Conference Record of the 2006 IEEE International Symposium on Electrical Insulation最新文献_第3页

Thermal endurance testing of rotor turn insulating materials 转子匝绝缘材料热耐久性试验

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665248

D. Manns

引用次数: 2

Considerations of conduction mechanism of LDPE under AC high field 交流高场下LDPE导电机理的思考

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665364

K. Tohyama, Y. Murata, M. Nagao

{"title":"Considerations of conduction mechanism of LDPE under AC high field","authors":"K. Tohyama, Y. Murata, M. Nagao","doi":"10.1109/ELINSL.2006.1665364","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665364","url":null,"abstract":"Polyethylene is widely used as an insulating material, for power cables under AC high field. Dissipation current waveform observation method, which has been developed by authors, is very powerful technique to detect high field nonlinear dielectric property and by using this method, not only the various kinds of numerical processing but also the observation under the various kinds of applied voltage waveform by using arbitrary function generator are possible. In order to clarify the conduction mechanism of polyethylene under AC high field and to know which factor influences on the AC conduction, various kinds of experiments, such as the effect of acetophenone or alpha-methylstyrene soaking, the frequency dependence of dissipation current waveforms, the effect of an instantaneous changing rate of applied electric field (dE/dt) by using a high field trapezoid-like arbitrary waveform and so on, were carried out by using several thickness of LDPE film and sheet samples. Some results were analyzed by using FFT analyzing program and it was estimated the fundamental component of the dissipation current waveform. As the results of these experiments, it will be discussed the high field AC conduction mechanism with the effect of dE/dt and the applied frequency","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124822819","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 influence of mobile signal in UHF PD monitoring and our solving 移动信号对超高频PD监测的影响及解决方法

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665300

Wei Wang, Chengrong Li, Bin Zheng, Guiqian Zhao

引用次数: 1

The system architecture of selective frequency balance measurement for PD 针对 PD 的选择性频率平衡测量系统架构

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665279

L. Gang, Wu Guangning, T. Demin

{"title":"The system architecture of selective frequency balance measurement for PD","authors":"L. Gang, Wu Guangning, T. Demin","doi":"10.1109/ELINSL.2006.1665279","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665279","url":null,"abstract":"PD (partial discharge) measurement is one of the most important parts in HV (high voltage) diagnostics. There are a lot of measuring methods of PD, such as impulse current, ultra-high frequency, super sonic method, and so on. The impulse current method is the earliest used in PD detection and is the most basic. Further the balance method is one of the impulse current methods. This method has higher inference rejected ability than others. But, the input circuits of traditional balanced PD measurement methods are composed of two parallel circuits of resistance and capacitance. There are many disadvantages with using this measuring circuit such as utilizing its application in HV and UHV (ultra-high voltage) measurements. A new selective frequency balance measurement theory for PD was put forward by the authors in 1988. The device, which was based on this theory, was also determined. Now, it will be verified in the HV field. The noise signal can be rejected more than 1000 times by this device. Furthermore, the device is very easy and cheap to produce using the new theory. The system structure of the selective frequency balance measurement circuit is dissertated. The design method is also explained and measuring results are illustrated","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127354630","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

High speed catastrophic events in technical insulating liquids 技术绝缘液体中的高速灾难性事件

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665263

A. Jaksts, G. Blanchet

引用次数: 3

An experiment study of partial discharge pattern recognition method based on wavelet neural networks 基于小波神经网络的局部放电模式识别方法实验研究

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665299

D. Zheng, Chunhui Zhang, Guo-qing Yang, Xueyong Sun

{"title":"An experiment study of partial discharge pattern recognition method based on wavelet neural networks","authors":"D. Zheng, Chunhui Zhang, Guo-qing Yang, Xueyong Sun","doi":"10.1109/ELINSL.2006.1665299","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665299","url":null,"abstract":"Considering the time-frequency characteristic of the partial discharge (PD) signals, the kind of improved wavelet neural network is constructed by principle of the temporal-scaling approach, and it is that using temporal-scaling domain of the wavelet basis function being chosen covers that of the partial discharge signals. It is fact that the PD signals are transformed by the wavelet based on the different scales and displacements, and the wavelet detail coefficients are obtained under the different scales, which are inputted into the wavelet neural network to accomplish pattern classification during the network learning course. The PD signals, which are simulated with different PD signal sources in the lab, are de-noised and normalized. Using the power spectrum analysis method, figure out the temporal-scaling domain of the PD signals and figure out that of the wavelet function chosen, till the two pairs of parameters can be conformed, then the seating factors and displacement factors of the wavelet function, used as the structure parameters of the wavelet neural network, are taken as the basic frame of the improved wavelet neural network. The results indicate that the improved wavelet neural network has not only better identifying ability than that of the BP neural network and pattern features of the PD signals could be automatically extracted, but also the recognition precisions are higher than that of the other networks","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125336793","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

