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Calculating leakage inductances of pancake windings in dry-type Traction transformers 干式牵引变压器烧饼绕组漏感的计算
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947963
D. Azizian, M. Vakilian, J. Faiz, M. Bigdeli
{"title":"Calculating leakage inductances of pancake windings in dry-type Traction transformers","authors":"D. Azizian, M. Vakilian, J. Faiz, M. Bigdeli","doi":"10.1109/ECTICON.2011.5947963","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947963","url":null,"abstract":"Calculating leakage inductances between windings of multi-winding Traction transformers is one of the most important schemes in design procedure. In this paper, analytical and finite element methods (FEM) have been introduced for electromagnetic modeling of traction transformers with four pancake split windings. Using these models, the leakage inductances between the split windings are calculated and the models have been validated with the help of experimental data gathered from a typical 4000kVA cast-resin dry-type transformer. Some reformations are employed to improve the FEM results and effects of these reformations on accuracy of the model are studied. Employing the validated models, the effects of middle yoke on the leakage inductances of split winding traction transformers are discussed in this paper.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123951011","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: 3
A new soft switching interleaved boost converter with high voltage gain 一种新型高增益软开关交错升压变换器
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947947
M. Delshad, Ehsan Shahri
{"title":"A new soft switching interleaved boost converter with high voltage gain","authors":"M. Delshad, Ehsan Shahri","doi":"10.1109/ECTICON.2011.5947947","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947947","url":null,"abstract":"This paper proposed a new soft switching interleave boost converter with high voltage gain. In this converter two switches operate under ZVS condition without adding any auxiliary switches. The flyback converters which connected to the output in series lead to high voltage gain and less voltage stress on the power devices. In this paper simulation results verify theoretical analysis.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128480378","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
Phase transitions and dielectric properties of lead-free Bi0.5K0.5TiO3 - BaTiO3 piezoelectric ceramics 无铅Bi0.5K0.5TiO3 - BaTiO3压电陶瓷的相变和介电性能
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947798
A. Ruangphanit, S. Niemcharoen, R. Muanghlua, A. Rerkratn
{"title":"Phase transitions and dielectric properties of lead-free Bi0.5K0.5TiO3 - BaTiO3 piezoelectric ceramics","authors":"A. Ruangphanit, S. Niemcharoen, R. Muanghlua, A. Rerkratn","doi":"10.1109/ECTICON.2011.5947798","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947798","url":null,"abstract":"Lead free piezoelectric ceramics of (1−x)Bi0.5K0.5TiO3 - xBaTiO3 (BKT - BT) were fabricated by the solid state reaction method with normal sintering. The influence of BT addition on the crystal structure, phase transition and dielectric properties was investigated. The crystal structure and ferroelectric phase transition were studied by X-ray diffraction (XRD) and dielectric measurements. The complete solid solution of BKT - BT was observed for all compositions. In XRD results, all compositions showed a single phase perovskite structure with tetragonal symmetry at room temperature. With increasing BT content, the separation between diffraction peaks corresponded to increasing tetragonality. The phase transition temperature of ferroelectric tetragonal - paraelectric cubic (TC) decreased with increasing BT content. As the amount of BT concentration increased, the ceramic became denser, and almost no porosity was finally obtained.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132954951","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
A modified UTD solution for an impedance cylinder surface 阻抗圆柱表面的改进UTD解
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947809
K. Phaebua, T. Lertwiriyaprapa, C. Phongcharoenpanich, P. Pathak
{"title":"A modified UTD solution for an impedance cylinder surface","authors":"K. Phaebua, T. Lertwiriyaprapa, C. Phongcharoenpanich, P. Pathak","doi":"10.1109/ECTICON.2011.5947809","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947809","url":null,"abstract":"This paper presents a modified uniform theory of diffraction (UTD) solution in 3D case for computing the electromagnetic (EM) field scattering from the impedance cylinder surface. The proposed solution based on the general 3D UTD solution for a smooth convex perfect electric conductor (PEC) scattering problem. Here, the Pekeris-integral function in the 3D UTD PEC solution is modified by using the impedance surface Pekeris-integral function and it is evalulated by using a numerical integration method without tabulated value. The modified UTD solution result shows good agreement when comparing with the exact solution and a commercial software. It is noted that this modified 3D UTD solution for a impedance cylinder surface will be very useful for predicting the field strength in the scenario modeling of the radio wave propagation","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131845893","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
