2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)最新文献

Aspects interpreting PILC cables' diagnostic parameters measured at different test voltage frequencies 解释在不同测试电压频率下测得的PILC电缆诊断参数的几个方面

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526028

F. Eppelein, C. Weindl

{"title":"Aspects interpreting PILC cables' diagnostic parameters measured at different test voltage frequencies","authors":"F. Eppelein, C. Weindl","doi":"10.1109/DIAGNOSTIKA.2018.8526028","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526028","url":null,"abstract":"Medium voltage cables with oil impregnated paper insulation are still to be found numerously in many distribution grids. Many of these cable lines have been installed dozens of years ago, so there is a strong interest in getting an overview on the condition of the insulation of these cables. For this purpose, a long lasting aging experiment has been performed in the laboratory, where multiple cables of all kinds of different service histories have been artificially aged in an accelerated way by means of thermal and electrical stresses and combinations of these. During this process, the diagnostic parameters like dissipation factor and partial discharges have been continuously recorded at power frequency (50 Hz). The gathered data from the laboratory experiment serves as basis for field measurements, which are being carried out. The necessary measurement equipment has been engineered and integrated in a cable test van. This consists of two different voltage sources (50 Hz and 0.1 Hz), a measurement unit on top of a high voltage divider and a computer based control and data acquisition system. A correlation of these two measurements promises enhanced diagnostic relevance for the condition assessment of medium voltage networks. Based on numerous field measurements carried out in the local distribution network, new approaches in the correlation of measurements at two different frequencies of test voltages are to be created. This includes a reference to other already well established methods. However, the reference to other methods needs to be verified in a more detailed way.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125002455","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

Autours Index 围绕索引

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/diagnostika.2018.8526032

引用次数: 0

Requirements of a system for the artificial ageing of paper insulated lead covered medium voltage cables 纸绝缘铅包中压电缆人工老化系统的要求

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526128

Ann-Catrin Müller, C. Weindl, J. Linossier, J. Schramm, L. Benkert

{"title":"Requirements of a system for the artificial ageing of paper insulated lead covered medium voltage cables","authors":"Ann-Catrin Müller, C. Weindl, J. Linossier, J. Schramm, L. Benkert","doi":"10.1109/DIAGNOSTIKA.2018.8526128","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526128","url":null,"abstract":"A higher percentage of the electrical distribution grid in Germany is still working with the elderly paper insulated lead covered (PILC) cables. For a cost-efficient asset-management of electrical grids, the status and remaining lifetime of electrical equipment is of highest interest. Diagnostic systems on the market do not deliver a significant and detailed information about the ageing status. Due to this fact, a longer lasting project is set up with the goal to artificially age, analyse and diagnose the ageing behaviour of PILC MV-cables. The general task of the accelerated ageing system is to apply enforced stress conditions to selected test cables out of field operation. In this way, defined artificial and accelerated ageing conditions are generated to provoke faster but realistic ageing processes. The characteristic diagnostic values are regularly acquired by a specific automatized measurement and control system together with necessary additional data, like e.g. temperatures, applied voltages and currents, which are controlled by sensors. In the article the methods, the design and the key values for the projection of the system will be presented. Using this approach, it is possible to simulate the ageing of field equipment during its operation over several decades within an experimental time span of several months.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"57 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116515956","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

Study on the trap properties of nano-ZnO modified polyimide based on surface potential decay method 基于表面电位衰减法的纳米zno修饰聚酰亚胺的阱特性研究

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526134

Bo Zhang, Jiang Wu, Xiaoquan Zheng

{"title":"Study on the trap properties of nano-ZnO modified polyimide based on surface potential decay method","authors":"Bo Zhang, Jiang Wu, Xiaoquan Zheng","doi":"10.1109/DIAGNOSTIKA.2018.8526134","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526134","url":null,"abstract":"The space environment will charge the surface of the spacecraft. Due to the low discharge ability of the dielectric material, it may cause the surface discharge of the spacecraft and affect the normal work of the spacecraft. Polyimide is a typical dielectric material on the spacecraft, this paper attempts to improve the surface discharge ability by modifying polyimide with nano-ZnO. The research method is based on the surface potential decay platform, which is an intuitive approach to evaluate the states of surface charging. The surface potential decay characteristics of pure polyimide and its modified samples are tested. The surface potential decay mechanism of the dielectric is analyzed by calculating the trap characteristics. Results show that the surface potential of ZnO modified polyimide has less decrement and rate of decay than that of the pure polyimide. The deep trap density of electron trap and hole trap density is less than that of pure polyimide, the shallow trap of pure polyimide is the lowest. The change of electron trap level is small, while the hole trap level increases.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122087455","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

