2011 Electrical Insulation Conference (EIC).最新文献_第7页

CFD simulation for a self-blast high voltage circuit breaker: Mixing and heat transfer 自爆高压断路器的CFD模拟:混合与传热

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996214

M. Dhotre, X. Ye, S. Kotilainen, M. Schwinne, R. Bini

引用次数: 9

Evaluation of various transformations to extract characteristic parameters from vibration signal monitoring of power transformer 对电力变压器振动信号监测中提取特征参数的各种变换进行评价

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996164

B. S. Munir, J. Smit

{"title":"Evaluation of various transformations to extract characteristic parameters from vibration signal monitoring of power transformer","authors":"B. S. Munir, J. Smit","doi":"10.1109/EIC.2011.5996164","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996164","url":null,"abstract":"Vibration Analysis has been beneficial for monitoring and assessment of High Voltage Transformer winding and core condition. A lot of research has been conducted to extract useful information from the vibration signals using various transformation methods. In this paper, several methods are evaluated to determine which method is better in providing consistent and reliable parameters to be used as a fingerprint for the transformer condition. The evaluation is conducted using a set of vibration signals taken sequentially with the same condition. The first evaluated method is Fast Fourier Transform (FFT) which is generally and effectively used to compute Discrete Fourier Transform. This method decomposes the vibration signal into various signals with different frequency and amplitude. The second evaluated method is Hilbert Huang Transform (HHT) which separated vibration signal into a finite and small number of Intrinsic Mode Functions (IMF) before applying Hilbert Transform. Since HHT has some intrinsic shortcomings a third method is evaluated which combine Wavelet Packet Transform (WPT) with HHT. WPT is used to decompose the vibration signal into a set of narrow band before being screened to have only the greatest energy signal. Furthermore HHT is applied to the signal after being recomposed. The evaluation result shows that only the main frequency signal can be used as a consistent and reliable parameter to construct fingerprints of the power transformer condition.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"42 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":"132114846","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: 15

Computer aided design of an end corona protection system for accelerated voltage endurance testing at increased line frequency 提高线路频率下加速电压耐久试验的端电晕保护系统的计算机辅助设计

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996140

C. Staubach, S. Kempen, F. Pohlmann, F. Jenau

{"title":"Computer aided design of an end corona protection system for accelerated voltage endurance testing at increased line frequency","authors":"C. Staubach, S. Kempen, F. Pohlmann, F. Jenau","doi":"10.1109/EIC.2011.5996140","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996140","url":null,"abstract":"Due to highly nonlinear material characteristics the design of end corona protection systems (ecp-system) is a time consuming process. In order to accelerate this process a finite element model is developed. The model takes the nonlinear electrical and thermal coupled material properties into account. Furthermore it is able to calculate the electric and thermal behaviour of a painted or taped ecp-system. In this paper a special model is used to design a 500 Hz ecp-system. The paper quantifies why it is not possible to apply the ecp-system that was designed for power frequency also at a ten times higher frequency. Such a system is needed to accelerate the determination of the voltage endurance characteristics enabling the qualifying process of new or modified stator groundwall insulation of large turbine generators. In the first step the electrical and thermal behaviour of the insulation system with an existing ecp-configuration (50 Hz and rated voltage of 27 kV) is recalculated for an increased frequency of 500 Hz and 33 kV. In the next step an optimized layout is calculated with a new numerical algorithm, which is implemented in the finite element calculation and being efficient with calculation time. The newly developed design is verified by a test setup operating at 500 Hz and the electrical field strength distribution and temperature profile is measured.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"13 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132771527","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

High voltage power transformer insulation design 高压电力变压器绝缘设计

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996148

W. Ziomek, K. Vijayan, D. Boyd, K. Kuby, M. Franchek

{"title":"High voltage power transformer insulation design","authors":"W. Ziomek, K. Vijayan, D. Boyd, K. Kuby, M. Franchek","doi":"10.1109/EIC.2011.5996148","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996148","url":null,"abstract":"The large power transformer life span depends heavily on insulation — its condition, materials, composition, geometry, etc. The high voltage transformer insulation requires a very focused analysis in the design stage. The large power transformer is subjected to different overvoltages during factory testing and in operation, therefore all resulting electric stresses have to be modeled in the electric field program and compared to the industry accepted withstand curves. The overvoltages include transient voltages from impulse testing, both lightning and switching, as well as power frequency voltages generated during the induced and applied voltage tests. The distributions of electric stresses under these different electric excitation conditions are different. The transient voltage programs with MLCR components (mutual- and self-inductance, capacitance, resistance) are used to establish exact voltage distribution inside the transformer. The electric field analysis for complex units is performed for all energized components, including turn-to-turn, section-to-section, winding-to-winding, winding to core, phase-to-phase, between leads, from winding and leads to constructional parts, bushing to tank, etc. The electric stresses are checked under two main conditions: (i) strike in oil, (ii) creeping discharge along solid insulation. The paper will discuss the analysis for selected transformers and explain the design process needed to maintain the dielectric stresses under critical values.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"3 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":"127403729","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: 39

Locating partial discharge sources in high voltage transformer windings 高压变压器绕组局部放电源的定位

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996145

P. Lewin, I. Golosnoy, R. Mohamed

{"title":"Locating partial discharge sources in high voltage transformer windings","authors":"P. Lewin, I. Golosnoy, R. Mohamed","doi":"10.1109/EIC.2011.5996145","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996145","url":null,"abstract":"The analysis of partial discharge (PD) measurement data obtained using radio frequency current transducers (RFCT) incorporated into the external earthing connections (i.e bushing tap points and neutral to earth connections) offers the possibility of on-line condition monitoring of large transformers. A method for locating PD sources in windings has been developed, based on analysis of differential equations that model the propagation of PD signals from the source to the measurement point. Analysis reveals that if the discharge at the source is assumed to be impulse-like, then the form of the response at the measurement points can be simulated as a function of source location along the winding. If all parameters of the winding are known then it is possible to model the response, however, in the field this is often not the case. So the method developed here uses information from the PD measurements themselves to estimate the unknown coefficients required to simulate the likely discharge currents. With these estimates it is then possible to compare PD measurement information with simulation data in order to identify the most likely location of a PD source. An experiment based on a section of high voltage winding has been used to produce PD measurement data and to validate the proposed approach.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"18 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":"128737163","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

Dielectric Barrier Discharge (DBD) dynamic modeling for high voltage insulation 高压绝缘介质阻挡放电(DBD)动态建模

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996137

M. Ghassemi, H. Mohseni, K. Niayesh, A. Shayegani

引用次数: 10

Evaluation of surface alteration of polypropylene film for power capacitors 电力电容器用聚丙烯薄膜表面变化的评价

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996210

Chao Zhang, S. Rigby, Robert C. Kempke, C. L. Fellers, Marco J. Mason, Xiaoyi Shen

引用次数: 1

Novel spirally-wound insulation for straight HVDC conductors to avoid voltage stress inversion 新型直流直流电导体螺旋绕线绝缘，避免电压应力反转

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996213

R. Faulkner, E. Ildstad

引用次数: 3

Epoxy-anhydride VPI resin with low viscosity and application in 5MW permanent magnet synchronous wind-driven generators 低粘度环氧酸酐VPI树脂及其在5MW永磁同步风力发电机中的应用

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996134

Zeng Caiping, Xia Yu

引用次数: 0

Design of the insulating supports in medium voltage dry-type transformers 中压干式变压器绝缘支架的设计

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996113

V. González, P. Gómez, F. Espino-cortes

引用次数: 1