摘要:

The author first discusses the conditions which have led the French Government to consider an extensive electrification scheme, of which the railways will form only a part, and he then explains the general method adopted in drawing up the scheme and utilizing in the most economical manner the sources of power available.Particulars are given of the power supply to the Orléans Railway and the rolling stock already in use and on order.Finally, the design of electric locomotives is discussed, and a comparison is made between electric and steam locomotives.

DOI:10.1049/jiee-1.1926.0094

出版商:IEE    

年代:1926

数据来源: IET

摘要:

The subject of high-power fusible cut-outs is one entitled to the greatest respect, but it has undoubtedly been neglected in the past. The author has endeavoured to tackle the subject from a logical point of view in the present paper, and, in view of its fundamental importance, the problem of rupturing capacity has been selected as that to which attention is primarily confined.The paper includes a consideration of the factors influencing the rupturing capacity of a cut-out, and a description of an extensive series of tests carried out on various types of cut-outs, including many of those most widely used to-day. A selection is given from the records of tests on fundamental forms of elementary construction, on plain cut-outs and on various commercial forms, and this shows clearly the inadequacy of such cut-outs for high-power work. Certain recently developed forms of cartridge cut-outs which operated satisfactorily are referred to and their sphere of usefulness is indicated. A description is given of an ironclad oilimmersed cut-out, which appears from the tests to satisfy nearly all requirements for high-power work. A new design of cut-out for small-current high-pressure services is also described.An attempt has been made, by carrying out actual rupturing-capacity tests, to indicate how far the various types of cut-outs can be safely employed, and a chart has been drawn up to show a comparison between the rupturing capacities of these types.A striking feature made apparent by the tests is that there are remarkably few efficient cut-outs available. This is all the more to be regretted when it is realized that a fusible cut-out can be made into a most accurate and efficient device—consistency of calibration and consistency of rupturing performance being possible to a high degree of excellence.

DOI:10.1049/jiee-1.1926.0098

出版商:IEE    

年代:1926

数据来源: IET

摘要:

The importance of earthing metal bodies other than conductors is stressed by all electricity law-makers and is denied by few, if any, engineers. At the same time rules, regulations, etc., covering the installation and maintenance of electric plant and equipment strictly avoid specification beyond that vague expression “satisfactory.” The paper suggests a starting point for investigation having as its objective the defining of conditions which will preclude all possibility of dispute.

DOI:10.1049/jiee-1.1926.0104

出版商:IEE    

年代:1926

数据来源: IET

摘要:

The paper discusses the basis of a life specification for thermionic valves, similar to those in force for electric lamps, and indicates the assistance which a life-test equipment and data afford in preparing such specifications. The general characteristics of thermionic valves are then described, in relation to the problems involved in designing such an installation. Solutions of these problems are then discussed more fully, and a large installation for testing the life of valves is described. Typical examples of the results obtained are given.

DOI:10.1049/jiee-1.1926.0105

出版商:IEE    

年代:1926

数据来源: IET

DOI:10.1049/jiee-1.1926.0108

出版商:IEE    

年代:1926

数据来源: IET