2011 Electrical Insulation Conference (EIC).最新文献_第2页

The thermal and electrical properties of nano-silicon dioxide filled epoxy systems for use in high voltage insulation 用于高压绝缘的纳米二氧化硅填充环氧体系的热学和电学性能

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996206

M. Reading, Zhiqiang Xu, A. Vaughan, P. Lewin

引用次数: 16

Applicability of the dielectric response methods of diagnostics of power transformers: Hungarian experiences 电力变压器介电响应诊断方法的适用性:匈牙利经验

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996114

B. Németh, G. Csépes, C. Voros

{"title":"Applicability of the dielectric response methods of diagnostics of power transformers: Hungarian experiences","authors":"B. Németh, G. Csépes, C. Voros","doi":"10.1109/EIC.2011.5996114","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996114","url":null,"abstract":"The actual life of transformers strongly depends on the real operating conditions and the residual life of these units can spread in a fairly broad scale. The key factor is the presence of moisture and ageing products because they strongly influence the condition of oil-paper insulation. Therefore recent attention has been directed to methods of determining moisture content and ageing products in the transformer. There are two fundamental dielectric processes in transformer insulation: the conduction which is characterized by conductivity, and the polarization characterized by the polarization spectrum. Both processes are in very strict relation to the structure of the material. Any changing of the structure caused by the deterioration of insulation brings a typical alteration of the dielectric processes and the dielectric parameters of insulation as well. Thus the shape of polarization spectrum is characteristic not only to the insulation material, but to its deteriorating processes to its condition as well. Especially the long-time constant range of the polarization spectrum gives a lot of information about the deteriorating processes of insulation. The Hungarian results — one detail has been only shown in this paper — could improve the interpretation of results of spectrum methods; it is useful in evaluating the condition of the oil-paper insulation and allows observation of the progress of the aging and moistening process in oil-paper insulation.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"173 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":"125791451","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

Implementation of statistical principles to reflect the long term performance of composite insulators 实施统计原则，以反映复合绝缘子的长期性能

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996124

A. Tzimas, S. Rowland

{"title":"Implementation of statistical principles to reflect the long term performance of composite insulators","authors":"A. Tzimas, S. Rowland","doi":"10.1109/EIC.2011.5996124","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996124","url":null,"abstract":"There are numerous advantages of polymeric composite insulators over the traditional ceramic ones. However composite insulators, being comprised of organic elements, age more rapidly over time. Environmental conditions control both the manner in which composite insulators age, and the effective stresses that insulator strings are exposed to in service. The current work presents a statistical methodology to reflect the reliability of a network consisting of composite insulators. This accounts for the working environment and its impact on both the ageing of the insulator and risk of flashover. This is achieved by combining previously established statistical dimensioning principles according to the site's pollution severity and a four-state Markov ageing model. The risk of flashover is estimated according to the site's pollution severity using statistical principles. Then by choosing appropriate transition probabilities between the states of Markov's ageing process the population of insulators at risk of flashover because of ageing is estimated. The combination of the risk of flashover due to the pollution severity and due to ageing of the insulators results in an estimation of risk of flashover for a given number of insulators in a given point in time. The resulting forecast of flashover performance could be used to assist asset management decisions as well as optimising condition monitoring of composite insulators.","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":"132328690","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

Dependencies of the PD- and tan(δ)-characteristics on the temperature and ageing status of MV PILC cables 中压PILC电缆PD-和tan(δ)-特性与温度和老化状态的关系

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996122

I. Mladenovic, C. Weindl

{"title":"Dependencies of the PD- and tan(δ)-characteristics on the temperature and ageing status of MV PILC cables","authors":"I. Mladenovic, C. Weindl","doi":"10.1109/EIC.2011.5996122","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996122","url":null,"abstract":"Diagnostic tools and methods for the state evaluation of MV (medium voltage) and HV (high voltage) power cables are mostly based on single key parameters like the partial discharge (PD) levels (inception voltage and intensity) or the values of the dissipation factor tan(δ). The main goals are the determination of the functionality and actual condition of the equipment. Additionally, the prediction of the rest life-time of power components could help to improve the investment planning and the maintenance strategy. In the field of cables and especially in case of PILC (Paper Insulated Lead Covered) cables, the requirements on the measurement technology and diagnostic systems are rather complex. In many cases the attention is directed to the methodology and the accuracy of the measurement equipment itself or to the value or spectrum of the measurement frequencies. However, the reliability of these methods is also very dependent on the experience of the test engineers and the knowledge and interpretation of all measured parameters. Therefore, besides the electrical parameters, in particular the temperature and humidity during the measurement, the equipment's dimensions, cable lengths and noise levels besides others must be taken into account. In this article, the principal dependencies of two major electrical criteria, which are the tan(δ)- and the PD-characteristics on the cable temperature and the cable age or the operational history of the cables, are presented. The strong correlation on e.g. the temperature makes clear, that the interpretation of a single criteria and a subsequent prognoses of the cable status are nearly impossible without further information. The derived results would be a subject of an immense scattering depending on seasonal influences, the load status during the disconnection of the analyzed lines, time constants, cable length, etc.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"144 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":"132374215","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

