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Journal of the Institution of Electrical Engineers - Part I: General最新文献

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A computer for use in power-system transient stability studies 一种用于电力系统暂态稳定性研究的计算机
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-12-01 DOI: 10.1049/JI-1.1948.0199
J. Mortlock
{"title":"A computer for use in power-system transient stability studies","authors":"J. Mortlock","doi":"10.1049/JI-1.1948.0199","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0199","url":null,"abstract":"The transient stability limits of power systems are determined by assuming conditions to be constant over short intervals of time and using the results obtained at the end of one interval to vary the conditions at the beginning of the next interval. The analysis is tedious and it is easy to make numerical errors. If a large number of machines is involved, it is essential to use an a.c. network analyser for determining the values of power to be used for the different time intervals, but there is no reduction in the computation labour, and in practice the greater part of the time taken for a study is devoted to the latter. To reduce the computation time and the possibility of numerical errors, the ?step? evaluations can be carried out semi-automatically by using the computer described. Furthermore, by reducing the time interval, greater accuracy can be obtained without an increase in overall time as compared with normal procedure.","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128121199","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
Corrigendum: The alternating-current resistance of hollow, square conductors 勘误:空心方形导体的交流电阻
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-12-01 DOI: 10.1049/JI-1.1948.0211
A. Arnold
{"title":"Corrigendum: The alternating-current resistance of hollow, square conductors","authors":"A. Arnold","doi":"10.1049/JI-1.1948.0211","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0211","url":null,"abstract":"","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134484092","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
Magnetic materials. A review of progress 磁性材料。进展回顾
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-12-01 DOI: 10.1049/JI-1.1948.0195
F. Brailsford, D. Oliver, D. Hadfield, G. R. Polgreen
{"title":"Magnetic materials. A review of progress","authors":"F. Brailsford, D. Oliver, D. Hadfield, G. R. Polgreen","doi":"10.1049/JI-1.1948.0195","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0195","url":null,"abstract":"The development of the theory of ferromagnetism over the past two or three decades is briefly reviewed and some of the more outstanding relevant laboratory investigations are discussed, including work on the effect of impurities, the magnetic properties of single crystals, on hydrogen anealing and on heat-treatment in a magnetic field. The development and properties of the cold-rolled silicon steels for transformers are then reviewed, as well as advances in the hot-rolled steels. Cobalt-iron alloys with magnetic saturation values higher than for iron are discussed. Finally, the development of the nickel-iron alloys is traced, concluding with the most recent advance in this field.","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123624303","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
Great Personalities in the Fields of Electrical and Magnetic Measurements 电与磁测量领域的伟大人物
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-11-01 DOI: 10.1049/JI-1.1948.0188
J. T. Macgregor-Morris
{"title":"Great Personalities in the Fields of Electrical and Magnetic Measurements","authors":"J. T. Macgregor-Morris","doi":"10.1049/JI-1.1948.0188","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0188","url":null,"abstract":"","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133289460","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
The economic utilization of electricity in Great Britain 英国电力的经济利用
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-11-01 DOI: 10.1049/JI-1.1948.0181
R. B. Giles
{"title":"The economic utilization of electricity in Great Britain","authors":"R. B. Giles","doi":"10.1049/JI-1.1948.0181","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0181","url":null,"abstract":"The paper considers the application and cost of electricity in this country, with the economical use of raw fuel. It is pointed out that the development of low prices per kilowatt-hour to encourage an improved load factor has had no regard for economy in the use of coal, a matter which is now vital to the nation, and that heat units are of greater importance than artificial monetary values. The paper covers a wide field, with the object of provoking consideration of all aspects of the use of electricity, and generally no attempt has been made to develop closely detailed arguments. The application of the electric drive in industry is criticized. Tables are provided to indicate the wasteful use of motors, and proposals are made for effecting the necessary improvements. The integration of electrical generation with other forms of energy is briefly considered. The possibility of providing a cheap supply of energy for electrolytic and electrochemical processes from a coal-fired station is considered, and the author concludes that in certain circumstances the cost could be brought within the limits regarded as essential by those industries.","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121752183","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
