2020 IEEE Electrical Insulation Conference (EIC)最新文献_第5页

Study on Breaking Characteristics of SF6/N2 Gas Mixtures GIS Disconnecting Switch SF6/N2混合气体GIS断路开关断路特性研究

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158678

Min Zhang, Ran Zhang, M. Jin, Zhibing Li, Rui Zhang, Bin Lyu, Tao Wen

{"title":"Study on Breaking Characteristics of SF6/N2 Gas Mixtures GIS Disconnecting Switch","authors":"Min Zhang, Ran Zhang, M. Jin, Zhibing Li, Rui Zhang, Bin Lyu, Tao Wen","doi":"10.1109/eic47619.2020.9158678","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158678","url":null,"abstract":"SF6/N2 mixed gas, as a typical binary mixed gas with synergistic effect, is a simple and effective SF6 environmental protection measure. It has been gradually applied to gas-insulated power equipment such as GIS. In order to develop a mixed-gas 126 kV GIS disconnecting switch, breaking characteristics under typical operation conditions are carried out. A circuit breaking test for bus-transfor current was established, and a bus-transfor current breaking test was carried out. It was found that under different conditions, the arc time of the mixed gas was significantly longer than that of SF6. Under the condition of 30V/1600A, the arc time of 28% mixed gas is increased by about 29% compared with SF6. The arcing time of the mixed gas with 40% mixing ratio is similar. The arcing time will increase when the gas pressure decreases. The operation speed of the disconnecting switch has a small effect on the breaking. After 100 tests, the contactor was slightly ablated after the 30V/1600A test but still passed the test. However, the contactor was severely ablated under the 100V/1600A breaking condition and failed the test. A small capacitive current breaking test circuit was set up, and a small capacitive current breaking test was carried out. It is found that the mixing ratio, gas pressure, and switching operation speed have the same effect on the arcing time as the bus-transfor current breaking test. Compared with SF6, the breaking performance is significantly reduced. The arcing time of 28% mixed gas in the 126kV test is increased by about 25%. No insulation discharge occurred after 50 tests, and it was judged that the test passed. In summary, the breaking performance of the mixed gas is significantly lower than SF6, which will make the arcing time and the contactor ablation increase, and even the breaking failure. An improved method of adding copper-tungsten arcing contactor was proposed, after which the test sample was improved, and the type test was passed.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133391541","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

LCA and Smoke Test of Dielectric Fluids Based on Natural Esters 基于天然酯的介电流体LCA及发烟试验

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158755

F. Scatiggio, Erika Breda, L. Calcara, Giorgio Campi, Lara Parodi, Riccardo Pedriali, M. Pompili, Angela Santoro

引用次数: 1

Comparison of Different Simulating Calculation Methods for Electric Fields Along the Stator End-winding of HV Rotating Machine 高压旋转电机定子端部电场不同模拟计算方法的比较

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/EIC47619.2020.9158676

Ping Liu, Xuezhong Liu, Yue Zhang, Bo Hu, Zhiming Liang

{"title":"Comparison of Different Simulating Calculation Methods for Electric Fields Along the Stator End-winding of HV Rotating Machine","authors":"Ping Liu, Xuezhong Liu, Yue Zhang, Bo Hu, Zhiming Liang","doi":"10.1109/EIC47619.2020.9158676","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158676","url":null,"abstract":"The stress grading (SG) system is the important structure of stator end-winding of high voltage (HV) rotating machine, whose performance is closely related to the safe operation of HV rotating machine. How to evaluate the performance of the SG system is vital and helpful to the design and optimization of SG system. In this paper, the available numerical calculation methods, including conventional pi-type equivalent circuit method (PECM), complex reticular equivalent circuit method (CECM), and finite element method (FEM), were described. And the comparative analyses were made based on the potential and electric field distribution along the three-segment stress grading coating (SGC) of a rated 24kV class hydro-generator, which is obtained from three calculation methods. The results showed that three methods all could be applied to evaluate the performance of the SG system, but the complex reticular equivalent circuit method and finite element method are in agreement with each other and should be more suitable for the optimization design of the SG system of HV rotating machine.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127650692","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

