Your browser does not support JavaScript!
http://iet.metastore.ingenta.com
1887

Proceedings of the IEE - Part A: Power Engineering

Volume 102, Issue 5, October 1955

Volumes & issues:

Volume 102, Issue 5

October 1955

Electrolytic processes for surface conditioning of metals
  • Author(s): J.W. Cuthbertson
  • Source: Proceedings of the IEE - Part A: Power Engineering, Volume 102, Issue 5, p. 501 –509
  • DOI:  10.1049/pi-a.1955.0112
  • Type: Article
  • + Show details - Hide details
  • p. 501 –509 (9)
    The uses of electrolysis, for the surface cleaning and descaling of metals, for improving the resistance of aluminium and its alloys to oxidation and abrasion, and for the polishing of metals, are discussed.Compared with direct-immersion processes, electrolytic cleaning and descaling is often speedier, more efficient and easier to control. In cathodic cleaning, adventitious matter is loosened by the nascent hydrogen evolved on the surface of the work, while the gas itself is a powerful reducing agent. Anodic pickling in acid electrolytes is precise in action and avoids the dangers of hydrogen embrittlement and of over-pickling. Alternate anodic and cathodic procedures offer certain advantages that are leading to their wider adoption.Theory and practice in the anodic oxidation of aluminium are discussed; reference is made to the use of this type of process to facilitate photographic reproduction on the surface of the metal, and to modifications of anodizing technique designed to produce especially hard, wear-resisting films.The principles of electrolytic polishing are explained. Industrial practice in the electrolytic polishing of steel, nickel, copper and aluminium is outlined. A comparison is drawn between electrolytic and mechanical polishing, and some reference is made to the economics of the electrolytic process.
    Add to favourites
    Export citations
The electrical equipment of the Toronto subway cars
  • Author(s): Frank W. Roberts
  • Source: Proceedings of the IEE - Part A: Power Engineering, Volume 102, Issue 5, p. 510 –523
  • DOI:  10.1049/pi-a.1955.0113
  • Type: Article
  • + Show details - Hide details
  • p. 510 –523 (14)
    The paper deals with the 600-volt rolling stock designed and built in England to the order of the Toronto Transportation Commission in Canada (since reconstituted as the Toronto Transit Commission), whose new underground electric railway is now in passenger service. The traction equipment is described, together with the arrangements for the collection of power by the trains and its distribution in them. Particular reference is made to the provisions for the safe return of current to the rails. The low-voltage auxiliary equipment is described, and the extensive arrangements for coach heating and ventilation are set out; the electro-pneumatic braking system and door control are also detailed. The descriptions are preceded by a survey of the traffic problems of the city of Toronto and the decisions taken to expedite the movement of its urban passengers. The paper closes with a few comparisons with similar stock elsewhere and gives numerical data in an appendix.
    Add to favourites
    Export citations
Discussion on “The electrical equipment of the Toronto subway cars” before the Institution, 10th March, 1955
Discussion on “The electrical equipment of the Toronto subway cars” before a joint meeting of members of the Institution and of the Engineering Institute of Canada, at Toronto, 12th October, 1954
The author's reply to the discussions on “The electrical equipment of the Toronto subway cars”
Discussion on “Electricity in the wool-textile industry”
The authors' reply to the discussion on “Electricity in the wool-textile industry”
The standardization of retail electricity tariffs
  • Author(s): A.O. Johnson  and  N.F. Marsh
  • Source: Proceedings of the IEE - Part A: Power Engineering, Volume 102, Issue 5, p. 533 –556
  • DOI:  10.1049/pi-a.1955.0119
  • Type: Article
  • + Show details - Hide details
  • p. 533 –556 (24)
    The aim of the authors is to review the general position with regard to the standardization of retail electricity tariffs in those parts of Great Britain served by the fourteen Area Boards.Broadly, the paper covers:(a) The situation at vesting date (1st April, 1948).(b) How tariff standardization has been tackled.(c) The progress so far made in the introduction of standard tariffs.(d) Problems encountered in introducing standard tariffs.Tariffs for domestic, industrial, commercial and farm consumers and for combined premises are considered. Notes are included on tariffs in the North of Scotland and Northern Ireland, and brief references are made to salient points of comparable tariffs in some other European countries.
    Add to favourites
    Export citations
The authors' reply to the discussion on “The standardization of retail electricity tariffs”
Discussion on “Electric lifts in post-war housing” before the North-Western Utilization Group, at Manchester, 16th February, and the North Midland Utilization Group, at Leeds, 23rd November, 1954
Discussion on “An assessment of the impregnated pressure cable”
An examination of high-voltage d.c. testing applied to large stator windings
  • Author(s): R.T. Rushall  and  J.S. Simons
  • Source: Proceedings of the IEE - Part A: Power Engineering, Volume 102, Issue 5, p. 565 –579
  • DOI:  10.1049/pi-a.1955.0123
  • Type: Article
  • + Show details - Hide details
  • p. 565 –579 (15)
