Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254862
X. Qi, Z. Zheng, S. Boggs
Development of new polymer films is impeded by the need to make large quantities of high quality film for prototype devices. However, DC breakdown should be predictable from material electrothermal properties, i.e., field and temperature dependent electrical conductivity, thermal diffusivity, and boundary conditions. Transient nonlinear finite element analysis readily predicts thermal runaway of a polymer film between metal electrodes. In this contribution, we evaluate analytical approaches to this problem in the context of laboratory testing between metal electrodes. The objective is to predict approximate limits to device performance as a function of electric field and temperature from measurements on prototype materials.
{"title":"Computation of electro-thermal breakdown of polymer films","authors":"X. Qi, Z. Zheng, S. Boggs","doi":"10.1109/CEIDP.2003.1254862","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254862","url":null,"abstract":"Development of new polymer films is impeded by the need to make large quantities of high quality film for prototype devices. However, DC breakdown should be predictable from material electrothermal properties, i.e., field and temperature dependent electrical conductivity, thermal diffusivity, and boundary conditions. Transient nonlinear finite element analysis readily predicts thermal runaway of a polymer film between metal electrodes. In this contribution, we evaluate analytical approaches to this problem in the context of laboratory testing between metal electrodes. The objective is to predict approximate limits to device performance as a function of electric field and temperature from measurements on prototype materials.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133537350","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254944
F. Vega, A.T. Perez, A. Castellanos
We study in this paper the pressure instability mechanism in an ohmic/ohmic fluid interface stressed by a vertical stationary electric field. The study is carried out by means of a simplified (hydraulic) model, which is based in a system where the destabilizing action of the electric pressure is solely equilibrated by the gravitational pressure at the interface. We focus on the analysis of the combined effect of interfacial polarization and free charges on the pressure instability mechanism.
{"title":"The combined effect of polarization and free surface charges on the electric pressure jump in an ohmic/ohmic fluid interface","authors":"F. Vega, A.T. Perez, A. Castellanos","doi":"10.1109/CEIDP.2003.1254944","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254944","url":null,"abstract":"We study in this paper the pressure instability mechanism in an ohmic/ohmic fluid interface stressed by a vertical stationary electric field. The study is carried out by means of a simplified (hydraulic) model, which is based in a system where the destabilizing action of the electric pressure is solely equilibrated by the gravitational pressure at the interface. We focus on the analysis of the combined effect of interfacial polarization and free charges on the pressure instability mechanism.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131394138","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254827
T. Hori, K. Kaneko, T. Mizutani, M. Ishioka
Charge carriers injected from the electrode and charge carriers generated in the bulk contribute space charge in low density polyethylene (LDPE). However, it is sometimes difficult to separate their contributions. In this paper, a fluorinated ethylene propylene copolymer (FEP) film was used as a blocking layer. It was effective to separate injected carriers and bulk-generated carriers. The electrode materials used were aluminum and semiconductive (SC) polymer. Charge carriers were mainly injected from the SC electrode into a specimen of Al/LDPE/SC and they formed homo space charge. A blocking FEP film suppressed the carrier injection and it gave information about the behavior of bulk-generated carriers. From these results, we discussed the contributions of injected carriers and bulk carriers to space charge in LDPE.
{"title":"Space charge distribution in low-density polyethylene with blocking layer","authors":"T. Hori, K. Kaneko, T. Mizutani, M. Ishioka","doi":"10.1109/CEIDP.2003.1254827","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254827","url":null,"abstract":"Charge carriers injected from the electrode and charge carriers generated in the bulk contribute space charge in low density polyethylene (LDPE). However, it is sometimes difficult to separate their contributions. In this paper, a fluorinated ethylene propylene copolymer (FEP) film was used as a blocking layer. It was effective to separate injected carriers and bulk-generated carriers. The electrode materials used were aluminum and semiconductive (SC) polymer. Charge carriers were mainly injected from the SC electrode into a specimen of Al/LDPE/SC and they formed homo space charge. A blocking FEP film suppressed the carrier injection and it gave information about the behavior of bulk-generated carriers. From these results, we discussed the contributions of injected carriers and bulk carriers to space charge in LDPE.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131647475","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254784
V. Griseri, K. Fukunaga, T. Maeno, C. Laurent, D. Payan, L. Levy
Materials that are covering satellites can get charge when in orbit. In any case, this charging state can lead to hazardous discharge that might cause electronic interference and result in anomalies on electronic devices. Such kind of problems motivates the studies of materials charging in vacuum chamber where space environment is reproduced. Pulse Electro-Acoustic (PEA) system has been recently developed to perform measurements of space charge in-situ during materials electronic irradiation. A specific configuration has been adopted for the measuring electrodes with the consequences of a possible loose contact between the sample and the acoustic sensor. Solutions have to be found to overcome this problem. A series of assessments regarding the contact between the sample and the detection electrode has been performed in the air by using different glues and several types of polymeric films (PolyMethylMetAcrylate, Polyimide Kapton/spl reg/, PolyFluoroEthylene Teflon/spl reg/, PolyStyrene...). A survey of the best combinations is given.
