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European Transactions on Electrical Power最新文献

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Measurement of the electric power quality and related problems 电能质量的测量及相关问题
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450060607
A. Ferrero, A. Menchetti, R. Sasdelli
{"title":"Measurement of the electric power quality and related problems","authors":"A. Ferrero, A. Menchetti, R. Sasdelli","doi":"10.1002/ETEP.4450060607","DOIUrl":"https://doi.org/10.1002/ETEP.4450060607","url":null,"abstract":"Manufacturers, customers and the International Standards are paying more and more attention to the concept of quality of an industrial product. In particular the definition and measurement of the electric power quality is destined to become a big problem. Under sinusoidal, symmetric and balanced conditions, the power-quality problem is basically a loading quality problem; otherwise, it may be also a supplying quality problem. The paper discusses the measurement of some electric power-quality indices. It also considers the problem of separating the utility contribution to the power quality deterioration from the customer one.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450060607","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51090840","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: 45
A New Concept of Combined Transformers 组合变压器的新概念
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450060404
M. Poljak, Boris Bojanić, Tomislav Hafner, Josip Tomašević
{"title":"A New Concept of Combined Transformers","authors":"M. Poljak, Boris Bojanić, Tomislav Hafner, Josip Tomašević","doi":"10.1002/ETEP.4450060404","DOIUrl":"https://doi.org/10.1002/ETEP.4450060404","url":null,"abstract":"The basic characteristics of a new concept of combined transformers consisting of an inverse current transformer and a voltage transformer with open core, are described. The results of the research and testing of impulse and AC voltage distribution, accuracy class, influence of the current transformer on the voltage transformer and vice versa are given. Thanks to its technology and simplicity, the new concept allows the commercial manufacture of combined transformers for the highest equipment voltages up to 420 kV inclusive.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450060404","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51089665","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: 6
Dynamic, power‐quality‐oriented approach to power theory and compensation of asymmetrical systems under non‐sinusoidal conditions 非正弦条件下非对称系统的动态、功率质量导向的功率理论与补偿方法
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450040505
L. Czarnecki
{"title":"Dynamic, power‐quality‐oriented approach to power theory and compensation of asymmetrical systems under non‐sinusoidal conditions","authors":"L. Czarnecki","doi":"10.1002/ETEP.4450040505","DOIUrl":"https://doi.org/10.1002/ETEP.4450040505","url":null,"abstract":"Current and power equations of three-phase circuits with unbalanced non-linear loads supplied from asymmetrical and non-sinusoidal voltage source are developed in the paper. It is suggested that the form of the power equations should be adjusted to the goal for which they are developed. Their form, which may be convenient for interpretation of power phenomena, may therefore differ from the one developed for studies on the supply and loading quality. Also it is shown that power properties of a circuit cannot be wholly determined in its static state. They can be determined, however, if the circuit response to the supply changes is observed. Such an observation and analysis of the circuit response are considered as a dynamic approach. It may provide a control algorithm for adaptive compensators.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450040505","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51084908","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: 11
About the concept of consumed life of electrical machine windings and its application 介绍了电机绕组消耗寿命的概念及其应用
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450080205
R. Busch
{"title":"About the concept of consumed life of electrical machine windings and its application","authors":"R. Busch","doi":"10.1002/ETEP.4450080205","DOIUrl":"https://doi.org/10.1002/ETEP.4450080205","url":null,"abstract":"In order to economize on electrical energy and materials a higher load of electrical motors is necessary. In this way it is possible that the motors operate above their rated power. Consequently, the rated temperature of the winding is exceeded and, therefore, its lifetime is shortened. For the description of the winding aging process the consumed life is an appropriate quantity. The meaning of this quantity is explained and its application is demonstrated.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450080205","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51095016","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
Electrode-fall voltages of SF6 and air arcs between electrodes of Fe, W, Cu-W, Cu and Ti in the current range from 10 A to 20 kA SF6的电极降电压和Fe、W、Cu-W、Cu和Ti电极之间的空气弧，电流范围为10 A ~ 20 kA
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450080206
Y. Yokomizu, T. Matsumura, R. Henmi, Y. Kito
{"title":"Electrode-fall voltages of SF6 and air arcs between electrodes of Fe, W, Cu-W, Cu and Ti in the current range from 10 A to 20 kA","authors":"Y. Yokomizu, T. Matsumura, R. Henmi, Y. Kito","doi":"10.1002/ETEP.4450080206","DOIUrl":"https://doi.org/10.1002/ETEP.4450080206","url":null,"abstract":"Measurements were made of the sum of cathode-fall and anode-fall voltages, i .e. electrode-fall voltage U fall for SF 6 and air arcs at a pressure of 0.1 MPa in a wide current range from 10 A to 20 kA. The arcs were burned between electrodes of iron, tungsten, copper-tungsten, copper and titanium. For each electrode, U fall at a given current was estimated as the arc voltage at the zero gap length between the electrodes, which was extrapolated from arc voltages measured in short gaps with lengths below 3 mm. The electrode-fall voltage U fall of the SF 6 arc proved to be 17.5 V, 13.8 V, 17.5 V, 17.5 V and 17.3 V for the Fe, W, Cu-W Cu and Ti electrodes, respectively. The electrode-fall voltage U fall was affected by the electrode material, while U fall of the air arc is almost the same as that of the SF 6 arc. It was also found that U fall of each arc at a given electrode was independent of current in the above range.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450080206","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51095181","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: 6
Cost-benefit evaluation of voltage conditioners installation in industrial and commercial power systems 工业和商业电力系统中电压调节器安装的成本效益评估
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450080603
S. Quaia, F. Tosato