A portable instrument for the location and identification of defects generating PD 用于定位和识别产生PD的缺陷的便携式仪器

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996200

R. Candela, A. Contin

引用次数: 20

Online detection of endwinding contamination in industrial motors 工业电机端部污染的在线检测

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996159

P. Neti, Pinjia Zhang, X. Qi, Yingneng Zhou, K. Younsi, M. Shah, K. Weeber

引用次数: 14

Transformer insulation risk assessment under smart grid environment due to enhanced aging effects 老化效应增强的智能电网环境下变压器绝缘风险评估

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996161

R. Ghunem, M. Hamid, S. Jayaram, R. Seethapathy, A. Naderian

{"title":"Transformer insulation risk assessment under smart grid environment due to enhanced aging effects","authors":"R. Ghunem, M. Hamid, S. Jayaram, R. Seethapathy, A. Naderian","doi":"10.1109/EIC.2011.5996161","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996161","url":null,"abstract":"The potential of having a more efficient and cost-effective source of power in the market has driven the incentive to inject distributed generation through smart grids. Distributed generation has been proposed to be a source of sustainable energy. However, the increased use of power electronic devices linking the distributed generation to the existing grid can produce a considerable amount of harmonics. Moreover, the use of power factor correction capacitors at the distributed generation interfacing the grid can amplify the harmonic distortion level due to system resonance. Thus, the injected frequency components to the grid can play a significant role in introducing enhanced stresses on the electrical insulation system on vital power system components; like transformers. In this paper, the effect of the harmonics' injection, as a consequence of the distributed generation interface to the grid, on the degradation of the transformer insulation system is studied. Experiments on degrading transformer paper insulation samples with harmonic-polluted voltages are performed. Dissipation factor increment ratio is used as a measure of the aging effect on insulation. It has been found that the dissipation factor increment ratio of the transformer paper insulation is significantly higher, when stressed with distorted voltage waveforms compared to the power frequency voltage stresses.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"35 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":"129855384","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

Update on partial discharge screening tests for stator bars & coils 定子棒和线圈局部放电筛选试验的最新情况

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996107

W. McDermid, J. Bromley, T. Black

引用次数: 8

Surface insulation performance of epoxy resin/silica nanocomposite material 环氧树脂/二氧化硅纳米复合材料的表面绝缘性能

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996153

W. Yan, B. T. Phung, Z. J. Han, K. Ostrikov

{"title":"Surface insulation performance of epoxy resin/silica nanocomposite material","authors":"W. Yan, B. T. Phung, Z. J. Han, K. Ostrikov","doi":"10.1109/EIC.2011.5996153","DOIUrl":"https://doi.org/10.1109/EIC.2011.5996153","url":null,"abstract":"Composite polymer insulators provide many advantages over the traditional porcelain insulators and they are increasingly being used at both transmission and distribution levels. In the present paper, an epoxy resin/silica nanocomposite dielectric material (NDM) structure is proposed and fabricated. Hydrophobic fumed silica is incorporated in epoxy resin matrix and acetone is adopted as media agent to effectively achieve homogenous dispersion of the nano-scale silica filler. The acetone also acts as diluents to reduce viscosity before the curing phase of epoxy resin and enables bubbles to escape from being trapped. Through partial discharge (PD) and surface aging tests, it is illustrated that the inception of surface discharge of the proposed NDM is relatively higher than that of the non-filled counterpart, and a better PD resistivity was observed in the negative half cycle regarding to applied AC voltage. Results of surface aging test indicate that surface discharge activity is retarded over the test conducting time. By contrast, surface discharge developed to the opposite way on the non-filled sample. Therefore, the proposed NDM could provide better safety reliability and lower maintenance cost to industrial application compared with nonfilled conventional epoxy resin.","PeriodicalId":129127,"journal":{"name":"2011 Electrical Insulation Conference (EIC).","volume":"26 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":"114410282","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: 6

New test method to evaluate the thermal aging of aramid materials 芳纶材料热老化性能评价的新方法

2011 Electrical Insulation Conference (EIC). Pub Date : 2011-06-05 DOI: 10.1109/EIC.2011.5996196

S. A. Filliben

引用次数: 6