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Journal of the Institution of Electrical Engineers - Part II: Power Engineering

Volume 89, Issue 9, June 1942

Volumes & issues:

Volume 89, Issue 9

June 1942

Proceedings of the Sections of the Institution
The optional-control system of domestic electricity supply
  • Author(s): P. Schiller
  • Source: Journal of the Institution of Electrical Engineers - Part II: Power Engineering, Volume 89, Issue 9, p. 170 –174
  • DOI:  10.1049/ji-2.1942.0029
  • Type: Article
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  • p. 170 –174 (5)
    This is a continuation of the author's previous paper on “The Control of the Domestic Load.”†The usual objection to domestic load control of any kind is that it involves encroachment on the consumer's liberty in using his electricity supply as he thinks fit. To dispose of this objection it is now suggested that the consumer be given the opportunity at any moment and for any period of time readily to change over from a controlled to an uncontrolled supply, and vice versa, the consumption during periods in which the load control is made inoperative being charged at an increased price. This need not be accompanied by two-rate metering or accounting, for the change in price can be effected by a gear-change device in the kWh register or in the prepayment mechanism of the meter, actuated in conjunction with the change-over in the operation of the load control. The necessary modification of apparatus is of a minor nature, and so is the extra cost entailed.
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Written contributions to the discussion on “The optional-control system of domestic electricity supply”
Discussion on “The optional-control system of domestic electricity supply” and Mr. Schiller's earlier paper entitled “The control of the domestic load”
The author's reply to the discussions on “The optional-control system of domestic electricity supply” and “The control of the domestic load”
The measurement of lightning voltages and currents in Nigeria. Part 2: 1938–1939
Discussion on “The measurement of lightning voltages and currents in Nigeria. Part 2: 1938–1939” before the Transmission Section, 10th December, 1941
A clock-controlled governor for close speed regulation
  • Author(s): J.C. Prescott  and  M.N. Karaosman
  • Source: Journal of the Institution of Electrical Engineers - Part II: Power Engineering, Volume 89, Issue 9, p. 210 –216
  • DOI:  10.1049/ji-2.1942.0035
  • Type: Article
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  • p. 210 –216 (7)
    The maintenance of a truly constant speed under conditions of varying load is beyond the capability of a centrifugal governor, an increase in load being associated with a fall in speed coterminous with the increase. If, however, the speed is controlled by comparison with some reliable standard of frequency it may be made synchronous with this standard except during those periods when the load is actually changing.In the apparatus described here the speed of an electric motor is synchronized with a pendulum clock and it is shown that the arrangement will apply corrections for speed deviations as small as ±0.03% on nominally constant loads, and will correct variations as large as ±7.5% which may be caused by changing loads.
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Some considerations concerning the siting of power stations
  • Author(s): F. Favell
  • Source: Journal of the Institution of Electrical Engineers - Part II: Power Engineering, Volume 89, Issue 9, p. 217 –226
  • DOI:  10.1049/ji-2.1942.0036
  • Type: Article
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  • p. 217 –226 (10)
    In recent years the siting of electricity generating stations has tended to be increasingly affected by non-technical considerations such as legal requirements, amenities and so on. These considerations become of special importance when a particular scheme is submitted to a Public Inquiry by the Electricity Commissioners under Section II of the Electricity (Supply) Act, 1919.The object of this paper is to place on record some considerations which may therefore have to be borne in mind when siting power stations in this country, and at the same time to refer to some factors which have a bearing on power station construction irrespective of location.The paper is not intended to be an exhaustive treatise on the various subjects appertaining to the siting of power stations, but rather to act as a guide to undertakers who are contemplating such action.The paper may be divided into two main parts, the first dealing with considerations arising out of parliamentary legislation, and the second with more technical and practical problems.Reference is made in the first part of the paper to the following items:—(1.1) Town and Country Planning Act, 1932.(1.2) Coal Act, 1938.(1.3) Coal Mines Act, 1930.(1.4) Other statutory requirements.The second part deals with:—(2.1) Chimney emissions.(2.2) Sewage effluent for circulating water.(2.3) Amenities.(2.4) Alternative sites.
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The theory of the inductor alternator
  • Author(s): J.H. Walker
  • Source: Journal of the Institution of Electrical Engineers - Part II: Power Engineering, Volume 89, Issue 9, p. 227 –241
  • DOI:  10.1049/ji-2.1942.0037
  • Type: Article
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  • p. 227 –241 (15)
    This paper describes briefly the construction of typical homopolar and heteropolar inductor alternators, and gives a theoretical basis of design which has produced satisfactory results in practice.It is shown how the ratio of alternating flux to total flux can be calculated in the normal case of rectangular rotor slots and in the special case where the rotor teeth and slots are designed to give a sinusoidal alternating flux wave.In discussing the main types of armature windings it is shown how by maintaining a certain relationship between the number of rotor slots and the number of phases, a single-phase winding may be connected to give a polyphase supply.In the derivation of the armature-reaction formula it is shown that some types of windings cause less armature reaction than others, and also that, except in the case of a true polyphase winding, an efficient damping system is necessary.Methods of predetermining the field current on open-circuit and on load are indicated; the necessity of taking precautions to avoid dangerous bearing currents in the homopolar alternator is discussed, and the paper concludes with an investigation of the losses in these alternators.
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Discussion on “Space heating by means of electrically warmed floors, as applied to surface-type air-raid shelters” before the North-Eastern Centre, at Newcastle, 8th December, 1941
The author's reply to the discussions on “Space heating by means of electrically warmed floors, as applied to surface-type air-raid shelters”
Further written contribution to the discussion on “The characteristics and performance in service of high-voltage porcelain insulators” before the Institution
Discussion on “The characteristics and performance in service of high-voltage porcelain insulators” before the South Midland Centre, at Birmingham, 1st December, 1941
Discussion on “Pole-face losses due to open slots”
Discussion on “Outdoor bushings—their construction, testing and standardization”
The author's reply to the discussions at Newcastle, Manchester and Liverpool on “Outdoor bushings—their construction, testing and standardization”
Discussion on “The Electricity Supply (Meters) Act, 1936—its legal and technical implications”
The author's reply to the discussion on “The Electricity Supply (Meters) Act, 1936—its legal and technical implications”

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