{"title":"Assessment of measuring conditions with the pulse electro-acoustic system adapted to work under electronic irradiation","authors":"V. Griseri, K. Fukunaga, T. Maeno, C. Laurent, D. Payan, L. Levy","doi":"10.1109/CEIDP.2003.1254784","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254784","url":null,"abstract":"Materials that are covering satellites can get charge when in orbit. In any case, this charging state can lead to hazardous discharge that might cause electronic interference and result in anomalies on electronic devices. Such kind of problems motivates the studies of materials charging in vacuum chamber where space environment is reproduced. Pulse Electro-Acoustic (PEA) system has been recently developed to perform measurements of space charge in-situ during materials electronic irradiation. A specific configuration has been adopted for the measuring electrodes with the consequences of a possible loose contact between the sample and the acoustic sensor. Solutions have to be found to overcome this problem. A series of assessments regarding the contact between the sample and the detection electrode has been performed in the air by using different glues and several types of polymeric films (PolyMethylMetAcrylate, Polyimide Kapton/spl reg/, PolyFluoroEthylene Teflon/spl reg/, PolyStyrene...). A survey of the best combinations is given.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131658052","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254854
G. Gurumurthy
Several theoretical investigations have been reported in literature on electric field nonuniformity between point plane electrodes. In the present investigations experiments have been performed to determine corona onset voltages in air at atmospheric pressure between point plane electrodes for DC voltage applications of both polarities. The diameter of hemispherical tip of point electrodes used in experiments varied from 1.2 mm to 3.0 mm and gap distances varied from 20 mm to 50 mm (approximately). For these electrode arrangements, calculated variation of electrical field non uniformity factor was from 18 to 48. The measured corona inception voltages were found to increase with increase in diameter of point electrodes and also with increase in gap distance between electrodes. The calculated maximum stresses at tip of point electrode at corona inception are in approximate range of 70kv/cm to 135 kv/cm. The maximum stress, which appears for tip diameter of 1.2 mm for point electrode, does not significantly influence the field variation in these gaps as to disturb Townsend mechanism of ionization growth.
{"title":"Corona between point plane electrodes in air at atmospheric pressure","authors":"G. Gurumurthy","doi":"10.1109/CEIDP.2003.1254854","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254854","url":null,"abstract":"Several theoretical investigations have been reported in literature on electric field nonuniformity between point plane electrodes. In the present investigations experiments have been performed to determine corona onset voltages in air at atmospheric pressure between point plane electrodes for DC voltage applications of both polarities. The diameter of hemispherical tip of point electrodes used in experiments varied from 1.2 mm to 3.0 mm and gap distances varied from 20 mm to 50 mm (approximately). For these electrode arrangements, calculated variation of electrical field non uniformity factor was from 18 to 48. The measured corona inception voltages were found to increase with increase in diameter of point electrodes and also with increase in gap distance between electrodes. The calculated maximum stresses at tip of point electrode at corona inception are in approximate range of 70kv/cm to 135 kv/cm. The maximum stress, which appears for tip diameter of 1.2 mm for point electrode, does not significantly influence the field variation in these gaps as to disturb Townsend mechanism of ionization growth.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123864596","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254795
M. Hemmer, R. Badent, T. Leibfried
This paper deals with investigations on usability of commercially available bio-oils as insulating liquid. The bio-oils investigated are those that are "in general not hazardous to water" according to German General Administrative Regulation on the Classification of Substances Hazardous to Waters. The oils tested by us meeting this criteria are predominantly biodegradable hydraulic fluids of low viscosity. Besides the ecological advantages, these oils have. excel lent resistance to ageing, sound fluidity, low pour point and high flash point. In order to explore possible field of application of bio-oils as insulating material, dielectric tests according to IEC 156 and IEC 247 have been carried out. Tests included measurement of AC breakdown strength as well as dielectric dissipation factor tan /spl delta/, permittivity /spl epsiv//sub r/ and specific DC resistance /spl rho/. Obtained results are compared to the electrical properties of inhibited rape-seed oil RAPSOL T, which is suitable as transformer oil substitute based on our earlier reported investigations. This work has led to identification of a commercially available bio-oil whose electrical characteristics are equal or even better than that of RAPSOL T.
