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Electrical Engineers, Proceedings of the Institution of

Issue 4 • April 1978

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Displaying Results 1 - 21 of 21
  • Microwave modelling of h.f. Yagi antennas over imperfectly-conducting ground

    Publication Year: 1978, Page(s):261 - 266
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (710 KB)

    Yagi antennas Operating at 25 MHz over real ground have been modelled at microwave frequencies. The method of modelling ground, the measurement of its electrical parameters and the apparatus for measuring radiation patterns of model antennas are described. Typical radiation patterns thus obtained are compared with those predicted from theory. View full abstract»

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  • Frequency multiplication using field-effect transistors

    Publication Year: 1978, Page(s):267 - 268
    IEEE is not the copyright holder of this material | PDF file iconPDF (216 KB)
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  • Parametric oscillatory motion in electromechanical devices

    Publication Year: 1978, Page(s):269 - 277
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (993 KB)

    An analysis is presented which explains the mechanism of parametric motion in electromechanical devices. The implications of the mechanism, in the unstable operation of a wide range of electrical machines, are indicated; for example, in stepper motors where, under certain combinations of system parameters and operating conditions, oscillations superimposed on the synchronous rotary motion are obse... View full abstract»

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  • Electromagnetic field diffusion in ferromagnetic materials

    Publication Year: 1978, Page(s):278 - 282
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (559 KB)

    The diffusion of electromagnetic fields under pulse excitation in ferromagnetic materials is investigated using finite-difference techniques. The nonlinearity of the magnetisation curve is taken into account, and special attention is given to high saturation. The diffusion in the semi-infinite space is studied for various waveshapes and for different field intensities. For electromagnets with rota... View full abstract»

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  • Multilayer approach to the analysis of single-sided linear induction motors

    Publication Year: 1978, Page(s):283 - 287
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (531 KB)

    Among linear electric motors, single-sided linear-induction motors (s.l.i.m.s) with sheet on solid-back-iron secondary have been generally preferred for low-speed drives and, in the last few years, they are considered one of the most probable alternative for the propulsion of some of the medium and high speed vehicles of the near future. Although a precise assessment of the performance of s.l.i.m.... View full abstract»

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  • Hysteresis motor with overexcitation and solid-state control

    Publication Year: 1978, Page(s):288 - 292
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (541 KB)

    The overexcitation for a short period of a hysteresis motor when running synchronously gives a reduction in stator current and an increase in pull-out torque. The physical concept of the phenomenon is briefly discussed and an empirical equivalent circuit incorporating a residual flux voltage is established which gives reasonable agreement with measured values. Methods of implementation of the tech... View full abstract»

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  • Decoupled stability studies

    Publication Year: 1978, Page(s):293 - 297
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (572 KB)

    A new algorithm has been developed for fast-transient-stability studies, by decoupling the machines from each other and suitably modifying the electrical output to take into account the effect of the rest of the system. Apart from speed, this gives additional information about the quality of stability of the system. View full abstract»

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  • Simulator for studying operational and power-supply conditions in rapid-transit railways

    Publication Year: 1978, Page(s):298 - 303
    Cited by:  Papers (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (751 KB)

    The paper describes the development of a computer-based simulator which may be used to study the relationships between train movements and power-supply conditions in a 2-road rapid-transit railway. The work was specifically undertaken to enumerate the energy saving consequent on the introduction of chopper-controlled traction-control equipment with regenerative-braking capability. In the simulator... View full abstract»

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  • Simulation studies of energy saving with chopper control on the Jubilee line

    Publication Year: 1978, Page(s):304 - 310
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The paper describes energy-consumption studies undertaken for the operation of rapid-transit services on London Transport's new Jubilee line. The object of the studies was to provide comparative figures for the energy consumption of a chopper-controlled fleet and a conventionally equipped rheostatically-controlled fleet. The work was undertaken using a digital computer simulator in which train mov... View full abstract»

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  • Use of London's electricity supply system for centralised control

    Publication Year: 1978, Page(s):311 - 327
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3066 KB)

    The paper reviews the pioneer work carried out by the London Electricity Board, leading up to the installation of a mains-borne signalling system for off-peak load switching in a large council housing development in the London Borough of Brent. It shows how technical liaison between a manufacturer and an area board has contributed to the evolution of a secure and viable scheme. Sensitivity and sta... View full abstract»

