摘要:

The suitability of the single-phase system of supply for distribution in remote ruraldistricts, with particular regard to utilization, has been cogently argued by Pickles and Wills. The present paper is an extension of the same argument. It deals particularly with supply, and advances the merits of the phase/neutral system of single-phase h.v. distribution as compared with the normal practice in this country of utilizing two live phases. It also considers the problems arising out of the application of the phase/neutral system in areas where the existing h.v. network is 3-phase, 3-wire, and where there is accordingly no neutral conductor available for the connection of phase/neutral spurs.

DOI:10.1049/pi-2.1950.0086

出版商:IEE    

年代:1950

数据来源: IET

摘要:

After outlining the scope and importance of cotton processing, the paper indicates the progress in electrification in this basic industry, in which a large amount of power is still supplied by private steam plant. The relative proportions of private generating plant and public power supply are analysed, and a marked tendency towards the increased use of public supply is noted.The power requirements of the different sections of the industry are examined in general. Some of the major problems in electric driving are discussed in greater detail. Mention is made of electric metering, wiring practice, and various other applications of electricity in lighting, air conditioning, material control, etc.Suggestions are made for further papers in which outstanding problems might be discussed.A glossary of terms used in the cotton industry is given in Appendix 13.3.

DOI:10.1049/pi-2.1950.0099

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The paper gives an analysis of the 1157 faults due to lightning which have occurred during 14 years on the 5 900 miles of line of the British Grid system.It is shown that the fault rate varies approximately inversely with the system voltage, typical figures being 1 fault per 100 miles per year for the 132-kV lines, and 3.8 for the 33-kV lines. The annual, seasonal and diurnal variations in the incidence of lightning faults are studied, and figures are given for the mean fault rates in the different Grid areas. Factors of importance in the design of overhead systems are discussed, such as the reliability of double-circuit lines, the proportion of single-phase to multi-phase flashovers, and the effect of tower footing resistance. It is found that overhead lines can be put back into service again immediately after a lightning faultin 9 cases out of 10.It is estimated that, for an average Grid substation, there is not more than one fault due to a direct stroke in about 70 years. The ecords of transformer breakdowns are discussed in some detail, and it is shown that the most serious form of breakdown, failure of windings, has involved, on theaverage, 0.3 transformer per 100 transformers per year.The protective devices used on the Grid system are described, and information is included on the performance in service of rod gaps, expulsion tubes and Petersen coils. The rod gaps and expulsion tubes appear to have provided a useful measure of protection, and the 33-kV system fault data lead to the conclusion that the Petersen coils suppress about 50% of the faults. Some information, based on operating experience, is given on the protective effect of terminal cables.Finally, the use of radio methods for giving thunderstorm warnings and statistical information on lightning severity is briefly discussed.

DOI:10.1049/pi-2.1950.0108

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The paper describes those characteristics of lightning surges and system insulation and those electrical characteristics of systems which influence the design of surge diverters consisting of spark-gaps and non-linear resistors.The design of representative diverters of this kind is described and proposals for a British Standard for Surge Diverters are put forward.Methods of making and evaluating tests upon surge diverters are next considered, and details of the circuits and adjustment of the test equipment are given. The paper concludes with Sections on the installation and maintenance of surge diverters and upon surge counters.

DOI:10.1049/pi-2.1950.0111

出版商:IEE    

年代:1950

数据来源: IET

DOI:10.1049/pi-2.1950.0125

出版商:IEE    

年代:1950

数据来源: IET

DOI:10.1049/pi-2.1950.0126

出版商:IEE    

年代:1950

数据来源: IET

DOI:10.1049/pi-2.1950.0129

出版商:IEE    

年代:1950

数据来源: IET