    The merit of a proposed non-destructive method of assessing the breakdown voltage of stator-coil insulation by means of high-voltage direct current is examined. The proposal is to measure the steady-state leakage current at successive increments of applied voltage and predict a breakdown value from the trend of the plotted results.Laboratory tests applied to a range of specimens of sheet insulation, including a number with artificially-formed faults, indicate that the only breakdown which can be predicted by this method is that across air paths external to the specimen.Tests carried out on a complete high-voltage stator winding and on single stator coils give similar results. No assessment of slot-insulation quality is possible: the only increase in current, suggestive of approaching failure, results from end-winding leakage and discharge effects. Surface contamination of the end-winding and even quite extraneous discharges, when present, have a marked influence on the current measurements.It is concluded that the high-voltage d.c. method of testing investigated has no valid basis for non-destructively indicating the service-ability of the insulation of high-voltage machines.
    Add to favourites
    Export citations
The authors' reply to the discussion on “An examination of high-voltage d.c. testing applied to large stator windings”
Current summations with current transformers
  • Author(s): A. Hobson
  • Source: Proceedings of the IEE - Part A: Power Engineering, Volume 102, Issue 5, p. 581 –588
  • DOI:  10.1049/pi-a.1955.0125
  • Type: Article
  • + Show details - Hide details
  • p. 581 –588 (8)
    The behaviour of current transformers in parallel, and of similar circuits employing summation transformers, is studied for different conditions of load distribution.After the existing theory concerning idle currents has been rejected it is demonstrated that the overall error is very nearly constant for a given total load, no matter how the current may be shared among the line transformers. A complete equipment may thus be regarded as a single current transformer and the circuit parameters are considerably simplified, enabling practical formulae to be established for determining the overall errors.In the latter part of the paper it is shown how the effective burdens on the individual transformers may be estimated and how test results at these burdens may be used to compute the overall errors. Worked examples are given, together with confirming test results.
    Add to favourites
    Export citations
Discussion on “Current summations with current transformers” before the Measurements Section, 1st February, 1955
Discussion on “Current summations with current transformers” before the North-Western Measurements Group, at Manchester, 25th January, 1955
Discussion on “Current summations with current transformers” before the Mersey and North Wales Centre, at Liverpool, 21st March, 1955
The author's reply to the discussions on “Current summations with current transformers”
Discussion on “Measurement of the winding resistances of a 132 kV power transformer in service”
Dynamic operation of an a.c. network analyser
  • Author(s): S. Kaneff
  • Source: Proceedings of the IEE - Part A: Power Engineering, Volume 102, Issue 5, p. 597 –606
  • DOI:  10.1049/pi-a.1955.0131
  • Type: Article
  • + Show details - Hide details
  • p. 597 –606 (10)
    Methods are described for representing synchronous machines, by means of which an a.c. network analyser can be constructed to solve both steady-state and transient power-system problems automatically, without the need for tedious step-by-step processes. An existing a.c. network analyser may readily be converted to dynamic operation by modification of the generator units only, as herein lies the only radical alteration in representation proposed. Choice of time scale for the study of electro-mechanical transients is arbitrary. However, advantages are indicated for a time scale of the order of 1 min on the analyser corresponding to 1 sec on the actual power system. Results of tests (employing a.c. network analyser units) are included, and possible improvements are discussed.
    Add to favourites
    Export citations
Discussion on “Service experience of the effect of corrosion on steel-cored-aluminium overhead-line conductors”
The capability of alternators
Discussion on “The technique and development of automatic winding in mine shafts”
Discussion on “Meter problems and consumers' load characteristics”
Discussion on “Technical colleges and education for the electrical industry”
Discussion on “Problems of hydro-electric design in mixed thermal–hydro-electric systems” before the South-East Scotland Sub-Centre, at Edinburgh, 19th April, 1955
Discussion on “A short modern review of fundamental electromagnetic theory”
A high-power mechanical contact rectifier
Discussion on “Some researches on current chopping in high-voltage circuit-breakers”
Matrix methods for the evaluation of simultaneous faults in three-phase systems
A note on the surface loss in a laminated pole-face
The initiation mechanism of long sparks in point-plane gaps
Second-order torque components in the Schrage motor operating at synchronous speed
Steady-state stability of synchronous generators as affected by regulators and governors

Most viewed content for this Journal

Article
content/journals/pi-a
Journal
5
Loading

Most cited content for this Journal

We currently have no most cited data available for this content.

Print this page
This is a required field
Please enter a valid email address