Quasi-Orthogonal Space-Time-Coded protocol for eight-user cooperative communications 八用户协同通信的准正交空时编码协议
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947858
Phatcharaporn Phenpakkool, Nikorn Sutthisagiam, C. Pirak
{"title":"Quasi-Orthogonal Space-Time-Coded protocol for eight-user cooperative communications","authors":"Phatcharaporn Phenpakkool, Nikorn Sutthisagiam, C. Pirak","doi":"10.1109/ECTICON.2011.5947858","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947858","url":null,"abstract":"In this paper, we investigate a Quasi-Orthogonal Space-Time Block Coded (QO-STBC) protocol with relay selection in the eight-user cooperative communication environment. The QO-STBC coded protocol could provide a full rate and a full diversity to cooperative communications. Computer simulation results show that QO-STBC coded protocol yields 3-dB lower probability of error compared with a conventional decode- and-forward protocol.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132320437","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
Transmission system congestion alleviation with consideration of bilateral contracts 考虑双边合同的输电系统拥堵缓解
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947965
Yukholthorn Bunterng, K. Audomvongseree
{"title":"Transmission system congestion alleviation with consideration of bilateral contracts","authors":"Yukholthorn Bunterng, K. Audomvongseree","doi":"10.1109/ECTICON.2011.5947965","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947965","url":null,"abstract":"This paper proposes a transmission congestion management by load shedding scheme altogether with adjustment of the transformer's tap in the bilateral contract market. In this paper, it is assumed that an independent system operator (ISO) controls all transactions occurring in the system. It can curtail some transactions in case there exists a congestion problem in the power system, either voltage level violation or line overload. In the bilateral market, there is a special characteristic that is different from typical other power systems. When ISO curtails load, at the same time, it must consider reducing the generation of that transaction at the same amount. The proposed transmission congestion management method is based on the linearization and the quadratic programming techniques. It has been tested with the IEEE-RTS79 system. Satisfactory results were obtained.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126632667","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
Performance analysis of polycrystalline silicon and thin film amorphous silicon solar cells installed in Thailand by using simulation software 利用仿真软件对泰国安装的多晶硅和薄膜非晶硅太阳能电池进行性能分析
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947917
Anucha Phowan, P. Sripadungtham, A. Limmanee, E. Hattha
{"title":"Performance analysis of polycrystalline silicon and thin film amorphous silicon solar cells installed in Thailand by using simulation software","authors":"Anucha Phowan, P. Sripadungtham, A. Limmanee, E. Hattha","doi":"10.1109/ECTICON.2011.5947917","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947917","url":null,"abstract":"This paper presented performance analysis of solar cells and PVSYST simulation software of polycrystalline silicon and thin film amorphous silicon solar cells under Thailand conditions. The results indicated that performance result based on IEC 61724 standards (Photovoltaic System Performance Monitoring-Guidelines for Measurement, Data Exchange and Analysis) [1] found the average net energy from array (EA,τ) was 11.23 kWh/day. The array yield (YA) was 4.36 h/d and the performance ratio (PR) was 92.54% for Poly-Si solar cells. And the average net energy from array (EA,τ) was 4.22 kWh/day. The array yield (YA) was 4.65 h/d and the performance ratio (PR) was 103.86% for a-Si solar cells. The electrical power of polycrystalline silicon solar cells, the estimated values and the measured values were differed by 4.22% and 17.54% for thin film amorphous silicon solar cells. After applying correction factor based on the relationship of PR, the differed values improve to 10.60%.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126661766","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
