2011 Electrical Insulation Conference (EIC).最新文献_第9页

Critical cavity size producing internal discharges in stator bar ground wall insulation 定子棒接地壁绝缘产生内部放电的临界空腔尺寸

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996170

A. Turgeon, C. Hudon, D. Nguyen

引用次数: 7

Insulation diagnosis for 220kV oil-immersed current transformer by frequency dielectric spectroscopy 频率介电光谱法诊断220kV油浸式电流互感器绝缘

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996118

Hua-dong Peng, M. Dong, M. Ren, J. Miao, Zhi Zhang

{"title":"Insulation diagnosis for 220kV oil-immersed current transformer by frequency dielectric spectroscopy","authors":"Hua-dong Peng, M. Dong, M. Ren, J. Miao, Zhi Zhang","doi":"10.1109/EIC.2011.5996118","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996118","url":null,"abstract":"Current transformer (CT) is used for protection of major components and to provide continuity of operation in power system. Failure of CT may lead to an energy explosion and result in phase to ground fault that will hinder the operation of a substation. Therefore insulation diagnosis is of great importance for evaluation of CT. As a non-destructive dielectric testing tool, Frequency Dielectric Spectroscopy (FDS) is widely used by power utility for assessments of the condition of electrical equipments such as transformer and cable, but seldom used on CT. Due to the similarity of transformer's insulation, the insulation condition of oil-paper insulation CT may be evaluated by FDS. In this paper, with the frequency range from 10−2∼103Hz, FDS has been investigated on insulation condition assessment for several 220kV oil-immersed CTs. Complex permittivity and dissipation factor data are obtained as a function of frequency for each CT. To verify the validity of FDS, high voltage dissipation factors from 10kV to 145kV have been measured by Schering Bridge and compared with the FDS result at power frequency. Results indicate that FDS evaluation is a reliable tool for determination of moisture content in papers and of oil conductivities.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133034896","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: 7

Optimization of electric field grading systems in non-ceramic insulators 非陶瓷绝缘子电场分级系统的优化

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996152

D. Dominguez, F. Espino-cortes, P. Gómez

引用次数: 5

Effect of voltage type and polarity on the gas temperature of an arc over an ice surface 电压类型和极性对冰表面电弧气体温度的影响

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996126

A. Nekahi, M. Farzaneh

引用次数: 4

Effect of insulator configuration on ageing deterioration of polymer insulators 绝缘子结构对聚合物绝缘子老化劣化的影响

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996125

Taeko Tanahashi, S. Ishikawa, Masahito Imai, Tomoyasu Sasaki, H. Shinokubo, R. Matsuoka, Masayoshi Suzuki, Masanori Isozaki

{"title":"Effect of insulator configuration on ageing deterioration of polymer insulators","authors":"Taeko Tanahashi, S. Ishikawa, Masahito Imai, Tomoyasu Sasaki, H. Shinokubo, R. Matsuoka, Masayoshi Suzuki, Masanori Isozaki","doi":"10.1109/EIC.2011.5996125","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996125","url":null,"abstract":"According to our accelerated ageing test results of 275-kV full scale insulator strings coated with the same silicone rubber, conventional porcelain long-rod insulators showed better anti-ageing performance compared with transmission line polymer insulators. As the reason for such results two factors are considered. One is difference in core diameter, and the other is difference in shed shape. In order to clarify the reason for such results, we started comparative accelerated ageing tests on five different specimens, coated with the same room temperature vulcanized silicone rubber, with almost the same shed shapes but three different core diameters and with almost the same core diameters but three different shed shapes. As of 380 cycles of accelerated ageing test, any discernible deterioration was not observed on any specimens, although partial discharges had been observed at the energized end core surface of the transmission line polymer insulator after 200 cycles. It takes so long to get any significant deterioration by the accelerated ageing test. Since it is considered that the main cause of surface deterioration of polymer insulators is partial discharges, we investigated the partial discharge inception voltages of these specimens under contaminated and wet conditions. The transmission line polymer insulator showed the lowest partial discharge inception voltage. Very large ratio of shed to core diameter is considered to be the cause of easy occurrence of partial discharges due to concentrated voltages allotted at the core surfaces. We prepared three specimens to improve the voltage distribution of the transmission line polymer insulator and evaluated. Promising results were obtained.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"198 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122598721","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

