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IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena最新文献

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PD data base for stator insulation of turbogenerators 汽轮发电机定子绝缘局部放电数据库
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641132
E. Gulski, J. Zondervan, A. Zielonka, R. Brooks
{"title":"PD data base for stator insulation of turbogenerators","authors":"E. Gulski, J. Zondervan, A. Zielonka, R. Brooks","doi":"10.1109/CEIDP.1997.641132","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641132","url":null,"abstract":"This paper discusses results of PD patterns analysis of the stator insulation in different turbogenerators. Based on these measurements a PD database has been developed to support the discharge evaluation during periodic off-line inspections of turbogenerators. Using this technique clear distinction is possible between generators in good condition and these which are showing internal or external discharges originating from the insulation degradation.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128389424","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
Dielectrometry measurements of effects of moisture and anti-static additive on transformer board 湿度和抗静电添加剂对变压器板影响的介电测量
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.634600
Y. Du, M. Zahn, B. Lesieutre
{"title":"Dielectrometry measurements of effects of moisture and anti-static additive on transformer board","authors":"Y. Du, M. Zahn, B. Lesieutre","doi":"10.1109/CEIDP.1997.634600","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634600","url":null,"abstract":"Moisture in solid insulation has detrimental effects on transformer life. When the system is not in equilibrium laboratory measurements with multiple wavelength interdigital sensors using the imposed frequency-wavenumber (/spl omega/-k) dielectrometry technique have proved to be an effective way to measure complex permittivity distribution in solid insulation which is directly related to the moisture distribution. Measurements of oil-free and oil-impregnated pressboard using interdigital sensors with changes in ambient moisture concentration are presented. A comparison between existing moisture equilibrium curves for the oil-paper system and experimental results is given. Measurements are also performed for anti-static additive in oil and the dielectrometry effects are discussed.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129312175","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: 17
Viscosity effect on the dynamics of small bubbles generated by electrical current pulse in viscous insulating liquids 粘性绝缘液体中电流脉冲对小气泡动力学的影响
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641159
F. Jomni, A. Denat
{"title":"Viscosity effect on the dynamics of small bubbles generated by electrical current pulse in viscous insulating liquids","authors":"F. Jomni, A. Denat","doi":"10.1109/CEIDP.1997.641159","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641159","url":null,"abstract":"The dynamics of microscopic bubbles have been widely studied in low-viscosity insulating liquids. The bubble motion (growth, collapse, rebound, etc) is governed by inertial forces. In this paper, we analyse the bubble dynamics in viscous liquids (/spl mu//spl ges/3 10/sup -3/P a.s) and conclude that the effect of viscosity controls its dynamics. The implosion time of the bubble becomes more important than those obtained in slightly viscous liquids. Experimentally, we demonstrate the transition of dynamics bubble from the viscous regime to the inertial regime. This transition depends on the initial size of the bubble.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"30 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130679203","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
Characterization of the trapping of charges in polystyrene 聚苯乙烯中电荷俘获的表征
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.634570
J. Bigarré, S. Fayeulle, O. Paulhe, D. Tréheux
{"title":"Characterization of the trapping of charges in polystyrene","authors":"J. Bigarré, S. Fayeulle, O. Paulhe, D. Tréheux","doi":"10.1109/CEIDP.1997.634570","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634570","url":null,"abstract":"Nowadays, many works are done to study phenomena occuring after the charges build up leading to breakdown. But few of them describe the behavior of insulator during electrons injection. In our work, abrupt electron ejections during and after the electron injection in polystyrene have been detected using a SEM by recording simultaneously the secondary electron emission current and the absorbed current. The observed ejection are explained by the reach of a critical field.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124512971","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: 11
Loss of hydrophobicity of high density polyethylene 高密度聚乙烯疏水性的丧失
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641090
M. Khan, R. Hackam
{"title":"Loss of hydrophobicity of high density polyethylene","authors":"M. Khan, R. Hackam","doi":"10.1109/CEIDP.1997.641090","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641090","url":null,"abstract":"This study reports on the loss of hydrophobicity of high density polyethylene (HDPE) after immersion in a saline solution. The conductivity of the solution was varied from 5 to 10/sup 5/ /spl mu/S/cm and its temperature from 23 to 73/spl deg/C. The contact angle of a droplet of water on the polymer surface which gives a measure of the hydrophobicity was determined. The influence of applying either a radio frequency (RF) discharges or a high voltage dc stress on the loss and the recovery of the hydrophobicity was investigated. It is found that the contact angle decreased with increasing salinity level and increasing temperature of the solution. The time which it took for the surface energy and therefore, the hydrophobicity to drop depended on the combined stresses of salinity and heat. The contact angle decreased substantially after subjecting the surface to RF discharges and subsequently recovered very slowly after the removal of the stress. The increase in the weight and the surface roughness of the specimens due to absorption of the saline solution were also measured and correlated to the changes in the contact angle and thus to the hydrophobic property of the surface.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115842195","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: 17
Space charge in HVDC cable insulation 高压直流电缆绝缘中的空间电荷
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.634551
P. Morshuis, M. Jeroense
