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Electrical Engineers, Proceedings of the Institution of

Issue 4 • Date April 1973

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Displaying Results 1 - 23 of 23
  • High-resolution microwave holographic technique. Application to the imaging of objects obscured by dielectric media

    Publication Year: 1973, Page(s):401 - 406
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (886 KB)

    A high-resolution low-intensity microwave holographic-imaging technique is described. It has been successfully applied to the remote imaging of objects obscured by dielectric media. Experimental results show that small objects are clearly imaged through a thick intervening region of dielectric. Basic refraction effects at the dielectric surface enhance the object resolution. View full abstract»

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  • Microwave transmission through a series of inclined gratings

    Publication Year: 1973, Page(s):407 - 412
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (567 KB)

    A polarisation cascade matrix is derived which describes the transmission of an arbitrary elliptically polarised wave through an inclined grating of parallel wires. The terms of the matrix are the well established complex reflection and transmission coefficients for a linearly polarised wave incident on a single grating. Hence the matrix can be adapted for gratings with wires or strips of non-circ... View full abstract»

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  • Rainfall corosspolarisation at microwave frequencies

    Publication Year: 1973, Page(s):413 - 418
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (619 KB)

    An analysis of rainfall crosspolarisation at microwave frequencies is presented, taking into account differential phase shift through rain as well as differential attenuation. Rain models with distorted drops at either constant or distributed canting angles are considered. The implications of an oscillation-raindrop model are also discussed. Finally, the theory is compared with measurements of cro... View full abstract»

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  • Maximum off-axis gain of elliptical beams

    Publication Year: 1973, Page(s):419 - 422
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    Antenna beams of elliptical cross-section are analysed to determine the maximum gain that can be achieved over any particular elliptical cross-section. The analysis is concerned with maximising the gain at specified off-axis angles in the principal planes of the antenna. The maximum achievable gain is completely determined by the specified beam cross-section. Since the analysis applies to a lossle... View full abstract»

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  • Crosspath real-time optical correlator and ambiguity-function processor

    Publication Year: 1973, Page(s):423 - 428
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (805 KB)

    A new type of optical processor is described, and experimental performance data are presented in the form of ambiguity diagrams for various types of signal. The processor uses an ultrasonic light modulator with two electrical inputs and a simple optical arrangement which is relatively easy to align. The ambiguity diagrams are available in real time as light patterns, but the system may be adapted ... View full abstract»

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  • Decoder complexity for BCH codes

    Publication Year: 1973, Page(s):429 - 431
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (437 KB)

    The logic complexity and computational complexity of decoders for BCH codes are investigated, and bounds on complexity are obtained. These are compared with earlier. results of Savage for arbitrary block codes and for some special decoding rules. It is found that decoders for the class of BCH codes are of much lower complexity. View full abstract»

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  • Review of methods for numerical solution of the hollow-waveguide problem

    Publication Year: 1973, Page(s):431 - 432
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | PDF file iconPDF (215 KB)
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  • Present state of development of a gas-pressurised lapped-polythene cable for E.H.V. transmission

    Publication Year: 1973, Page(s):433 - 439
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1031 KB)

    Polythene tape in association with sulphur hexafluoride under pressure is an attractive dielectric for underground transmission cables because it has low dielectric loss, low relative permittivity and high thermal conductivity. Unfortunately, polythene tape has a high coefficient of thermal expansion, and care is consequently needed in the design of the conductor electrostatic screen to achieve ad... View full abstract»

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  • Lower-cost urban electricity-distribution systems by automatic control. Application to 11 kV and 33 kV systems

    Publication Year: 1973, Page(s):440 - 446
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (665 KB)

    The paper outlines a philosophy for applying automatic control to 11 kV and 33 kV distribution systems in urban areas to effect an improvement in transformer-utilisation factor of primary substations from a maximum of 50% to 75% and Grid substations from a maximum of 50% to 69%. A comparison of costs derived by the use of hypothetical network patterns and an assumed load density of 30 MW/km2 indic... View full abstract»

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  • Computation of eddy-current losses in cable sheaths and busbar enclosures

    Publication Year: 1973, Page(s):447 - 452
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (854 KB)

    The usual method of calculating cable-sheath eddy-current losses gives satisfactory results for high-resistance sheaths but not for low-resistance sheaths. A method developed by Dwight for calculating this type of loss in unbonded busbar enclosures is applicable for low-resistance cable sheaths, but is not presented in a generalised form. A general method is given for the calculation of eddy-curre... View full abstract»

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  • Armature-conductor impedances and commutation in d.c. machines

    Publication Year: 1973, Page(s):453 - 460
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (958 KB)

    Subject to certain approximations about the configuration of the flux associated with armature conductors in slots, the current-density distribution in the conductors is determined by a 1-dimensional diffusion equation, and solutions of this equation when the total current in the conductor may have any prescribed form of variation are obtained. The associated voltages for typical idealised reversa... View full abstract»

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  • Synchronous-machine model including eddy currents

    Publication Year: 1973, Page(s):461 - 468
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (903 KB)