Diagnostics of the $Fe$-based soft magnetics composites using active thermography 利用主动热成像技术诊断铁基软磁复合材料

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526135

S. Dudzik, A. Jakubas

引用次数: 2

Influence of Thermal Degradation on the Dielectric Properties of Polymer Composites 热降解对聚合物复合材料介电性能的影响

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526137

O. Michal, V. Mentlík

引用次数: 1

Novel Approaches of DGA to Transformers Filled with Natural Ester Based Insulating Oils 天然酯基绝缘油填充变压器的DGA新方法

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526095

Jian Li, Jinghan Zhou, Chenmeng Xiang, Zhengyong Huang, Jianfeng He, M. A. Mehmood

{"title":"Novel Approaches of DGA to Transformers Filled with Natural Ester Based Insulating Oils","authors":"Jian Li, Jinghan Zhou, Chenmeng Xiang, Zhengyong Huang, Jianfeng He, M. A. Mehmood","doi":"10.1109/DIAGNOSTIKA.2018.8526095","DOIUrl":"https://doi.org/10.1109/DIAGNOSTIKA.2018.8526095","url":null,"abstract":"Vegetable insulating oils have different chemical compositions as compared to mineral oils, hence, dissolved gas characteristics under thermal and electrical faults have differences, thus fault diagnostic methods based on Dissolved gas analysis (DGA) used for mineral oil-filled transformers cannot be used to investigate vegetable oil-filled transformers. This paper presents experimental results of dissolved gases in the camellia insulating oil under typical thermal and electrical faults in transformers. The thermal fault simulation experiments include low temperature, medium temperature and high temperature, and the electrical fault simulation experiments include partial, breakdown and arc discharges. Experimental results show that except CO and CO<inf>2</inf>, H<inf>2</inf> and C<inf>2</inf>H<inf>6</inf> were main characteristic gases under thermal faults, the percentage contents of H<inf>2</inf> decreases while CH<inf>4</inf>, C<inf>2</inf>H<inf>4</inf> and C<inf>2</inf>H<inf>6</inf> increases with the temperature increase. In addition, H<inf>2</inf> and CH<inf>4</inf> were main characteristic gases under partial discharge faults, C<inf>2</inf>H<inf>2</inf> was the main characteristic gas under breakdown faults, and C<inf>2</inf>H<inf>2</inf> and C<inf>2</inf>H<inf>4</inf> were main characteristic gases under arc discharge faults. Characteristic parameters were extracted based on DGA, and fault diagnostic methods of camellia insulating oil-filled transformer were proposed, including graphic diagnostic method and none code diagnostic method. Results showed that faults could be effectively analyzed by triangle and pentagon diagnostic methods as well as none code diagnostic method. H<inf>2</inf>, C<inf>2</inf>H<inf>4</inf>, C<inf>2</inf>H<inf>2</inf>&H<inf>2</inf>, CH<inf>4</inf>, C<inf>2</inf>H<inf>6</inf> Triangle method and none code diagnostic method are better fault diagnostic methods for camellia insulating oil.","PeriodicalId":211666,"journal":{"name":"2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130258934","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

Stator current and axial magnetic flux analysis of induction motor 感应电动机定子电流和轴向磁通分析

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526025

Jan Fulnečck, S. Mišák

引用次数: 6

A High-Frequency Simulation Model of a MV Cable Joint 中压电缆接头的高频仿真模型

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526026

T. Maier, D. Lick, T. Leibfried

引用次数: 9

Changes of Electrical Properties of Coaxial Cables Exposed to Gamma-irradiation 辐照对同轴电缆电性能的影响

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2018-09-01 DOI: 10.1109/DIAGNOSTIKA.2018.8526027

Z. Konečná, P. Žák

引用次数: 2