{"title":"Investigation of the suitability of commercially available bio-oils as insulating liquid","authors":"M. Hemmer, R. Badent, T. Leibfried","doi":"10.1109/CEIDP.2003.1254795","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254795","url":null,"abstract":"This paper deals with investigations on usability of commercially available bio-oils as insulating liquid. The bio-oils investigated are those that are \"in general not hazardous to water\" according to German General Administrative Regulation on the Classification of Substances Hazardous to Waters. The oils tested by us meeting this criteria are predominantly biodegradable hydraulic fluids of low viscosity. Besides the ecological advantages, these oils have. excel lent resistance to ageing, sound fluidity, low pour point and high flash point. In order to explore possible field of application of bio-oils as insulating material, dielectric tests according to IEC 156 and IEC 247 have been carried out. Tests included measurement of AC breakdown strength as well as dielectric dissipation factor tan /spl delta/, permittivity /spl epsiv//sub r/ and specific DC resistance /spl rho/. Obtained results are compared to the electrical properties of inhibited rape-seed oil RAPSOL T, which is suitable as transformer oil substitute based on our earlier reported investigations. This work has led to identification of a commercially available bio-oil whose electrical characteristics are equal or even better than that of RAPSOL T.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124456811","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254836
Yuanxiang Zhou, Baile Zhang, P. Yan, Ninghua Wang, Yinan Wang, Xidong Liang, Z. Guan
In this paper, a needle-plane electrode system and non woven polypropylene filters were used to study the space charge formation on the surface of dielectrics by nanosecond pulse discharge. Ordinarily, the charging of polymers shows the same polarity as the voltage applied. A novel discovery of polarity reversal discharge was found that the accumulated space charges on the surface of polymers show a different polarity against the applied pulse. It was found that a higher positive pulse peak leads to easier polarity reversal charge accumulation in polymers. It was also found that a negative pulse causes a positive charge accumulation when the peak is sufficient high and the pulse width is sufficient small. In addition, a negative pulse will produce the same polarity of charges on the surface of polymers when the width of pulse is larger than 200 ns. A novel mechanism of two charging processes of high fluid injection and return stroke injection has been put forward here to fit the polarity reversal charging phenomena. We concluded that the polarity reversal charging of polymers can be inherently related to the discharge in gases and the needle-plane electrode system.
{"title":"Polarity reversal discharge on polypropylene surface applied with nanosecond pulses","authors":"Yuanxiang Zhou, Baile Zhang, P. Yan, Ninghua Wang, Yinan Wang, Xidong Liang, Z. Guan","doi":"10.1109/CEIDP.2003.1254836","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254836","url":null,"abstract":"In this paper, a needle-plane electrode system and non woven polypropylene filters were used to study the space charge formation on the surface of dielectrics by nanosecond pulse discharge. Ordinarily, the charging of polymers shows the same polarity as the voltage applied. A novel discovery of polarity reversal discharge was found that the accumulated space charges on the surface of polymers show a different polarity against the applied pulse. It was found that a higher positive pulse peak leads to easier polarity reversal charge accumulation in polymers. It was also found that a negative pulse causes a positive charge accumulation when the peak is sufficient high and the pulse width is sufficient small. In addition, a negative pulse will produce the same polarity of charges on the surface of polymers when the width of pulse is larger than 200 ns. A novel mechanism of two charging processes of high fluid injection and return stroke injection has been put forward here to fit the polarity reversal charging phenomena. We concluded that the polarity reversal charging of polymers can be inherently related to the discharge in gases and the needle-plane electrode system.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123822365","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254891
P. Calva, V. del Moral, M.G. Marquez, G.P. Cabrera
The IEC-60-1989 and IEEE Std. 4-1995 procedures for dc voltages are not suitable for high altitudes. The assumption that the streamer propagation field varies linearly with the relative air density does not apply to high-altitude dc breakdown. Recently it has been published some work related to the positive polarity, in this paper, finally, considering both positive and negative polarities a new proposal of correction factors for dc voltages is presented. It has been concluded that the effect of air density and humidity can be accounted for independently, that in positive polarity it is necessary to correct both for relative air density and for humidity, but in negative polarity only by relative air density, furthermore, a gap factor for different arrangements of electrodes is introduced.
