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Electrical Engineers, Proceedings of the Institution of

Issue 12 • Date December 1979

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Displaying Results 1 - 25 of 43
  • Receiving and transmitting properties of small grid paraboloid by moment method

    Publication Year: 1979, Page(s):1209 - 1219
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1278 KB)

    The receiving and transmitting properties of a grid paraboloidal reflector of aperture diameter 2.73¿ and f/D ratio 0.395, operating at 410 MHz, are analysed using the moment method. For the receiving situation, with a normally-incident plane wave illuminating the reflector, the distributions of current, obtained in the inner grids only, show a close resemblance to those predicted by the physical... View full abstract»

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  • Analysis of a circular-disc printed-circuit antenna

    Publication Year: 1979, Page(s):1220 - 1222
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (302 KB)

    The input impedance and the electromagnetic fields of a circular-disc printed-circuit antenna are found. The antenna is driven at an arbritrary point. The present analysis takes into account the radiation through the side wall and the fringe field at the edge of the printed-circuit antenna. View full abstract»

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  • G.T.D. analysis of the near-field patterns of pyramidal horns

    Publication Year: 1979, Page(s):1223 - 1226
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (318 KB)

    A technique of analysing the principal-plane near-field patterns of pyramidal horns excited in the dominant mode based on the uniform geometrical theory of diffraction (u.g.t.d.)1, 2 is presented in this paper. The geometrical-optics field is derived by approximating the horn as a quasipyramidal horn waveguide.9 Numerical computations of the near-field amplitude patterns of a typical pyramidal hor... View full abstract»

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  • Mode spectrum of the modified Goubau line

    Publication Year: 1979, Page(s):1227 - 1232
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (759 KB)

    The problem of surface-wave propagation over the modified Goubau line, which consists of a Goubau line with an airgap between the conductor and dielectric, is formulated by the boundary-value method. The various modes which exist on the line as well as their cutoff conditions and the specific effects of the airgap are obtained from a solution of the characteristic equation. The mode spectrum for t... View full abstract»

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  • Class of optimum m.t.i. filters for clutter rejection

    Publication Year: 1979, Page(s):1233 - 1236
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (398 KB)

    The problem of optimum design of an m.t.i. system for clutter rejection is considered in this paper. The procedure involves minimisation of the output clutter power subject to the constraint that the average output-signal power over the expected target Doppler range is to be kept constant. Another constraint in the minimisation problem is incorporated, according to which the transfer function of t... View full abstract»

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  • Rain attenuation measurements using the equivalent-distance model

    Publication Year: 1979, Page(s):1237 - 1240
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (486 KB)

    Five years of slant-path-attenuation and point-rain-rate measurements in Sweden have been used to estimate the prediction accuracy of a simple equivalent-distance model. Radiometer attenuation data at 11.4 and 14.0 GHz, obtained at 21° elevation and rain-rate data from a tipping-bucket-type rain gauge have been used. The long-term predication error is estimated to be within a few tenths of a dB, ... View full abstract»

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  • Maximisation of signal/noise ratio in antenna arrays subject to constraints

    Publication Year: 1979, Page(s):1241 - 1244
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (418 KB)

    The problem of applying a set of constraints to antenna arrays is discussed. It is shown that when the noise between different elements is uncorrelated, the optimum radiation pattern can be expressed as a sum of the quiescent beam and the constraint-vector beams. To determine the excitations of the array, only the weighting coefficients of the constraint-vector beams need to be calculated. The met... View full abstract»

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  • Controllable d.c. power supply from wind-driven self-excited induction machines

    Publication Year: 1979, Page(s):1245 - 1248
    Cited by:  Papers (78)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (491 KB)

    A variable-speed generating system is described which uses a 3-phase squirrel-cage induction machine with self-excitation capacitors. The variable-frequency/variable-voltage generated is then fed through a 3-phase controlled rectifier to provide a d.c. supply at constant voltage. The proposed scheme is suitable for wind power sources as it allows wide changes in wind turbine speed and, at all spee... View full abstract»

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  • Asynchronous performance of single-phase reluctance motors

    Publication Year: 1979, Page(s):1249 - 1254
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (877 KB)

    The starting and pull-in behaviour of typical, single-phase reluctance machines, with and without capacitive excitation, is explored experimentally and by computation. A comprehensive study of the effects of impedance variations on the pull-in performace is presented. This study enables new designs to be produced which are shown to exhibit greatly improved pull-in behaviour. The experimental machi... View full abstract»

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  • Surge arresters for sheath protection in crossbonded cable system

    Publication Year: 1979, Page(s):1255 - 1262
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1004 KB)

    The paper presents results of digital computer calculations of the sheath overvoltages and the energies absorbed by sheath-protecting surge arresters in a crossbonded cable system. Especially, the energy loading of the arresters during energisation and discharge of an underground cable-overhead line configuration is considered. An analysis of the natural wave propagation characteristics of the cab... View full abstract»

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  • Inclusion of surge diverters in system overvoltage calculations

    Publication Year: 1979, Page(s):1263 - 1268
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (729 KB)

    In transmission systems operating at the higher voltage levels, increasing use is being made of surge diverters as the first line of defence against overvoltages. The determination of the interaction between the surge diverters and the system is therefore becoming of prime importance. When studies of this interaction are to be performed numerically, means have to be developed for representing the ... View full abstract»

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  • Transient pilot-cable induction from underground power-transmission systems

    Publication Year: 1979, Page(s):1269 - 1274
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (795 KB)