Dielectric Dissipation factor measurements on stator insulation - results from a global survey 定子绝缘的介电损耗系数测量——来自全球调查的结果

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158740

M. Krieg-Wezelenburg

引用次数: 1

A Space Charge Measurement Method of XLPE Based on Polarization and Depolarization Current 基于极化和退极化电流的XLPE空间电荷测量方法

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158581

Siyan Lin, K. Zhou, Mingzhi Li

引用次数: 2

Condition Evaluation Method of Cable Based on the Growth of Electrical Tree 基于电气树生长的电缆状态评价方法

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158708

Wenxiang Xue, Yi Lu, Yanfeng Gao, Yangchun Cheng, Li Zhao, Yibo Zheng, Dangguo Xu

{"title":"Condition Evaluation Method of Cable Based on the Growth of Electrical Tree","authors":"Wenxiang Xue, Yi Lu, Yanfeng Gao, Yangchun Cheng, Li Zhao, Yibo Zheng, Dangguo Xu","doi":"10.1109/eic47619.2020.9158708","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158708","url":null,"abstract":"The diagnosis of XLPE cable lines by partial discharge (PD) has always been a key technical issue. As an important parameter reflecting the insulation status of XLPE cable equipment, partial discharge is closely related to its insulation status. A state evaluation method of cable based on the growth of electrical tree is proposed in this paper, which can realize the quantitative evaluation of cable state. Based on the energy conservation law of electrical tree growth in molecular thermodynamics, the relationship between local discharge signal and electrical tree length in cable insulation is studied. In order to evaluate the insulation condition of a cable element, the partial discharge failure probability of the cable element is solved by using the electrical tree length index according to the stress-strength interference theory in the field of mechanical reliability. In addition, a partial discharge test of 10kV XLPE cable is performed. The data on partial discharge and the growth process of the electrical tree are recorded. By substituting the proposed model for calculating the probability of cable partial discharge faults, the effectiveness of the proposed method in evaluating cable status is verified.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115399556","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

Comparison of gases generated in mineral oil and natural ester immersed transformer's models 矿物油和天然酯浸式变压器模型的气体生成比较

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158578

M. Meira, R. Álvarez, C. Verucchi, Leonardo J. Catalano, C. Ruschetti

{"title":"Comparison of gases generated in mineral oil and natural ester immersed transformer's models","authors":"M. Meira, R. Álvarez, C. Verucchi, Leonardo J. Catalano, C. Ruschetti","doi":"10.1109/eic47619.2020.9158578","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158578","url":null,"abstract":"Currently, the use of natural esters in transformers is increasing, from distribution transformers to power transformers. However, its application in power transformers is still limited by the low evaluation in service. Diagnostic tests of the condition of power transformers must be reviewed for whether they need modifications to their interpretation criteria, mainly in those tests carried out on the transformer's dielectric fluid. The dissolved gas analysis (DGA) interpretation criteria should be investigated since, although it has been shown that the types of fault gases are similar from each of the different fluids, for a given fault, the amounts and ratios of the gases may differ from fluid to fluid. Moreover, from the review of the reported research, it was observed that most of the results obtained are from laboratory scale test and also, they are somewhat dependant of the set-up used. This paper presents a case study of thermal faults model for different hot spot temperatures. The fault model was made using two kinds of oils: mineral and a natural ester, both without cellulose. A comparative study between mineral oil and natural ester oils based on DGA were done, identifying key gases for the different faults types and fluids. Both fluids were to be used to impregnate MV transformer windings by a manufacturer. Traditional mineral oil DGA interpretation techniques were tested on natural ester, such as Rogers ratio and Doernenburg ratio from IEEE Std C57.104:2008 and IEC ratio and Duval triangle from IEC 60599:2015. In addition, Duval triangle for non-mineral oils was also tested.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115617967","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

