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RISS 인기검색어
- 검색키워드
- 저자 : Kamran Dawood (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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A New method for the Calculation of Leakage Reactance in Power Transformers
Kamran Dawood,Bora Alboyaci,Mehmet Aytac Cinar,Olus Sonmez 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.5
Transformers are one of the most precious elements of the electric power system. Stability and reliability of the electric power network mainly depend on the working of the transformer. Leakage reactance of the transformer is one of the important factors and accurate calculation of the leakage reactance is necessary for the transformer designers and electric distributors. Leakage reactance of the transformer depends on the geometry of the transformer. There are many different methods for the calculations of the leakage reactance however mostly are usable when the axial heights of the high voltage and low voltage windings are equal. When the axial heights of high voltage and low voltage windings are asymmetric most of the analytical methods are not reliable. In this study, a new analytical method is introduced for the calculation of the leakage reactance. Fourteen different transformers are investigated in this study and four of them are presented in this paper. The results of the new analytical method are compared with the experimental results. Other analytical and numerical methods are also compared with this new method. Results show that this method is more reliable and accurate as compared to the other analytical methods. The maximum relative error between shortcircuit test and proposed method for these fourteen transformers was less than 2.8%.
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A New method for the Calculation of Leakage Reactance in Power Transformers
Dawood, Kamran,Alboyaci, Bora,Cinar, Mehmet Aytac,Sonmez, Olus The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.5
Transformers are one of the most precious elements of the electric power system. Stability and reliability of the electric power network mainly depend on the working of the transformer. Leakage reactance of the transformer is one of the important factors and accurate calculation of the leakage reactance is necessary for the transformer designers and electric distributors. Leakage reactance of the transformer depends on the geometry of the transformer. There are many different methods for the calculations of the leakage reactance however mostly are usable when the axial heights of the high voltage and low voltage windings are equal. When the axial heights of high voltage and low voltage windings are asymmetric most of the analytical methods are not reliable. In this study, a new analytical method is introduced for the calculation of the leakage reactance. Fourteen different transformers are investigated in this study and four of them are presented in this paper. The results of the new analytical method are compared with the experimental results. Other analytical and numerical methods are also compared with this new method. Results show that this method is more reliable and accurate as compared to the other analytical methods. The maximum relative error between short-circuit test and proposed method for these fourteen transformers was less than 2.8%.
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Dawood Kamran,Kömürgöz Güven,Işik Fatih 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
Converter transformers are widely used in the electric transport system and it is crucial equipment for the rectifer unit of the transport’s tracking substations. Leakage reactance is a crucial criterion during the development of a converter transformer. Almost all of the analytical methods consider only the axial leakage fux density during the evaluation of the leakage reactance. Radial leakage fux density is neglected in the analytical methods. Neglecting the radial leakage fux density during the computation of the leakage reactance in the two-winding transformers and other power transformers does not signifcantly afect the results. However, in the case of the converter transformers, radial leakage fux density also needs to be fully considered. In some of the converter transformers; windings, core, insulation material, and other parts of the transformer are so complex that analytical methods are impossible or difcult to implement. Hence, any other method is needed to evaluate the diferent parameters of the transformer. The optimal selection of leakage reactance is an important parameter during the design of the converter transformer. Numerical computational methods are one of the most commonly used techniques to solve and analyse the complex models of transformers. To accurately compute the leakage reactance of the electric transport system transformer (traction transformer), a transient method is used, which considers the efect of the radial leakage fux density. A prototype converter transformer of the electric transport system has been developed to obtain the experimental results. A transient method results and prototype transformer results show excellent agreement and verify the correctness of the fnite element model. The results of the traditional analytical and magnetostatics fnite element analysis are also compared with the short-circuit experimental test.
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Danling Hu,Sijie Liao,Xue Chen,Jincao Du,Kamran Dawood,Sachin Chauhan,Chao Gao,Wei Li 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.7
A novel fluorescent probe TSA for the high selectivity of mercury (Hg2+) ion has been explored, which was obtained by two-step synthesis. Probe TSA was barely emissive in HEPES buffer. In the presence of Hg2+ ion, the dithioacetal unit in probe TSA was hydrolyzed to be formyl group, consequently causing the intense sky-blue emission via aggregation-induced emission and intramolecular charge transfer mechanisms. Moreover, probe TSA was potential to detect Hg2+ ion in dyeing wastewater and clay soil.
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