{"title":"Cost-benefit evaluation of voltage conditioners installation in industrial and commercial power systems","authors":"S. Quaia, F. Tosato","doi":"10.1002/ETEP.4450080603","DOIUrl":"https://doi.org/10.1002/ETEP.4450080603","url":null,"abstract":"In industrial and commercial sectors, loads are becoming increasingly sensitive to brief supply voltage disturbances. As a consequence, today voltage dips have more impact than just a few years ago. Fast voltage conditioners, improving the load immunity characteristics and accordingly reducing the expected number of load interruptions or malfunctions due to supply voltage dips, can allow large cost savings. Different categories of voltage conditioners are existing today, ranging from energy-stored devices (like uninterruptible power supply) to no energy-stored devices (like static voltage booster). To reduce the effects of supply voltage dips on a given plant, usually several different possible arrangements must be investigated, depending on the conditioners type, size and bus location. To determine the optimal arrangement is not always immediate. A methodology based on the minimum revenue requirement (MRR) is proposed in the paper, and a numerical example is given as well.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450080603","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51098510","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
Voltage profile optimization as influenced by power‐system configuration 受电力系统配置影响的电压分布优化
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450080610
M. Abdel-Salam, M. El-Sadek, A. A. Ibrahim, A. Ahmed
{"title":"Voltage profile optimization as influenced by power‐system configuration","authors":"M. Abdel-Salam, M. El-Sadek, A. A. Ibrahim, A. Ahmed","doi":"10.1002/ETEP.4450080610","DOIUrl":"https://doi.org/10.1002/ETEP.4450080610","url":null,"abstract":"This paper extends a linear-programming optimization-based method proposed before for reactive-power scheduling using generator terminal voltages and reactive powers, transformer tap-settings and switchable reactive power sources as control variables. The system configuration following contingencies is considered - for the first time - as an additional control variable in the optimization-method. It is proposed to use all of tile possible modifications of system configuration by opening one or two lines simultaneously. For this to be accurately achieved, a technique was proposed for ranking the line outages, which is based on system losses obtained by AC and/or DC load-flow studies. The ranking agreed satisfactorily with the voltage-reactive power index used for contingency analysis in system security studies. Voltage stability is checked before and after optimum adjustment of the control variables and proved to be better after optimum adjustment.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450080610","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51098980","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
Load- and line identification in multi-phase systems: A compensation-oriented approach 多相系统的负荷和线路识别:一种面向补偿的方法
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450060602
P. Mattavelli, P. Tenti
{"title":"Load- and line identification in multi-phase systems: A compensation-oriented approach","authors":"P. Mattavelli, P. Tenti","doi":"10.1002/ETEP.4450060602","DOIUrl":"https://doi.org/10.1002/ETEP.4450060602","url":null,"abstract":"The approach presented in this paper relays on the identification of load parameters in terms ofpassive impedances. It is aimed to the evaluation of unbalanced and reactive currents of an n-phase system so as to allow load compensation by means of passive components. The paper discusses also an identification method of the line parameters, from which the maximum voltage distortion caused by an individual load can be estimated. This also results in an evaluation method of the power factor, which can be used for tariffation.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450060602","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51090851","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
Assessment of unbalance emission level produced by loads using the apparent power components 利用视在功率分量评估负载产生的不平衡排放水平
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450060603
J. G. Mayordomo, L. F. Beites, J. L. Gutierrez
{"title":"Assessment of unbalance emission level produced by loads using the apparent power components","authors":"J. G. Mayordomo, L. F. Beites, J. L. Gutierrez","doi":"10.1002/ETEP.4450060603","DOIUrl":"https://doi.org/10.1002/ETEP.4450060603","url":null,"abstract":"This paper proposes the application of the unbalanced fundamental power as a merit figure to establish a prediction method of the voltage unbalance emission levels produced by the connection of unbalanced loads. The total apparent power, as criterion for optimal compensation, is discussed when it is applied to loads which are sensitive to voltage unbalances such as generators and motors. The analysis of these aspects is made according to recommendations for voltage unbalances.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450060603","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51090933","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: 6
Steady‐state security prediction in presence of load uncertainty 负荷不确定性下的稳态安全预测
European Transactions on Electrical Power Pub Date : 2007-09-07 DOI: 10.1002/ETEP.4450080204
A. Testa, D. Menniti, C. Picardi, N. Sorrentino
{"title":"Steady‐state security prediction in presence of load uncertainty","authors":"A. Testa, D. Menniti, C. Picardi, N. Sorrentino","doi":"10.1002/ETEP.4450080204","DOIUrl":"https://doi.org/10.1002/ETEP.4450080204","url":null,"abstract":"An important problem in the Electrical Power System operation is the steady-state security prediction. In order to take into account the load uncertainty, in this paper the authors apply a Monte-Carlo method together with an opportune Security Index to evaluate in a preventive manner the probability to fall in insecure operating state, by determining the security index probability density function. For this aim, in a previous paper proposed by the authors, it has been possible to take advantage of an Artificial Neural Network, trained to evaluate the Security Index probability density function in presence of the optimal economical dispatching of the generation powers for the load forecast. In the present paper, a more complex scenario is considered where the security analysis can suggest to the dispatcher to determine also non-optimal economical operating conditions to improve security. So a new, more complex, organization of the Artificial Neural Network training stage, necessary in order to obtain increased generalization capacity in the production stage, has been considered. In the first part of the paper the used security index, the Monte-Carlo simulation and the neural network structure with its learning algorithm utilized by the authors for the particular problem are briefly recalled. Finally, a numerical application on a simple electrical test system is shown pointing out very encouraging results.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.4450080204","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51094942","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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