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  • Evaluation of p.w.m. inverter schemes

    Publication Year: 1978, Page(s):328 - 334
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (829 KB)

    The paper surveys the various pulse-width-modulation schemes used in thyristorised inverters. The practical problem of choosing the two variables, frequency-modulation index M and depth of modulation ¿, which determines the output waveshape of the p.w.m. inverter, is also discussed. An algorithm is given to select the values of M and ¿ to obtain minimum low-order harmonics. Some sample results f... View full abstract»

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  • Economic load-dispatch solution using fast-decoupled load flow

    Publication Year: 1978, Page(s):334 - 335
    IEEE is not the copyright holder of this material | PDF file iconPDF (252 KB)
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  • Winding grading of single-phase induction motors

    Publication Year: 1978, Page(s):335 - 336
    IEEE is not the copyright holder of this material | PDF file iconPDF (219 KB)
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  • Canonical form for the reduction of linear scalar systems

    Publication Year: 1978, Page(s):337 - 342
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (693 KB)

    Consideration is given to the problem of the reduction of order of a scalar system S(A, B, C) described by a transfer function g(s). On the assumption that the reduced-order model is to be used for feedback control-systems design, a canonical form is derived equivalent to a system decomposition related to the asymptotes, intercepts and finite zeros of the system root locus. A model reduction proce... View full abstract»

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  • Design of a dynamic output-feedback compensator

    Publication Year: 1978, Page(s):343 - 345
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (334 KB)

    A dynamical system in the usual state space form is augmented with a series connection with another dynamical system of calculable order. A state-feedback controller is then designed for the compound system. A method is then given which designs a dynamically equivalent output-feedback system. Feedforward matrices can then be added to achieve static decoupling of some states and outputs. An illustr... View full abstract»

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  • New method of deriving equivalence conditions in linear diffusion equations

    Publication Year: 1978, Page(s):345 - 346
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | PDF file iconPDF (178 KB)
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  • Lightning and tall structures

    Publication Year: 1978, Page(s):347 - 351
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (835 KB)

    The mechanism by which lightning is attracted to an earthed structure of low height is well established, and the distances over which strokes of different intensities are attracted (the so-called striking distances) have been determined. It appears that the numerical values so established do not apply to structures exceeding, say, 20m in height. In the electric field under a thundercloud, tall str... View full abstract»

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  • Light emission and deterioration in epoxy resin subjected to power frequency electric fields

    Publication Year: 1978, Page(s):352 - 354
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (594 KB)

    Light emission from an epoxy resin specimen with pin-plane electrodes was studied using a refrigerated 13-stage photomultiplier and a 4-stage image intensifier. In the pretreeing period weak light, comparable in intensity to that resulting from thermal photomultiplier noise, was observed together with visible effects of deterioration such as fine shadow lines and void formation and growth. The det... View full abstract»

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  • Wattmeter for some common requirements

    Publication Year: 1978, Page(s):355 - 358
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    The paper describes the background requirements and development work leading to the production of a low cost static wattmeter for use in educational establishments. Initially it was envisaged that the new wattmeter would have some industrial applications and these aspects are described, although no development has been done as yet. The form of the paper follows the growth of the new wattmeter from... View full abstract»

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  • Turbulence in high-current arcs

    Publication Year: 1978, Page(s):359 - 360
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (274 KB)

    Analysis of published experimental results of axial distrubution of the central plasma velocity of free-burning arcs, at currents of 500 A to 2.16 kA, indicates that turbulent exchange processes are dominant. The derived turbulence parameter using Prandtl's mixing-length theory is seven times larger than the only value previously estimated from the measurements of arc parameters. However, our valu... View full abstract»

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  • Surface-discharge-initiated breakdown in solid dielectrics immersed in high-pressure gaseous mixtures

    Publication Year: 1978, Page(s):361 - 363
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (439 KB)

    Preliminary results of investigations into the characteristics of anomalous breakdown phenomena in synthetic solid insulating materials immersed in gaseous mediums and subjected to alternating voltages are reported in this paper. The breakdown voltage of the solid dielectric was found to decrease with increasing gas pressure. In a medium of a gaseous mixture of CCl2F2 and N2, the solid breakdown v... View full abstract»

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Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

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