both associate the onset of aging with submicrocavity formation. The major differences in the two models are discussed in light of electrical aging data for XLPE cables. Although both models give a good fit to experimental data, Lewis model involves much more parameters and some of them are not readily accessible. On the other hand, Crine revised model depends on the cohesion energy of the polymer, on the activation energy and on the volume activation of the process. The physical significance of these parameters for the accelerated aging of polymers (especially those used in extruded cables) is also discussed.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131946188","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: 8
Sea salts contamination pattern on high voltage insulators in Littoral region of Peninsular Malaysia 马来西亚半岛沿岸地区高压绝缘子上的海盐污染模式
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807894
A.S. Ahmad, H. Ahmad, A. Salam
{"title":"Sea salts contamination pattern on high voltage insulators in Littoral region of Peninsular Malaysia","authors":"A.S. Ahmad, H. Ahmad, A. Salam","doi":"10.1109/CEIDP.1999.807894","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807894","url":null,"abstract":"This paper describes series results of experiments conducted at Paka Thermal Power Station, which is located near the East Coast of Peninsular Malaysia. More than 12 samples of typical cap-and-pin glass insulators that are commonly installed on electrical power transmission lines are used in the experimentation. Three types of insulator topology are employed, single units, suspension-type and tension-type. These un-energized insulators are allowed to be exposed to 3-4 months duration of sea salts contamination. Equivalent salt deposit density (ESDD) measurement is conducted to measure insulator's contamination level. It was found that salt accumulation on suspension type insulator is much heavier than the tension type. Also the direction of inward coming winds has some influence on the salt deposition to the insulator surfaces. Experiments showed that ESDD increases linearly with an increase in time of exposure. This work will help in the establishment of maintenance policies especially in the months of monsoon when generally many utilities thought that during these months maintenance of insulators is not necessary.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"225 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132182678","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
Identification of LMW fluid in HTV silicone rubber HTV硅橡胶中LMW流体的鉴定
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807911
Hui Zhang, R. Hackam, V. Lazarescu
{"title":"Identification of LMW fluid in HTV silicone rubber","authors":"Hui Zhang, R. Hackam, V. Lazarescu","doi":"10.1109/CEIDP.1999.807911","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807911","url":null,"abstract":"In the present paper, the loss and the regeneration of LMW silicone fluid in HTV silicone rubber are investigated in a simulated aging environment at different elevated temperatures. The LMW fluid was extracted at each stage of aging and the amount of regenerated fluid was measured. The molecular distribution of dimethylsiloxane in the LMW fluid was identified using gas chromatography-mass spectrometry.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130245508","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
The influence of BTA on the electrical properties of synthetic fluids BTA对合成流体电性能的影响
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI: 10.1109/CEIDP.1999.807836
Nungpyo Hong, Jong-Pil Lee, J. Shin, H. Shin, Soo-Won Lee, Jin-woong Hong
{"title":"The influence of BTA on the electrical properties of synthetic fluids","authors":"Nungpyo Hong, Jong-Pil Lee, J. Shin, H. Shin, Soo-Won Lee, Jin-woong Hong","doi":"10.1109/CEIDP.1999.807836","DOIUrl":"https://doi.org/10.1109/CEIDP.1999.807836","url":null,"abstract":"Synthetic fluids of class 7 group 2, as an insulating and cooling material are selected as specimens, and it is studied for the physical properties. Also, benzotriazole (BTA) known as suppressant of streaming electrification is added to specimen, and the change of physical and electrical properties by addition of BTA is investigation. From the spectrum of FT-IR, it is confirmed that the absorption peak in wavenumbers 3400/spl sim/3450[cm/sup -1/] is small or disappears when BTA is added. AC breakdown strength and volume resistivity of each specimen are investigated. It is considered that the optimum content of BTA is about 10[ppm] for the suppression of electrification in this experiment.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125406712","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
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