2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena最新文献_第6页

Transformation of nitrogen SPS spectra emitted from streamer discharge head within a sub-nanosecond — Nanosecond range 流光放电头发射的氮SPS光谱在亚纳秒-纳秒范围内的转换

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232649

Y. Shcherbakov, L. Nekhamkin

{"title":"Transformation of nitrogen SPS spectra emitted from streamer discharge head within a sub-nanosecond — Nanosecond range","authors":"Y. Shcherbakov, L. Nekhamkin","doi":"10.1109/CEIDP.2011.6232649","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232649","url":null,"abstract":"The paper presents some results on spectroscopic studies of the filamentary streamer discharge in short air gap in stage of primary streamer propagation. Basically, we have found that the mid-resolved (with spectral resolution around 0.2-0.3 nm) nitrogen second positive system (SPS) spectra emitted from the primary streamer head changes essentially in form within some nanoseconds. Namely, main peak near the band head formed by the P-branches of Pi3-to-Pi3 transition turns almost into a widened twin-peak hump, relative intensities of each sub-peaks change in time resulting finally in a quite usual one-peak form; with inessential modification of short-wave part of the SPS-band as whole formed mainly by the R-branches. In attempt to give an appropriate realistic interpretation of this phenomenon we have analyzed different possible instrumental factors as well as mechanisms applied in streamer theory and molecular spectroscopy, such as: 1) dynamic breaking of the spin-axis coupling of the Pi3-states resulting in an appearance of Pi3(a)-to-Pi3(b)- and Pi3(b)-to-Pi3(b)-transitions additionally to a standard Pi3(a)-to-Pi3(a)-transition; 2) modeling of luminosity emitted from the actual high-gradient too narrow streamer head propagating with very high speed; 3) fast eventual heating of neutral gas within streamer head; 4) possible non-even illumination of the monochromator entrance slit due to very strong gradient of all physical parameters within streamer head and finally as well as actual sub-nanosecond temporal resolution of the measuring system; 5) Zeeman and Stark-effects. Stark-effect and instrumental peculiarities are supposed to be most adequate reasons for the phenomenon, which after development of relevant detailed theory might be applicable to determine/estimate electric field and its spatial gradient, respectively","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"95 1","pages":"271-274"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86018793","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

Bonds breaking and molecular chains straining in the electrical aging of PE and PP PE和PP电老化中键断和分子链张力的研究

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232603

J. Crine

引用次数: 0

Terahertz spectroscopy of poly(3-hydroxyalkanoate)s 聚(3-羟基烷酸酯)s的太赫兹光谱

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232630

H. Hoshina, Y. Morisawa, S. Ishii, H. Sato, I. Noda, Y. Ozaki, C. Otani

引用次数: 0

Diagnosis of severity degree for oil/pressboard insulation surface discharge 油压板绝缘表面放电严重程度诊断

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232697

Wei Wang, Yan Xue, Yangchun Cheng, Bing Zhou, Jianfeng Xu, Chengrong Li

{"title":"Diagnosis of severity degree for oil/pressboard insulation surface discharge","authors":"Wei Wang, Yan Xue, Yangchun Cheng, Bing Zhou, Jianfeng Xu, Chengrong Li","doi":"10.1109/CEIDP.2011.6232697","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232697","url":null,"abstract":"To research the diagnosis method based ultra high frequency (UHF) signal and dissolved gases analysis (DGA) in oil of severity degree for oil/pressboard insulation surface discharge, a surface discharge simulation and test equipment and measurement system have been set up in laboratory, which were consisted of surface discharge model, test tank, UHF sensor, gas-phase chromatographic instrument and partial discharge detector. Surface discharge growth from inception to breakdown has been simulated, test voltage was raised step by step, ultra high frequency signal and dissolved gases in oil have been measured in the growth. The results show that severity degree of surface discharge can be divided tree stages: inception stage, growth stage and critical stage according to statistics spectrum of the ultra high frequency signal; ultra high frequency signal and dissolved gases in oil both can indicate the oil/pressboard surface discharge severity degree, however, dissolved gases analysis method was not as sensitive as ultra high frequency method; C2H2/total hydrocarbon generated by oil/pressboard surface discharge was more than 10%; Surface discharge was in critical stage when C2H2/total hydrocarbon value more than 50% and raised rapidly.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"5 1","pages":"472-475"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87545989","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

The comparison of sensitivity between the UHF and ultrasonic methods for partial discharge detecting in GIS GIS中超高频和超声检测局部放电的灵敏度比较

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232696

Bibo Geng, Chengrong Li, B. Qi, Le Yu, Jixin Gao

引用次数: 5

Electronic conduction properties of TiO2 thin films under UV light irradiation 紫外光照射下TiO2薄膜的导电性能

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232610

Y. Watanabe, Y. Muramoto, N. Shimizu

引用次数: 2

Electrical breakdown strength characteristics of palm kernel oil ester-based dielectric fluids 棕榈仁油酯基介电流体的电击穿强度特性

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232627

A. Abdelmalik, J. Fothergill, S. Dodd

引用次数: 10

Accurate temperature correction of dissipation factor data for oil-impregnated paper insulation bushings: Field experience 油浸纸绝缘套管耗散系数数据的精确温度校正:现场经验

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232644

D. Robalino

{"title":"Accurate temperature correction of dissipation factor data for oil-impregnated paper insulation bushings: Field experience","authors":"D. Robalino","doi":"10.1109/CEIDP.2011.6232644","DOIUrl":"https://doi.org/10.1109/CEIDP.2011.6232644","url":null,"abstract":"Typically, dissipation factor (DF) or power factor (PF) test is carried out in the field following well known procedures. It is not necessary to emphasize the importance of dielectric test for power system operators. Accurate recording of insulation temperature values during the test is critical but not always feasible in the field. DF measured values are later normalized to a 20°C base for future comparison and trending. Nevertheless, as stated in several international publications, accuracy of temperature correction is still under investigation because temperature correction factors (TCF) from reference tables do not consider the percentage moisture concentration of the insulation system. The existing Temperature Correction Tables correspond to a variety of insulation materials and construction of different high voltage electrical equipment and components. Therefore, the application of state-of-the-art technologies to determine “specific” temperature correction factors for DF, is essential to provide reliable interpretation of results and proper equipment condition assessment. Frequency Domain Spectroscopy (FDS) in conjunction with DF Analysis are a powerful tool to determine the percentage moisture concentration in solid insulation capable to estimate Individual Temperature Compensation (ITC) of DF measured data of power transformers. Throughout this document, field experience is summarized when a three-winding transformer is removed from service and put to a series of testing procedures including DF, FDS and tip-up test on the high voltage bushings. Results of the analysis, experimental data and conclusions made based on the obtained results are presented herein.","PeriodicalId":6317,"journal":{"name":"2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"43 1","pages":"251-254"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87338016","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: 12

The influence of square voltage waveforms on transformer insulation break down voltage 方形电压波形对变压器绝缘击穿电压的影响

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232593

T. Koltunowicz, A. Cavallini, D. Djairam, G. Montanari, J. Smit

引用次数: 18

Comparison of PD characteristics and degradation in PET insulation with vented and unvented voids 有气孔和无气孔的PET绝缘的PD特性和降解的比较

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI: 10.1109/CEIDP.2011.6232690

D. Adhikari, D. Hepburn, B. Stewart

引用次数: 7