{"title":"New proposal of correction factors for dc voltages","authors":"P. Calva, V. del Moral, M.G. Marquez, G.P. Cabrera","doi":"10.1109/CEIDP.2003.1254891","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254891","url":null,"abstract":"The IEC-60-1989 and IEEE Std. 4-1995 procedures for dc voltages are not suitable for high altitudes. The assumption that the streamer propagation field varies linearly with the relative air density does not apply to high-altitude dc breakdown. Recently it has been published some work related to the positive polarity, in this paper, finally, considering both positive and negative polarities a new proposal of correction factors for dc voltages is presented. It has been concluded that the effect of air density and humidity can be accounted for independently, that in positive polarity it is necessary to correct both for relative air density and for humidity, but in negative polarity only by relative air density, furthermore, a gap factor for different arrangements of electrodes is introduced.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125108427","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254805
S. Venkataraman, R. Gorur, R. Bass, C. Rhodes
Polymeric materials are used as liners in pipelines in the oil industry. In some applications, they are subjected to electrical stress in a high-pressure gaseous medium that can have little or no free oxygen. Contact with liquid contamination is a distinct possibility. In order to understand the behavior of polymeric materials under such conditions, a series of laboratory tests were performed using the ASTM - D 2303 Inclined Plane (UP) testing arrangement. Testing was performed under ambient as well as high-pressure conditions produced by nitrogen and methane. The results indicate that the tracking and erosion resistance of materials obtained under ambient conditions can be significantly different from, those obtained in oxygen deficient high-pressure media.
在石油工业中，聚合物材料被用作管道的衬垫。在某些应用中，它们在高压气体介质中承受电应力，这种介质可能只有很少或没有自由氧。很有可能接触到液体污染。为了了解聚合物材料在这种条件下的行为，使用ASTM - D 2303斜面(UP)测试装置进行了一系列实验室测试。测试在由氮气和甲烷产生的环境和高压条件下进行。结果表明，在常温条件下获得的材料与在缺氧高压介质中获得的材料相比，其跟踪性和抗冲蚀性有显著差异。
{"title":"Arc tracking resistance of polymeric materials in oxygen deficient conditions","authors":"S. Venkataraman, R. Gorur, R. Bass, C. Rhodes","doi":"10.1109/CEIDP.2003.1254805","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254805","url":null,"abstract":"Polymeric materials are used as liners in pipelines in the oil industry. In some applications, they are subjected to electrical stress in a high-pressure gaseous medium that can have little or no free oxygen. Contact with liquid contamination is a distinct possibility. In order to understand the behavior of polymeric materials under such conditions, a series of laboratory tests were performed using the ASTM - D 2303 Inclined Plane (UP) testing arrangement. Testing was performed under ambient as well as high-pressure conditions produced by nitrogen and methane. The results indicate that the tracking and erosion resistance of materials obtained under ambient conditions can be significantly different from, those obtained in oxygen deficient high-pressure media.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124699582","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}
Pub Date : 2003-10-19DOI: 10.1109/CEIDP.2003.1254937
S. M. Lebedev, E. Gockenbach
The experimental results of study of the tree-inception time (/spl tau//sub i/) in the divergent field for the three-layer dielectrics are presented in this paper. It is shown that the tree-inception time may be essential increased due to the application of dielectric barriers with high permittivity. It is determined that the tree-inception time depends on the barrier position in the insulating gap and it has a maximum at the optimal barrier position. In doing so, the tree-inception length (l/sub i/) has a minimum value at this barrier position. Good agreement between the coefficient of the local field nonuniformity and the tree-inception time or the tree-inception length was found.
{"title":"Tree-inception in the three-layer dielectrics","authors":"S. M. Lebedev, E. Gockenbach","doi":"10.1109/CEIDP.2003.1254937","DOIUrl":"https://doi.org/10.1109/CEIDP.2003.1254937","url":null,"abstract":"The experimental results of study of the tree-inception time (/spl tau//sub i/) in the divergent field for the three-layer dielectrics are presented in this paper. It is shown that the tree-inception time may be essential increased due to the application of dielectric barriers with high permittivity. It is determined that the tree-inception time depends on the barrier position in the insulating gap and it has a maximum at the optimal barrier position. In doing so, the tree-inception length (l/sub i/) has a minimum value at this barrier position. Good agreement between the coefficient of the local field nonuniformity and the tree-inception time or the tree-inception length was found.","PeriodicalId":306575,"journal":{"name":"2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127279684","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：