On-line partial discharges monitoring of high voltage XLPE / fluid-filled transition joints 高压XLPE /充液过渡接头局部放电在线监测

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996177

L. Testa, A. Cavallini, G. Montanari, A. Makovoz

{"title":"On-line partial discharges monitoring of high voltage XLPE / fluid-filled transition joints","authors":"L. Testa, A. Cavallini, G. Montanari, A. Makovoz","doi":"10.1109/EIC.2011.5996177","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996177","url":null,"abstract":"Partial Discharge (PD) measurement is an effective method to detect degradation processes in medium and high voltage equipment. As an example, after-laying PD test have become mandatory in many countries as a commissioning test for high voltage cable systems. This type of test can assess the presence of defects just after installation, but thermal cycling, electrical and thermal stress as well as contamination can lead to the onset of defects at a later time. To cope with defects arising during operation, the key is PD monitoring (offline tests are often too costly in terms of equipment, personnel and loss of revenues). This paper presents the application a of permanent PD monitoring system based on a Ultra-Wide band (UWB) detector to high voltage transition joints linking old fluid-filled cables with new XLPE cable lines. These cable accessories are highly critical because of the complexity of their insulation system and the fact they are realized on field (uncontrolled environment). The innovative monitoring scheme fully exploits the benefits coming from using a UWB detector, i.e., selective tracking of PD based on PD pulse characteristics. This approach enables to trend various PD sources separately, highlighting those that are associated with degradation phenomena within the insulation system. This approach will be unraveled and demonstrated by monitoring data coming from two cable lines.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125155094","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

Tracking stator bar condition by on-line partial discharge measurements 通过在线局部放电测量跟踪定子棒的状态

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996171

W. McDermid, T. Black

引用次数: 2

Condition assessment of cables and transformers in an aging infrastructure (and aging talent base) 老化基础设施中电缆和变压器的状态评估(以及老化的人才基础)

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996104

N. Singh

{"title":"Condition assessment of cables and transformers in an aging infrastructure (and aging talent base)","authors":"N. Singh","doi":"10.1109/EIC.2011.5996104","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996104","url":null,"abstract":"The rapid industrialization that followed World War 11 required electricity to power and sustain this ensuing growth. As a result, infrastructure for electric power was put in place at an accelerating pace in subsequent decades, resulting in aging equipment. The challenges presented in taking better care of aging infrastructure include technical, lack of commensurate efforts and availability of sufficient financial resources. The gradual erosion of expertise and long general lack of hands-on electrical power equipment education in the US does not help either nor does the significantly reduced manufacturing power equipment base, as we address the aging equipment. The West Europeans and Japanese are in a better position toward this end, due to relatively robust electrical power equipment manufacturing, exporting strengths and active equipment — related graduate education. The prevailing utility business climate brought about by deregulation, competition and increasing fiscal restraints dictate that maximum and trouble-free use is made of aging infrastructure. This places focus on reliable and cost-effective diagnostic tests. While such tests have been always addressed and improved over decades, the need has never been greater, as of now. This paper covers the condition and life assessment of laminar dielectric transmission cables, power transformers and extruded cable terminations containing a dielectric fluid through Dissolved Gas Analysis (DGA). Several successful cases showing the extent of insulation damage from minor to severe as revealed by DGA-prompted equipment openings are presented. All the cable systems were re-built. This demonstrates that the techniques and lessons learned from one product can be profitably applied to another, despite lack of markedly different dielectric materials, designs and operating conditions. The general lack of hands-on equipment-related graduate education has been addressed, and ameliorative measures emphasized to aid in taking better care of aging equipment.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116869975","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

IEC qualification test applied to capacitively graded 13.8 kV bar samples energized with repetitive fast pulses 适用于用重复快速脉冲通电的电容级13.8 kV棒样的IEC鉴定试验

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996187

E. Sharifi, S. Jayaram, E. Cherney, S. Haq, R. Omranipour

引用次数: 11

Partial discharge localization in transformers using UHF sensors 使用超高频传感器的变压器局部放电定位

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996117

H. H. Sinaga, B. Phung, P. L. Ao, T. Blackburn

引用次数: 11