DOI:10.1049/ji-2.1945.0019

出版商:IEE    

年代:1945

数据来源: IET

摘要:

The paper deals particularly with the electrostatic precipitation of dust entrained by flue gases produced from the combustion of anthracite in pulverized form. It describes field experiments and results on a pilot-scale electrostatic precipitator operating on such flue gases, as well as the salient features of a large-scale commercial installation, and discusses some of the operating results obtained therefrom.

DOI:10.1049/ji-2.1945.0020

出版商:IEE    

年代:1945

数据来源: IET

摘要:

The performance, over the period of twelve years ended 1943, of the cable terminations in service on the British Grid system at voltages between 3.3 kV and 132 kV is reviewed, and the causes of breakdown are examined. Features of construction which have contributed to failure, and the measures adopted to secure improvement in service performance, are indicated. Consideration is given to the fundamental characteristics required of a termination, and to the test and other requirements embodied in the specifications of the Central Electricity Board. Recent types of termination are described, including 132-kV outdoor sealing ends for use with the latest types of mass-impregnated pressure cable. Directions in which design developments may be expected are indicated.

DOI:10.1049/ji-2.1945.0023

出版商:IEE    

年代:1945

数据来源: IET

摘要:

The paper states the requirements which the design of electrical accessories for domestic purposes must fulfil and how such requirements can be met. Contacts and switching are dealt with at some length because of their effect upon the performance and life of most accessories. The fundamentals of fuse design are given, as well as the reason for possible indiscriminate operation between fuses of different types.The need to break away from some time-honoured practices is shown, with particular reference to plugs and tumbler switches; solutions based on theoretical and practical considerations are presented. Some parts of the paper may appear elementary, but their inclusion is justified by the many accessories on the market and installed which reveal a lack of elementary engineering knowledge in those responsible for their design, production and installation.It is hoped that the paper will stimulate progress in the design of the accessories under consideration and raise the standard of this branch of the electrical industry to its proper level. But progress will be delayed if electrical contractors persist in considering only the first cost and ignoring the costs of installation and maintenance.The author strongly supports and recommends British Standard Specifications, but feels that they should be confined to setting standards of performance, with interchangeability only where required, and that constructional details and dimensions thereon should be omitted so as to give maximum freedom for development and, therefore, progress in design.

DOI:10.1049/ji-2.1945.0026

出版商:IEE    

年代:1945

数据来源: IET

摘要:

In the post-war world there are bound to be innovations in measuring instruments, among which is the electricity meter, a vital auxiliary in electricity generation and supply, involving makers, users and various authorities. The author gives a meter engineer's impressions of conditions, of hopes and disappointments, of past and possible developments. General considerations and requirements as to the electricity meter are then presented, particular emphasis being laid upon the necessity for stability in the most thorough sense, and dimensional standardization is examined. The author proposes that future meters should take one recognizably similarnationalform, the present British Standard being broadened and made more definite for the purpose. Suggestions to this end are made, and some consideration is given to the proposed National Electricity Meter in practice.

DOI:10.1049/ji-2.1945.0030

出版商:IEE    

年代:1945

数据来源: IET

摘要:

The object of the paper is to outline a simple and comprehensive procedure for the practical application of the principles determining the economic selection of transformers. If some degree of uniformity could be achieved in these calculations it would be of great advantage to all concerned. Two aspects of the problem are considered: the relatively simple one relating to the purchase of transformers, and the much more complex one dealing with the designing of transformers to satisfy specific economic requirements in individual cases. The formulae developed are supplemented by practical information on the selection of the correct values for the requisite coefficients. A statistical survey is made of methods used hitherto by different buyers of transformers for the capitalization of the transformer losses. Finally, approximate values of the coefficients in the formulae for the capitalization of losses are suggested, which may be used in the absence of more precise information.

DOI:10.1049/ji-2.1945.0033

出版商:IEE    

年代:1945

数据来源: IET

摘要:

The performance requirements of large electrical plant such as a.c. turbo-type generators vary a great deal, so that the question of standardization is very complicated. It is also difficult, because each manufacturer has built up designs and manufacturing experience over a period of many years. Standardization will, of necessity, introduce changes in both design and manufacture which naturally will not find ready acceptance unless they carry with them some advantages. The technical difficulties in obtaining standardization of designs are formidable, and would require a great deal of consideration. The effect of standardization on future developments is of great importance, and must be given close attention.The possibilities of complete unification of designs, an alternative of mechanical interchangeability, and the standardization of requirements, which is the first step in either of these directions, are considered in turn.The conclusions arrived at are that for both commercial and technical reasons complete unification of designs must be regarded as unpractical under present conditions, and it seems very doubtful whether the alternative of mechanical interchangeability would be feasible. In view of the complexity of the problem the close collaboration of all engineers concerned will be essential.

DOI:10.1049/ji-2.1945.0038

出版商:IEE    

年代:1945

数据来源: IET