The author's reply to the discussion "The design and construction of a new electron microscope" 作者对“一种新型电子显微镜的设计与构造”讨论的答复
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-11-01 DOI: 10.1049/JI-1.1948.0187
M. E. Haine
{"title":"The author's reply to the discussion \"The design and construction of a new electron microscope\"","authors":"M. E. Haine","doi":"10.1049/JI-1.1948.0187","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0187","url":null,"abstract":"","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125946305","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
Polarization phenomena in nickel-iron alloys, and their effective elimination 镍铁合金中的极化现象及其有效消除
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-10-01 DOI: 10.1049/JI-1.1948.0177
O. Butler
{"title":"Polarization phenomena in nickel-iron alloys, and their effective elimination","authors":"O. Butler","doi":"10.1049/JI-1.1948.0177","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0177","url":null,"abstract":"The mathematical results of Butler and Mangl are utilized to determine the distribution of the flux density in ferromagnetic laminae at various instants. The manner in which the phenomenon of polarization in opposite directions occurs at the outer and inner parts of nickel-iron laminae is clearly demonstrated for power-and audio-frequency operation.The mathematics is extended to enable the distribution of harmonic magnetization in the laminae to be determined. It is shown that harmonic magnetization occurs in the laminae even when the total flux does not contain harmonics.The calculated results afford an explanation of the difficulties encountered in attempts to demagnetize nickel-iron alloys completely, and assist the development of a reliable method of demagnetization. It is shown that methods that have been applied successfully to silicon-iron alloys, and tacitly accepted for nickel-iron alloys, possess inherent defects in the latter case.","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126376970","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
The Electrical Equipment of Automobiles. A Review of Progress 汽车电气设备。进展回顾
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-10-01 DOI: 10.1049/JI-1.1948.0171
E. A. Watson
{"title":"The Electrical Equipment of Automobiles. A Review of Progress","authors":"E. A. Watson","doi":"10.1049/JI-1.1948.0171","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0171","url":null,"abstract":"","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130365142","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
Some aspects of the theory of iron-testing by wattmeter and bridge methods 电表法和电桥法测铁原理的几个方面
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-10-01 DOI: 10.1049/JI-1.1948.0164
N. Astbury
{"title":"Some aspects of the theory of iron-testing by wattmeter and bridge methods","authors":"N. Astbury","doi":"10.1049/JI-1.1948.0164","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0164","url":null,"abstract":"The paper, which is an attempt to survey the present position, opens with a discussion of the limitations of the dynamometer wattmeter. Compensation for voltage circuit phase angle and for eddy current and voltage circuit losses is discussed. The effect of the iron circuit is noted, the influence of leakage flux being pointed out. The effects of distortion are noted, and attention is drawn to some hitherto unformulated rules relating the distortion in the current and voltage waves. Null methods of using the wattmeter are briefly described, and a new circuit is proposed. The concept of complex permeability is introduced as an approach to bridge measurements, and an equivalent circuit for a test transformer is deduced. It is shown how this may be used in a novel circuit in such a way as to eliminate copper losses. The limitations of the bridge method are briefly discussed, and the relation between bridge and wattmeter methods is shown to lead to the concept of \"distortion coefficient,\" a new characteristic property of the iron, which can be determined experimentally and which may provide a succinct approach to distortion problems.","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122901709","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
Anisotropic strains produced by surface abrasion, and their effect on the magnetic properties of silicon sheet steel 表面磨损产生的各向异性应变及其对硅钢片磁性能的影响
Journal of the Institution of Electrical Engineers - Part I: General Pub Date : 1948-10-01 DOI: 10.1049/JI-1.1948.0189
R. Martindale
{"title":"Anisotropic strains produced by surface abrasion, and their effect on the magnetic properties of silicon sheet steel","authors":"R. Martindale","doi":"10.1049/JI-1.1948.0189","DOIUrl":"https://doi.org/10.1049/JI-1.1948.0189","url":null,"abstract":"Measurements of magnetostriction and permeability of samples of hot-and cold-rolled silicon steels are given before and after abrasion in different directions relative to the applied field. It is shown that surface abrasion of electrical sheet steel produces high internal strains of a markedly directional nature which affect the magnetic properties. The results are interpreted in terms of the domain theory of ferromagnetism.","PeriodicalId":336705,"journal":{"name":"Journal of the Institution of Electrical Engineers - Part I: General","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1948-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124713474","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
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