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Electrical Engineers, Proceedings of the Institution of

Issue 2 • Date February 1974

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Displaying Results 1 - 15 of 15
  • Active simulation of floating lossy inductances

    Publication Year: 1974, Page(s):85 - 87
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (301 KB)

    Some general rules concerning the simulation of floating impedances using immittance-convertor circuits are introduced, and used to derive RC-active circuits for simulating floating inductances in series or in parallel with resistances. These circuits require only two operational amplifiers to produce a single floating lossy inductance. Practical examples are given of these methods applied to the ... View full abstract»

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  • Analysis of systems switched with alternating polarity

    Publication Year: 1974, Page(s):88 - 90
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (249 KB)

    An original approach for the analysis of switching-control circuits is described. A new transformation method is introduced to simplify the calculations. This method is especially suitable for switching that is not synchronised with the frequency of the mains supply. Practical uses of such circuits are described in a companion paper. View full abstract»

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  • Formulation of the sensitivity function using signal-flow graphs

    Publication Year: 1974, Page(s):91 - 94
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (296 KB)

    An equation is obtained which gives the derivatives of the graph transfer functions with respect to a parameter of interest when the parameter is the transmittance of many branches and when the graph transfer functions are in the bilinear form of the parameter. This equation is useful for evaluating the sensivity functions of active RLC network functions by variation of the passive or active param... View full abstract»

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  • Design of a high-efficiency v.h.f. double-sideband diminished-carrier transmitter having low spurious emission

    Publication Year: 1974
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (555 KB)

    Interest has recently been shown in the use of d.s.b. diminished carrier for the mobile land radio service. Difficulties in the design of a suitable transmitter employing a conventional exciter-amplifier technique are described. A method that overcomes these difficulties is discussed, and a suitable design presented. A transmitter capable of delivering 38 W peak envelope power with an 18 V supply ... View full abstract»

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  • Capacitively loaded thin cylindrical antenna

    Publication Year: 1974, Page(s):101 - 108
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (914 KB)

    Extensive experimental and theoretical results are presented for thin cylindrical antennas with lumped capacitive loadings along their length. The capacitive loading is in the form of a narrow gap between two sections of the antenna. Experimental curves for the gap capacitance against gapwidth are presented, and these values are used in calculating current distribution along the antenna and its ad... View full abstract»

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  • Unified theory of digital modulation

    Publication Year: 1974, Page(s):109 - 115
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (795 KB)

    A theory of signal quantisation is developed from first principles that describes quantisation using analogue-modulation techniques. The nonlinearities, which are fundamental to digital source encoding, are expressed by two sampling processes, which directly lead to solutions in terms of amplitude and phase modulation. The analysis derives a related set of mathematical models that deter mini stica... View full abstract»

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  • Gain of an idealised Yagi array

    Publication Year: 1974
    IEEE is not the copyright holder of this material | PDF file iconPDF (82 KB)
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  • Braking torque on rotating sheet in stationary magnetic field

    Publication Year: 1974, Page(s):117 - 122
    Cited by:  Papers (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (609 KB)

    The braking torque, that acts on a nonmagnetic metal disc of radius a rotating at constant speed in a nonuniform magnetic field, is determined. Solutions are obtained by means of an electromagnetic analogy and by direct integration of the relevant differential equation. Comparison with experimental results is provided. View full abstract»

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  • Dynamic model of impulse characteristics of concentrated earths

    Publication Year: 1974, Page(s):123 - 135
    Cited by:  Papers (98)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1119 KB)

    A dynamic model to describe the nonlinear surge-current characteristics of several concentrated earths has been developed. The model accurately accounts for the surge behaviour of these earths on a time-to-time basis, in soils with resistivities ranging from 5000 ¿ cm to 31 000 ¿ cm. This results in a significant improvement over the previous methods used to describe them. The use of the new mod... View full abstract»

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  • Surge propagation on Japanese 500 kV untransposed transmission line

    Publication Year: 1974, Page(s):136 - 138
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (283 KB)

    The propagation characteristics of various surges on a 500 kV untransposed transmission line in horizontal array are described, and the test data are compared with computer results. Interesting phenomena are observed at the wavefronts of surge waves in the field test, and these are substantiated both analytically and by computer calculation. View full abstract»

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  • Optimal planning of power networks using mixed-integer programming. Part 1: Static and time-phased network synthesis

    Publication Year: 1974, Page(s):139 - 147
    Cited by:  Papers (55)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1161 KB)

    A mixed-integer linear programming approach to the planning of electrical-power networks is described. The method is based on an interpretation of fixed-cost transportation-type models, and includes both network security and costs of network losses. Both single-period and multitime-period planning problems are considered. A large general-purpose mathematical programming system is used to obtain so... View full abstract»

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  • Measurement of some dynamic characteristics on overhead equipment for railway electrification

    Publication Year: 1974, Page(s):147 - 148
    IEEE is not the copyright holder of this material | PDF file iconPDF (208 KB)
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  • Field mapping using a computer: compensation for infinite space

    Publication Year: 1974, Page(s):149 - 153
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (455 KB)

    The paper describes a development of the concept of the matching field to compensate for the finite boundary in the mapping of Laplacian-type fields. Items located in infinite space can be transposed into the enclosed matching field by using a `spatial transformation¿ formula. The method permits the accurate mapping of local regions of interest, and some practical examples are given. View full abstract»

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  • Electrical resistance of an insulating surface under artificial rain

    Publication Year: 1974, Page(s):154 - 160
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (778 KB)

    In this paper, a method is developed to calculate the steady-state surface resistance of an inclined rectangular insulating plate under artificial rain in terms of both the rain and plate characteristics. The factors involved include the rain intensity, the resistivity, the precipitation angle and the velocity (drop size) as well as the plate length, the inclination and the surface roughness. A di... View full abstract»

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  • Impulse-voltage breakdown of cold pressurised helium

    Publication Year: 1974, Page(s):161 - 164
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    Experiments on impulse breakdowns between uniform-field electrodes in helium are described. The breakdown fields of gaps from 1.27 to 6.35 mm are reported for helium conditions varying from 4.5 to 10 K and 0.395 to 0.82 MPa, corresponding to a density range from 25 to 140 kg m¿3. Comparisons with published direct-voltage breakdowns are made and the mechanisms discussed. 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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