Frequency Response Curves of Windings with Bulge Deformation in Power Transformers 电力变压器鼓形变形绕组的频响曲线

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158677

Danyang Zheng, Feifei Sun, J. Bi, G. Ding, Yangchun Cheng

引用次数: 2

Influence of Water Content in Natural Ester Liquids Partial Discharge Inception Voltage 天然酯类液体中含水量对局部放电起始电压的影响

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/eic47619.2020.9158736

L. Calcara, K. Rapp, S. Sangiovanni, M. Pompili, A. Sbravati

{"title":"Influence of Water Content in Natural Ester Liquids Partial Discharge Inception Voltage","authors":"L. Calcara, K. Rapp, S. Sangiovanni, M. Pompili, A. Sbravati","doi":"10.1109/eic47619.2020.9158736","DOIUrl":"https://doi.org/10.1109/eic47619.2020.9158736","url":null,"abstract":"The use of natural ester liquids in power transformers, as an alternative to mineral oils, is increasing in the last decades due to the higher interest in reducing the environmental and fire risks. This is possible thanks to the fact that natural ester liquids present much higher flash & fire points and biodegradability, also satisfying the general principles of a circular economy. Furthermore, their diathermic properties are completely comparable with those of mineral oils and this, if the active part is properly designed, may allow more efficient cooling with a consequent increase in specific power, especially in temporary overload conditions. Also, the electrical properties of mineral oils and natural ester liquids may be considered comparable, especially in terms of AC breakdown voltage and partial discharge behavior when testing these insulating liquids according to standardized methods. The breakdown voltage (IEC 60156) and partial discharges determination (IEC 61294TR) at power frequency are test procedures mainly intended to indicate the presence of contaminants such as water and suspended solid particles. Nowadays, being in progress the preparation of an ASTM Project WK65707 on PD detection in dielectric liquids and being envisaged the revision of the existing Technical Report IEC 61294 TR, in this paper are reported some considerations concerning the influence of different water contents on Partial Discharge Inception Voltage (PDIV) of one commercial natural ester liquid and a traditional mineral oil.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124745883","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

Ageing study in aircraft electromechanical chain: systems modeling for property evolution monitoring 飞机机电链老化研究:基于性能演化监测的系统建模

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI: 10.1109/EIC47619.2020.9158659

S. Pin, G. Bélijar, L. Fetouhi, Leroy Somer, C. Van de Steen, L. Albert

{"title":"Ageing study in aircraft electromechanical chain: systems modeling for property evolution monitoring","authors":"S. Pin, G. Bélijar, L. Fetouhi, Leroy Somer, C. Van de Steen, L. Albert","doi":"10.1109/EIC47619.2020.9158659","DOIUrl":"https://doi.org/10.1109/EIC47619.2020.9158659","url":null,"abstract":"The evolution toward more electric aircraft and hybrid propulsion aircraft imply increasing power on board, hence more severe constraints on the elements of aircraft electromechanical chain. High voltages associated with low pressure environment at high altitude, increase the risk of partial discharge occurrence. This risk becomes even higher when operating temperature and thermal variations can have an impact on the insulating properties of materials over time. To avoid premature failure, ageing mechanisms are currently under characterization in the framework of the HighVolt project at IRT Saint Exupéry, A large ageing campaign has started on different representative specimens of several sub-systems of an aircraft electromechanical chain. More particularly a stator-like test vehicle called motorette has been improved and placed under isothermal ageing for lifetime characterization. This paper presents the work achieved to get a highly repetitive winded test vehicles and its digital model twin in COMSOL to enhance failure mechanisms comprehension by correlating a set of monitored parameter. Capacitance and Partial Discharge Inception Voltage are first measured experimentally and then computed numerically to be compared. As a further work, the parameters drift will be studied by modifying the models according to the supposed ageing mechanism and comparing with experimental data.","PeriodicalId":286019,"journal":{"name":"2020 IEEE Electrical Insulation Conference (EIC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124790234","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