DOI:10.1049/ji-2.1943.0032

出版商:IEE    

年代:1943

数据来源: IET

摘要:

The greatly increased prospective fault MVA at many switching stations, due to the rapid growth of interconnections on many systems during the last 15 years, has necessitated the design of circuit-breakers of larger capacity. This in turn has made desirable improved facilities for technical investigations and for proving the rating of the breakers.The paper discusses the mechanical and electrical factors which affect the design of alternators supplying power for switchgear testing. A review is made of several methods of increasing the output of such alternators, and the merits of each are critically examined.

DOI:10.1049/ji-2.1943.0033

出版商:IEE    

年代:1943

数据来源: IET

摘要:

A review is given of the development of boiler-plant instrumentation, from the early use of measuring instruments as mere safety devices to the modern employment of remote centralized control, based upon the comprehensive measurement of the operating conditions.It is contended that, as improvements in plant design and operating efficiency are governed by the degree to which their dependent factors are known and understood, exploratory measurement must embrace all the quantities which are measurable, while the operating measurements must include those of all the variables which are susceptible to regulation. A table of essential measuring instruments for shell-type and water-tube type boilers is included.Remote manual control is then compared with automatic control. The purpose is to show that, as measurement is now the acknowledged basis for control, it follows that the measuring instruments which detect and report the adverse tendencies should be used to institute the corrections needed to arrest them, wherever this is practicable.

DOI:10.1049/ji-2.1943.0035

出版商:IEE    

年代:1943

数据来源: IET

摘要:

The paper discusses the pros and cons of the standardizing of designs for overhead lines up to 33 kV, and concludes that this can be done in a rational manner which will avoid any likelihood of stultification of new ideas. The preparation of suitable standard designs of overhead lines could be undertaken by a standing B.S.I. Committee in the usual way.Some of the Electricity Commissioners' Regulations are reviewed, with particular reference to their latest modifications for light lines.Details are given of the design for light h.v. lines up to 22 kV which has been evolved by the E.R.A. and which is now being considered by the B.S.I. Its adoption as a standard is recommended. With slight modifications, this design is shown to be adaptable for 33-kV working and also for heavier conductors.An alternative design, employing wood “H” poles and suspension insulators, is suggested for special cases.A low-voltage design is also detailed and recommended.Finally, closer co-operation with the Post Office and the railway companies is urged.

DOI:10.1049/ji-2.1943.0038

出版商:IEE    

年代:1943

数据来源: IET