{"title":"Space charge in HVDC cable insulation","authors":"P. Morshuis, M. Jeroense","doi":"10.1109/CEIDP.1997.634551","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634551","url":null,"abstract":"High voltage cables that are used for DC transmission are subjected to a range of operating conditions. The resulting distribution of the electric field inside the cable is highly dependent on, for instance loading of the cable and polarity reversals. This is because the conductivity of the insulation is dependent both on the temperature and on the electric field. An essential parameter in the process to determine the internal electric field is space charge. For a thorough understanding of the behavior of the cable, knowledge of the location and amount of space charge under different operating conditions is paramount.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130433542","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: 20
Electrical properties for diagnosis of sulfide-tree growth in cables under dc stress 直流应力下电缆硫化物树生长诊断的电学特性
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.634616
P. Anelli, A. Motori, I. Ghinello, G. Mazzanti, G. Montanari
{"title":"Electrical properties for diagnosis of sulfide-tree growth in cables under dc stress","authors":"P. Anelli, A. Motori, I. Ghinello, G. Mazzanti, G. Montanari","doi":"10.1109/CEIDP.1997.634616","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634616","url":null,"abstract":"Electrical properties, that is, AC electric strength and DC conductivity, are measured at different aging times in cable models immersed in sea water with hydrogen sulfide and supplied at two voltage levels. Test conditions are studied in order to favour growth of electrochemical, or sulfide, trees. Cable models have copper conductor and polyethylene insulation. It is shown that both electric strength and conductivity significantly vary with tree-growth time, providing tools for cable degradation diagnosis.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134242071","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
Partial discharge characteristics in an artificially-simulated tree channel 人工模拟树状通道的局部放电特性
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.634622
H. Kaneiwa, Y. Suzuoki, T. Mizutani
{"title":"Partial discharge characteristics in an artificially-simulated tree channel","authors":"H. Kaneiwa, Y. Suzuoki, T. Mizutani","doi":"10.1109/CEIDP.1997.634622","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634622","url":null,"abstract":"In attempt to clarify the electrical treeing degradation, partial discharges in an artificially-simulated tree channel in a low density polyethylene (LDPE) sample were investigated. The typical PD pulse sequences from the tree channel in our experimental conditions showed that at most one PD pulse took place in a half cycle and that PD appeared in several consecutive cycles and then ceased for several cycles. In other words, there were PD pulse trains with discharge free intervals in between. There existed a strong correlation between positive and negative PD pulses occurring in two consecutive half cycles. PD pulses in a train had almost the same magnitude, though the average magnitude changed with time. In order to understand the condition for PD to cease, we investigated the polarity of the last pulse in each train. The last PD pulse tended to have the positive polarity. After a few hours of voltage application, a new tree channel was formed at the tip of the artificial tree channel. The last pulses in PD pulse trains after the formation of a new channel tended to have the negative polarity.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133867036","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
Surface waves on an oil film driven by corona-induction 由电晕感应驱动的油膜表面波
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.641169
T.S. Lee
{"title":"Surface waves on an oil film driven by corona-induction","authors":"T.S. Lee","doi":"10.1109/CEIDP.1997.641169","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.641169","url":null,"abstract":"The first demonstration of the creation of expanding circular waves an a precharged oil film spread over a flat dielectric surface used a triggering scheme of sudden grounding of the corona point. Wave initiation by the more general potential-switching method has been explored since. We introduce here a second independent experimental scheme of triggering which can be effective if pre-charging has been by a corona source and if charging level is sufficiently moderate: By switch-reducing the point potential far enough to cause corona-cessation first and then mechanically but impulsively lower the point tip near to the surface of the oil film, sudden wave initiation is invariably encountered in the process when the separation setting is below a threshold. As to the resulting surface characteristics, all essential observations resemble those associated with waves produced with the first scheme except that in a typical event expansion would ultimately cease after initial front propagation. Thus, temporal disturbance affects a maximum but finite size domain only. In this report, details from representative triggering results are presented.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"85 10-11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133356035","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
Influence of controlled morphology on space charge accumulation by using linear polyethylene blends 控制形貌对线性聚乙烯共混物空间电荷积累的影响
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI: 10.1109/CEIDP.1997.634558
M. Lindgren, A. Gustafsson, C. Tornkvist, U. Gedde
{"title":"Influence of controlled morphology on space charge accumulation by using linear polyethylene blends","authors":"M. Lindgren, A. Gustafsson, C. Tornkvist, U. Gedde","doi":"10.1109/CEIDP.1997.634558","DOIUrl":"https://doi.org/10.1109/CEIDP.1997.634558","url":null,"abstract":"Space charge measurements have been performed on model samples where the morphology is controlled by blend composition and thermal pretreatment. A low molar mass linear polyethylene fraction (L2; M/sub W/=2200 g/mol) has been blended with a high molar mass linear polyethylene. L2 was either completely segregated after isothermal crystallization or showed a limited degree of cocrystallization with the higher molar mass grade after rapid cooling from the melt. The mass crystallinity (w/sub c/) varied between 65 and 90% depending on the L2 content and the thermal pretreatment. w/sub c/ increased with increasing L2 content and was significantly higher for the isothermally crystallized samples. Space charge measurements (PEA) showed that the space charge accumulation increased strongly with increasing L2 content and thus also with increasing crystallinity. At a specified degree of crystallinity, the space charge accumulation decreased with increasing crystallization temperature.","PeriodicalId":176239,"journal":{"name":"IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133608240","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
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