    A simple dynamic model is developed for smooth-rotor solid-pole synchronous machines which takes account of rotor eddy currents. The model (in the same form as that of Park, but with an increased number of damper windings) is developed from the field solution for a machine of simplified geometry, by using Green's functions. The final field is expressed in terms of a series of modal eddy currents; ... View full abstract»

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  • Field-theory approach to induction-motor analysis

    Publication Year: 1973, Page(s):469 - 476
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (965 KB)

    The parameters of a complete induction-motor equivalent circuit are calculated following a direct solution of Poisson's equation over a radial cross-section of the machine with current in but a single coil side. This device leads to certain advantages over conventional methods with regard to cohesion, convenience and versatility, and facilitates the estimation of secondary effects due to factors s... View full abstract»

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  • Certain approaches to the analysis of single-sided linear induction motors

    Publication Year: 1973, Page(s):477 - 483
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (732 KB)

    The performance characteristics of single-sided linear induction motors (s.l.i.m.s) are obtained from quasirealistic and realistic models using Fourier transforms and numerical methods, respectively. The results thus obtained are compared with those given by analytical solutions for idealised models. The discrepancy in results is pointed out and a justification of the models presented in the paper... View full abstract»

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  • Diakoptics and system operations: automatic generation control in multiareas

    Publication Year: 1973, Page(s):484 - 490
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (849 KB)

    A procedure for the instant-by-instant control of all the generation, or the so-called automatic generation control, of power pools is described. The multicomputer configuration formed by the multiplicity of individual company computers present is utilised in the procedure. The method is an extension of the present basepoint-and-participation-factor approach used in the USA for the control of the ... View full abstract»

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  • Saturistor control of induction motor

    Publication Year: 1973, Page(s):491 - 496
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (787 KB)

    A simple analytical method is given for calculating induction-motor performance with a saturistor, alone or in series with a resistor, in its wound-rotor circuit. A digital-computer program, with fast convergence for iterative calculations, is developed for considering the resistor and saturistor in parallel. Despite the nonlinearity of the saturistor reactance and resistance, as well as motor sat... View full abstract»

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  • Modified travelling-wave techniques to solve electrical transients on lumped and distributed constant circuits. Refraction-coefficient method

    Publication Year: 1973, Page(s):497 - 504
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (842 KB)

    The paper describes a newly developed travelling-wave technique, the `refraction-coefficient method¿, to solve electrical transients on complicated lumped constant circuits connected to distributed lines. Travelling waves on distributed constants are calculated with the ordinary refraction coefficients, and travelling waves on lumped constants are dealt with by the modified refraction coefficient... View full abstract»

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  • Discussion on 'Design features of auxiliary electrical machines for rolling stock'

    Publication Year: 1973, Page(s):505 - 507
    IEEE is not the copyright holder of this material | PDF file iconPDF (548 KB)
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  • Optimal stationary feedback control with specified relative stability

    Publication Year: 1973, Page(s):509 - 513
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (615 KB)

    The paper presents a systematic procedure for designing optimal feedback control systems with the poles restricted either to the left of the line Re(s) =¿¿ or in a cone tan¿1{Im(s)/Re(s)} =±¿. Simple transformations of the complex variable s are utilised to find a characteristic polynomial for the desired closed-loop system. It is then shown that this polynomial can be used with the frequency... View full abstract»

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  • Impulse flashover of particle-contaminated spacers in compressed sulphur hexafluoride

    Publication Year: 1973, Page(s):514 - 518
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (622 KB)

    The impulse flashover stresses of coaxial-disc spacers, both clean and when contaminated with conducting particles, have been measured for pressures of the ambient SF6 gas between 0.47 and 1.5 MN/m2. Clean spacers had a higher flashover stress on positive than on negative polarity, but, for contaminated spacers, the positive stress was reduced much more than the negative stress. The effect of part... View full abstract»

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  • Control of corona and sparkover of coaxial systems by irradiation

    Publication Year: 1973, Page(s):519 - 522
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    The glow- and streamer-corona discharge forms occurring in air at the positive central conductor of a coaxial-cylinder system are examined. It is found that, for conductor diameters up to 1.2 cm, a glow discharge can be established, whereas for larger conductors streamer channels are always formed. For gaps preionised by irradiation from a 90Sr source of strength 0.4 mCi, the glow discharge is sus... View full abstract»

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  • Role of gas breakdown in the charging and discharging of macron clouds

    Publication Year: 1973, Page(s):523 - 526
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (634 KB)

    When a pile of dust is dispersed by a blast of air, a charged cloud is formed. The action of gas breakdown due to intense space-charge fields generated on dispersal is shown to explain a surprising invariance in the net charge of the cloud with flow velocity, particle size and material. When the cloud subsequently discharges to a small earthed electrode, the associated energy is of the order of th... View full abstract»

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  • On the special theory of relativity

    Publication Year: 1973, Page(s):527 - 528
    IEEE is not the copyright holder of this material | PDF file iconPDF (289 KB)
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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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