    The paper considers transient induction from an undergound power circuit into an adjacent pilot cable. Results, in the form of transient waveshapes, are given for a number of representative cases in response to step-type energisation of one of the power cables. The results show that dangerous transient overvoltages may arise in the case of relatively long systems. The paper then compares various d... View full abstract»

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  • 3-phase a.c./d.c. load flow

    Publication Year: 1979, Page(s):1275 - 1281
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (768 KB)

    A phase-co-ordinate model of h.v. d.c. transmission systems suitable for integration into 3-phase load-flow analysis is developed in the paper. The model is sufficiently general to allow representation of alternative control strategies, such as the predictive and symmetrical firing control. The integration of the model into the load-flow analysis described with particular reference to the 3-phase ... View full abstract»

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  • Development of electromechanical filter and performance evaluation in d.c. link

    Publication Year: 1979, Page(s):1282 - 1286
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (619 KB)

    The characteristics of electromechanical filters for the suppression of harmonics and the supply of reactive power on the a.c. side of d.c.-link convertors are described. The problem in the design and construction of small-scale units are highlighted. Tests with the prototype filters on a model d.c. link show that stability margins are considerably improved when compared to operation with conventi... View full abstract»

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  • Problem of synthetic circuit-breaker testing with voltage injection

    Publication Year: 1979, Page(s):1287 - 1290
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (427 KB)

    When testing high voltage circuit breakers synthetically the question arises as to how the test results can be compared with test results in direct tests. In the paper the thermal equivalence between direct testing and the method of voltage injection is investigated. The circuit breaker is modelled by the Urbanek equation. It is shown that the prospective voltage alone cannot define the test circu... View full abstract»

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  • The problem of defining a test circuit for circuit breakers in terms of the prospective voltage

    Publication Year: 1979, Page(s):1291 - 1294
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    The present IEC requirements for testing high-voltage circuit breakers impose certain conditions on the prospective voltage of the test circuit. This approach seems justified by the fact that the prospective voltage in theory describes exactly the test circuit in its elements and its topology. As in practice the prospective voltage is known only with certain tolerances, this method needs to assume... View full abstract»

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  • Susceptibility of 3-phase power systems to ferro-nonlinear oscillations

    Publication Year: 1979, Page(s):1295 - 1300
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (721 KB)

    A numerical method is described for predicting the possibility of jump resonance or subharmonic oscillations being sustained by a given 3-phase circuit, based on the describing function and dual-input describing function concepts of control theory. The method can be applied to predict asymmetrical jump modes which have no equivalent in single-phase circuits. Results predicted by this method are co... View full abstract»

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  • New diakoptic technique for load-flow solution of very large power systems using the bus admittance matrix

    Publication Year: 1979, Page(s):1301 - 1302
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (271 KB)

    A new exact diakoptical technique for load-flow solution of very large power systems, using the bus admittance matrix, is developed. This method employs bifactorisation and other sparsity techniques. It produces the same final result, retains the convergence property of the original untorn system, and can be applied to systems of any voltage level. View full abstract»

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  • Parametric oscillatory motion in electromechanical device

    Publication Year: 1979, Page(s):1303 - 1304
    IEEE is not the copyright holder of this material | PDF file iconPDF (216 KB)
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  • Erratum: Synthetic testing: the present state

    Publication Year: 1979
    IEEE is not the copyright holder of this material | PDF file iconPDF (39 KB)
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  • Some observations on the Aizerman conjecture

    Publication Year: 1979, Page(s):1305 - 1306
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    This paper shows that a pole transformation on a nonlinear autonomous feedback system can alter the frequency response of the linear element and eliminate those characteristics which have previously been suggested as indicators of counterexamples to the Aizerman conjecture. The root locus, however, is invariant under this transformation and examination of counterexamples has revealed common proper... View full abstract»

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  • Attitude control of a flexible satellite in noisy environment

    Publication Year: 1979, Page(s):1307 - 1310
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (511 KB)

    A method is presented for the design of a discrete, state-vector feedback controller operating on an open-loop unstable process. Kalman filtering is used for state estimation and the effectiveness of this technique is evaluated for high levels of noise. View full abstract»

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  • Synthesis of input signals for parameter identification using moving-average filter

    Publication Year: 1979, Page(s):1311 - 1315
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (525 KB)

    A moving-average filter is used to generate input signals for system identification. This has enabled the development of an efficient numeric algorithm and also some sufficiency results for a stationary point of the filter parameters. These sufficiency results give simple design equations for the design of identification experiments with an output-power constraint. A theoretical result for autoreg... View full abstract»

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  • Dominance improvement by pseudodecoupling

    Publication Year: 1979, Page(s):1316 - 1320
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (495 KB)

    Pseudodecoupling enables the design of frequency-dependent precompensators (postcompensators) to improve the column (row) dominance of the compensated plant over an extended range of frequencies. This allows diagonal dominance to be achieved for a wider range of plants than was previously possible. The procedure arises from generalising Hawkins's pseudodiagonalisation procedure in a number of dire... View full abstract»

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  • Online identification of linear discrete-time multivariable systems

    Publication Year: 1979, Page(s):1321 - 1325
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (511 KB)

    A unified recursive algorithm is presented for identifying linear discrete-time multivariable systems from the input/output data which may be contaminated with noise. The system is represented in the form of a transfer-function matrix, and decomposed into subsystems corresponding to each row. The proposed algorithm is based on determining the order of each subsystem utilising the residual-error te... 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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