Analysis of electrical and thermal characteristics of gapless metal oxide arresters using thermal images 用热图像分析无间隙金属氧化物避雷器的电学和热特性
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947930
Chaleamchon Srisukkhom, P. Jirapong
{"title":"Analysis of electrical and thermal characteristics of gapless metal oxide arresters using thermal images","authors":"Chaleamchon Srisukkhom, P. Jirapong","doi":"10.1109/ECTICON.2011.5947930","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947930","url":null,"abstract":"This paper presents the electrical and thermal characteristics of distribution class - metal oxide varistor (MOV) under power frequency AC voltage changes. The leakage currents of MOV arresters are measured over a period of time against 1.0 – 2.0 p.u. of system voltage. For the experimental study, the thermal runaway property of MOV is closely related to the temperature limit which depends on the heat generation and dissipation. As the leakage current is 0.16 mA, heat generation is lower than heat dissipation. In the other hand, as the leakage current is 0.31, 0.6, and 0.8 mA, heat generation is greater than heat dissipation. The appearing of temperature distribution is observed by thermal image from thermography camera. The correlations between the electrical and thermal characteristics of MOV from the thermal image are analyzed using image processing. The developed image processing model could be used to estimate leakage current and maximum temperature of the MOV arresters.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126703708","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
A multilevel converter charger utilizing superimposed pulse frequency method for prolonging lead-acid battery lifetime 一种利用叠加脉冲频率法延长铅酸电池寿命的多电平变换器充电器
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5947953
Thouchapol Jiramoree, P. Paisuwanna, S. Khomfoi
{"title":"A multilevel converter charger utilizing superimposed pulse frequency method for prolonging lead-acid battery lifetime","authors":"Thouchapol Jiramoree, P. Paisuwanna, S. Khomfoi","doi":"10.1109/ECTICON.2011.5947953","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5947953","url":null,"abstract":"A multilevel converter charger using superimposed pulse frequency technique for prolonging lead-acid battery lifetime is developed in this paper. The proposed state of charge is divided to three states: superimposed pulse frequency charge (SPF), Constant current charge (CC) and Constant voltage charge (CV). SPF is charging state for rejuvenating a deteriorated battery due to sulfation at the plates. In this state, the pulse frequency of voltage output will vary from 10 kHz to 20 kHz to scan for mechanical resonance. A dc to dc multilevel converter is applied to generate the superimposed pulse frequency. The mechanical resonance at the plates and the sulfation reasons are also studied. The simulation and experiment are also validated the proposed charging technique. The simulation and experimental results suggest that the proposed multilevel converter charger can rejuvenate the voltage terminal of the battery even though the voltage terminal falling under 10% of SOC which is normally considering as a worn-out battery. Also, the charging efficiency would improve by using proposed charging technique with a combination of three states of charge.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122218523","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
Human identification using main loop of the VCG contour 人体识别利用主回路的VCG轮廓
The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 Pub Date : 2011-05-17 DOI: 10.1109/ECTICON.2011.5948014
M. Medhat, Tawfik Abdelraheem
{"title":"Human identification using main loop of the VCG contour","authors":"M. Medhat, Tawfik Abdelraheem","doi":"10.1109/ECTICON.2011.5948014","DOIUrl":"https://doi.org/10.1109/ECTICON.2011.5948014","url":null,"abstract":"In this paper the possibility of using the VCG “Vectorcardiograph” main loop for Biometrics identification is investigated. A test set of 550 VCG contours recorded from 22 healthy individuals measured at different times are used to validate the system. The proposed system uses only the main loop of the VCG contour for identification. Two different algorithms are used. In the first one selected Fourier Descriptor coefficients of the main loop of the VCG are used as biometric data. In the second method coefficients from specially developed descriptor are used for identification. In both methods Feed Forward Neural Networks are used as classifiers giving an identification rate ranging from 95% to 99.45%.","PeriodicalId":123701,"journal":{"name":"The 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011","volume":"93 14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126039714","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
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