Enhanced partial discharge de-noising technique using eigen-decomposition 基于特征分解的增强局部放电降噪技术

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665315

T. Abdel-Galil, A. El-Hag, M. Salama, R. Bartnikas

引用次数: 2

New synthetic ester fluid for the insulation of liquid immersed transformers 液浸式变压器绝缘用新型合成酯液

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665374

B. Dolata, H. Borsi, E. Gockenbach

{"title":"New synthetic ester fluid for the insulation of liquid immersed transformers","authors":"B. Dolata, H. Borsi, E. Gockenbach","doi":"10.1109/ELINSL.2006.1665374","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665374","url":null,"abstract":"As mineral insulating oils as one of the key components of the insulation comprise several risks concerning aging, fire resistance and ecology, the use of ester liquids becomes increasingly attractive, moreover as the price of mineral oil based products continuously escalates. In this contribution a new ester insulating liquid is introduced, that combines the advantages of mineral insulating oils and ecological friendly, low viscosity synthetic liquids. Insulating liquids of mostly synthetic origin like high molecular weight hydrocarbons or silicone oils could so far not substitute mineral oils as their application characteristics are inferior or their price is disproportionate. In Europe only ester liquids, namely Midel 7131, have proven their advantageousness for transformers regarding environmental and aging aspects. The newly developed ester liquid, especially because of its low viscosity is a very promising liquid for use in transformers as cooling and insulation liquid. This contribution presents some experiments on the electrical, dielectrical, chemical and environmental characteristics of this liquid, which have been performed to approve the usability of this liquid for transformers","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122192524","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

An experiment to evaluate the benefits of processing aged transformer oil 对处理老化变压器油的效益进行了试验评价

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665264

P. M. Mitchinson, I. Hosier, P. Lewin, A. Vaughan, G.C. Chen, P. Jarman

{"title":"An experiment to evaluate the benefits of processing aged transformer oil","authors":"P. M. Mitchinson, I. Hosier, P. Lewin, A. Vaughan, G.C. Chen, P. Jarman","doi":"10.1109/ELINSL.2006.1665264","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665264","url":null,"abstract":"The mineral oil/paper insulating medium used in high voltage applications is subject to ageing through electrical, thermal and mechanical stresses. A significant factor in ageing is chemical action through moisture, metal contaminants and oxidation. The stresses change the properties of the paper and oil, which ages the insulation system. Transmission and distribution operators use condition monitoring and maintenance programs in an attempt to prolong the life of the insulation and hence the transmission equipment. Condition monitoring typically involves moisture analysis, dissolved gas analysis and furanic analysis of the oil. Maintenance involves purification of the oil to remove contaminants. Additional monitoring techniques may be used such as infra-red (IR) spectroscopy and dielectric analysis. However, without controlled ageing experiments under laboratory conditions the applicability of condition monitoring particularly for lifetime prediction is questionable. An opportunity arose from the recent scrapping of an aged high voltage transformer to analyze the diagnostic parameters of typical transformer oil aged under service conditions and compare these results with oil aged under control conditions. The aim is to understand the effects of reprocessing and ageing on some physical, chemical and dielectric properties. Some measurable properties of ageing and the benefits of oil maintenance are discussed in this paper","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114165722","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

Effect of size on electrical performance 尺寸对电气性能的影响

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Pub Date : 2006-06-11 DOI: 10.1109/ELINSL.2006.1665249

R. N. Hampton, A. Smedberg, D. Wald

{"title":"Effect of size on electrical performance","authors":"R. N. Hampton, A. Smedberg, D. Wald","doi":"10.1109/ELINSL.2006.1665249","DOIUrl":"https://doi.org/10.1109/ELINSL.2006.1665249","url":null,"abstract":"The electrical breakdown performance, either unaged or after ageing (laboratory or service), is often used as the basis for qualification of a device, design or material. Many of the features that affect these performance levels have been discussed in other documents; contaminants, propensity for water treeing, insulating and semiconducting materials. However the size of cable tested is rarely discussed. This is somewhat surprising as it has been long recognized that electrical failure is an extreme value (the Weibull distribution is a member of this family) or weakest link process. In extreme value processes the performance of the whole device is determined by the single \"weakest link\". Thus when more \"weak links\" are present the chance of failure is consequently higher: the measured performance depends on weak link concentration or size of the device. Additionally at some dimensions the thickness of the dielectric can influence the breakdown mechanism itself; especially if the thermal influences are present. This paper will attempt to discuss a number of these size related issues for both AC & impulse conditions; these will include: 1) the effect of the dielectric volume actual mechanism of failure, 2) prediction of performance on service length cables from short length laboratory tests. This has practical relevance on the selection of appropriate qualification levels which will have direct relevance to service performance, 3) the requirements for cable quality when increasing the size (thickness or length) installed","PeriodicalId":427638,"journal":{"name":"Conference Record of the 2006 IEEE International Symposium on Electrical Insulation","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124878601","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: 5