摘要:

With the increase in the high-voltage overhead-contact system of railway electrification throughout the world in the past 10 years it has become increasingly necessary to investigate in greater detail the problems associated with current collection, particularly with the lighter overhead equipment used in this system and the higher train speeds possible with electrification.These problems have been dealt with in connection with the 25 kV a.c. electrification schemes in British Railways by the design of overhead equipment to meet the particular requirements and also by the development by the London Midland Region of a specially instrumented high-speed test car capable of measuring all the factors influencing current collection.

DOI:10.1049/pi-a.1962.0042

出版商:IEE    

年代:1962

数据来源: IET

摘要:

The paper, assuming a knowledge of the published descriptions of the equipments used and of Brigadier Langley's reports on the trouble experienced with some of it, describes the performance of equipment of all kinds in 18 months of service, during which 1100 single-track miles of overhead equipment have been brought into use on the 25/6.25 kV 50c/s a.c. system. Individual sections deal with:The method and cost of obtaining freedom from interference with neighbouring light-current circuits.The performance of the power-supply and overhead equipments, including reference to the use of 25 kV only on the Euston- Manchester-Crewe electrification and the retention of the dual-voltage 25/6.25 kV system elsewhere.The satisfactory performance of the electrical equipment of five of the seven types of 800 hp multiple-unit train equipment which have aggregated about 25 million miles in service, and of the five types of 3300 hp locomotives. Statistics are given of the performance of certain important components.The hope is expressed that the information given warrants confidence in the future of the equipments in use.The paper indicates the ways in which the information obtained from this experience with prototype equipment will be used for the further improvement of future equipments.

DOI:10.1049/pi-a.1962.0045

出版商:IEE    

年代:1962

数据来源: IET

摘要:

The paper describes the conversion from the 1500 V d.c. to the 25 kV and 6-25kV a.c. 50c/s system of electrification of the British Railways Eastern Region lines between Liverpool Street, Shenfield, Chelmsford and Southend (Victoria). The history of the projects and reasons for change are set out, together with the effect of electrification of other lines in the area. An endeavour has been made to cover in a balanced manner all principal aspects of the conversion operation from planning to conclusion, power supply, substations and switching stations, supervisory control, overhead-line equipment, rolling stock, signalling and telecommunications, civil engineering and the actual change-over sequence.It was a combined operation requiring most meticulous planning if the very heavy electric services operating over the lines concerned were not to be disrupted, with great inconvenience to hundreds of thousands of regular, daily passengers. The operation was successfully completed to a very restricted time schedule within little more than a month of the original target date owing to the unsparing efforts of many on the railway, with contractors and with the electricity supply undertakings.

DOI:10.1049/pi-a.1962.0048

出版商:IEE    

年代:1962

数据来源: IET

摘要:

The paper discusses the various problems that arise in supplying railway single-phase loads from the British Grid system, including unbalanced effects, fluctuations and harmonics.The importance of a high short-circuit level for connecting the railway supply transformers is demonstrated.Details are given of the equipment provided at the points of supply and of the methods of controlling and protecting it.

DOI:10.1049/pi-a.1962.0051

出版商:IEE    

年代:1962

数据来源: IET