Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)最新文献_第5页

An investigation about the PD degradation of thin polymer films and its correlation with surface charge decay measurements 聚合物薄膜的PD降解及其与表面电荷衰减测量的关系研究

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995953

L. Centurioni, F. Guastavino, E. Torello

{"title":"An investigation about the PD degradation of thin polymer films and its correlation with surface charge decay measurements","authors":"L. Centurioni, F. Guastavino, E. Torello","doi":"10.1109/ELINSL.2002.995953","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995953","url":null,"abstract":"The adoption, in electrical drives, of power supplies equipped with fast electronic devices lead to new \"life\" problems (e.g. degradation due to partial discharges) which impact on the design of the relevant electric machines insulation systems. Hereby are reported some results of an investigation about the behaviour of thin PET and PI films (polymers adopted in the above insulation systems) after exposure to the action of surface partial discharges (PD) due to PWM-like voltages. The relevant damage after suitable aging (different humidity (RH%) and different PD exposure times) has been examined through of a procedure based on charge decay measurements on the aged films surface. After corona (both positive and negative) charging the films, the surface charge distribution was obtained at different times, so to get the charge decay profiles. The relevant results, depending on films, ambient PD aging conditions, and corona polarity, showed different degrees of correlation between the films surface degradation, the surface charge distribution and the measured charge decay profiles. The latter profiles analysis suggests that this approach can offer complementary information to investigate the PD degradation phenomena that would impact on the insulation systems performance.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"64 1","pages":"371-374"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75201038","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: 10

Effect of reduced viscosity on the electrical characteristics of transformer and switchgear oils 粘度降低对变压器和开关柜油电气特性的影响

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995951

M. Pompili, C. Mazzetti

引用次数: 9

Long term evaluation of insulator coatings at one of the Pacific Intertie HVDC converter stations 太平洋Intertie高压直流换流站绝缘子涂层的长期评价

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995932

B. Almgren, B. Jacobson, Dong Wu

{"title":"Long term evaluation of insulator coatings at one of the Pacific Intertie HVDC converter stations","authors":"B. Almgren, B. Jacobson, Dong Wu","doi":"10.1109/ELINSL.2002.995932","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995932","url":null,"abstract":"Since the Pacific HVDC Intertie was commissioned in 1970, measures have been taken to prevent pollution flashovers of the outdoor insulators at the Sylmar West Converter Station. In April 1991, a research program was started with a view to finding the optimum type and layer thickness for different insulator coatings available at the time. Various types and thicknesses of insulator coatings and one type of massive silicone rubber plate were installed, together with bare porcelain plates as references, on test racks at the station. Annual inspections were performed the first three years and the last one after 10 years of exposure. The following conclusions may be drawn from the research program. Most plates coated with silicone grease of three different types and in three different layer thicknesses were still water repellent after 10 years of exposure. The massive silicone rubber plate and one out of three RTV coatings also showed good performance, while the other two types of silicone rubber coating had become wetter. Silicone greases performed better than other coatings in this test. A thin layer of coating, e.g. 0.5-1 mm, is sufficient for good long-term performance.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"9 1","pages":"285-289"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77134117","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

The temperature distribution and thermal stress analysis of pole cast resin transformer for power distribution 配电用极铸树脂变压器的温度分布及热应力分析

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995956

Han-Goo Cho, U. Lee, Seok-Su Kim, Young-Don Park

引用次数: 8

Recent investigations on high current internal arcs in low voltage switchgear 低压开关柜大电流内弧的研究进展

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995945

S. Finke, D. Koenig

引用次数: 0

Influence of different square voltage waveforms on the partial discharges behaviour during tests on twisted pair specimens 不同方波电压对双绞线试件局部放电特性的影响

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995875

G. Coletti, F. Guastavino, E. Torello

引用次数: 15

Insulator surface charge accumulation under DC voltage 直流电压下绝缘子表面电荷积累

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995966

F. Wang, Q. Zhang, Y. Qiu, E. Kuffel

引用次数: 14

Use of low frequency harmonic components as a signature to detect arcing on HTV silicone rubber in salt-fog 利用低频谐波分量作为信号检测盐雾中高温硅橡胶的电弧

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995915

A. El-Hag, S. Jayaram, E. Cherney

引用次数: 11

Insulation cure monitoring on global VPI large AC motors 全球VPI大型交流电动机绝缘固化监测

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995982

R. Mills, C. Payne, K. Younsi

{"title":"Insulation cure monitoring on global VPI large AC motors","authors":"R. Mills, C. Payne, K. Younsi","doi":"10.1109/ELINSL.2002.995982","DOIUrl":"https://doi.org/10.1109/ELINSL.2002.995982","url":null,"abstract":"Epoxy resins and micaceous insulation systems are used to insulate high voltage large rotating machine components. Composite insulation systems undergo marked changes in dielectric response as the cure of the system progresses. It is possible to exploit these changes to monitor and optimize the curing process. This paper presents the first of some work done on the global insulation cure monitoring of large AC motor stator windings processed through global vacuum pressure impregnation (VPI). Changes in the measured permittivity and dissipation factor in the range of 1 Hz to 10 kHz for laboratory samples, as well as capacitance test results on full size stators at 100 Hz, are reported. It is shown that permittivity (capacitance) appears to be ideal for cure monitoring purposes. It is also shown that the best frequencies for monitoring of this type are in the 100 Hz to 500 Hz range. Changes in the slope of the natural logarithm of permittivity (capacitance) with time (d[Ln(/spl epsi/')]/dt) are shown to be promising as an indicator of the level of cure. By terminating the curing when d[Ln(/spl epsi/')]/dt reaches a certain terminal value, it is believed that a high level of reproducibility in the level of cure of the resulting insulation system can be achieved. Discussion is given on analyses of d[Ln(/spl epsi/')]/dt, both in the laboratory and in the factory. The level of cure should also be correlated to other relevant physical properties such as the glass transition temperature or other global mechanical properties. It is shown how dielectric properties monitoring optimizes global VPI processing by producing a more reliable level of cure and reducing cure time.","PeriodicalId":10532,"journal":{"name":"Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)","volume":"62 1","pages":"492-496"},"PeriodicalIF":0.0,"publicationDate":"2002-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73488923","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

Indexes for the recognition of insulation system defects derived from partial discharge measurements 由局部放电测量得出的绝缘系统缺陷识别指标

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI: 10.1109/ELINSL.2002.995986

A. Cavallini, M. Conti, G. Montanari, A. Contin

引用次数: 7