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Electrical Engineers, Proceedings of the Institution of

Issue 7 • Date July 1965

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Displaying Results 1 - 25 of 28
  • Sensitivity in some simple RC active networks

    Publication Year: 1965, Page(s):1263 - 1269
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (694 KB)

    Five different RC active networks are considered, each of which produces a second-order low-pass transfer function. Two of the networks use positive feedback (one from an amplifier of nominally unity gain); two use negative feedback (one from an amplifier of nominally infinite gain); and the fifth uses a negative-impedance convertor. Equations are developed for the sensitivity of each circuit to i... View full abstract»

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  • Design and performance of nonlinear interpolating squarers

    Publication Year: 1965, Page(s):1270 - 1278
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (954 KB)

    The principles of operation of nonlinear-interpolating-function generators are described. Nonlinear interpolators (n.l.i.s) comprise a plurality of nonlinear interpolating branches producing the desired output signal at a common output connection. The theory of the design of a simple halfsquarer is given, including a detailed consideration of both static and dynamic accuracy. N.L.I. squarers have ... View full abstract»

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  • Radiation from an electric dipole in an infinite column of warm plasma

    Publication Year: 1965, Page(s):1279 - 1290
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1024 KB)

    The radiation characteristics of an axially oriented electric dipole situated at the centre of an infinitely long, cylindrical column of warm plasma are investigated. Two types of surface waves are excited along the plasma column, and their dispersion and power relations are examined. The radiation pattern in the far zone and the radiation resistance arising from the space waves are evaluated, and... View full abstract»

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  • Method for the prediction of the fading performance of a multisection microwave link

    Publication Year: 1965, Page(s):1291 - 1300
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1142 KB)

    The paper describes the need for a simple method of predicting the performance of a multisection microwave link. From the results of propagation measurements, a relationship is established between the worst-month fading distribution of a given microwave path, its path length and the roughness of the terrain. This relationship is then used to establish methods of predicting the worst-hour mean ther... View full abstract»

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  • Further considerations of overmoded rectangular waveguide for high-power transmission

    Publication Year: 1965, Page(s):1301 - 1310
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1106 KB)

    In a previous paper, suggestions were advanced for using a large-size rectangular waveguide, whose transverse dimensions are just less than ¿×2¿, to increase the continuous-wave power-handling capability of a waveguide run. In the present paper, it is shown that, over a certain frequency range, the power handling can be further increased by operating the ¿/2¿ waveguide with the electric field... View full abstract»

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  • Tunnel-diode mixers

    Publication Year: 1965, Page(s):1311 - 1318
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (979 KB)

    When used as a frequency-mixing element, the tunnel diode has a performance which is superior in certain respects to that of existing mixer diodes at both u.h.f. and higher frequencies. The paper gives a brief outline of mixer theory and considers its application to the tunnel diode. The results of the analysis are compared with those of other authors, and the experimental results so far achieved ... View full abstract»

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  • Analysis of a fast-switching subharmonic parametric oscillator

    Publication Year: 1965, Page(s):1319 - 1326
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (641 KB)

    A subharmonic parametric oscillator, which uses the diffusion capacitance of a charge-storage diode, is described. The output of such a circuit may exist in one of two stable states, which are separated from one another in phase by ¿rad. Because of the nonlinear nature of the circuit, it is possible to change state within one cycle of the output voltage. The amplitude of the applied switching pul... View full abstract»

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  • Two new tubes for high-speed analogue multiplication

    Publication Year: 1965, Page(s):1327 - 1333
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (869 KB)

    Two new tubes for high-speed analogue multiplication at frequencies up to 200kc/s are described. The electrostatic field configurations required for multiplication are generated by special electrode systems which use plane electrodes, and are therefore relatively simple to construct and to mount with accuracy. The nonlinear error in prototype versions of these tubes is less than 2% of maximum outp... View full abstract»

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  • Review of guided wavesߝan appraisal of quasimodes

    Publication Year: 1965
    IEEE is not the copyright holder of this material | PDF file iconPDF (131 KB)
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  • Wide-ratio two-speed single-winding induction motors

    Publication Year: 1965, Page(s):1335 - 1347
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1470 KB)

    Previous papers have described the principle of pole-amplitude modulation (p.a.m.), and its application to produce 2-speed single-winding squirrel-cage induction motors. The original theory and practice referred, specifically, to close-ratio speed changing only. This paper discusses p.a.m. on the basis of ampere-conductor distribution; and it extends its application to a considerable range of wide... View full abstract»

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  • Transient torques in induction motors, due to switching of the supply

    Publication Year: 1965, Page(s):1348 - 1354
    Cited by:  Papers (34)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (839 KB)

    An experimental study of transient torques in induction motors, due to application of the supply, is described. The transient-torque recordings were obtained by means of a 2-phase induction generator, used as an accelerometer, and apply to the free-rotor, i.e. unloaded, condition. Point-on-wave switching was used to obtain selective transient-torque patterns. Results are given for 3-phase and sing... View full abstract»

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  • Calculation of the end-region field of a.c. machines

    Publication Year: 1965, Page(s):1355 - 1368
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1492 KB)

    The rapid increase in electric loadings of turboalternators has demanded improved methods of predicting the end-zone field distribution. The paper describes an analytical method for calculating the flux distribution in the end zone of a.c. machines based on the solution of Laplace's equation for the scalar magnetic potential. All end-zone boundaries are taken into account, although simplifications... View full abstract»

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  • Errors of sound-phase-compensation and residual-compensation systems in earth-fault distance relaying

    Publication Year: 1965, Page(s):1369 - 1382
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1364 KB)

    The paper deals with the errors inherent in the application of sound-phase and residual compensation to distance-relay protection of transposed and untransposed double-circuit lines, taking into account the combined effect of load and fault currents. The treatment thus extends consideration beyond the cases where the two main compensation systems are assumed to be ideal, under transposed condition... View full abstract»

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  • Developments in phase-comparison techniques for distance protection

    Publication Year: 1965, Page(s):1383 - 1394
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1137 KB)

    Phase-comparison methods of transmission-line protection by distance-to-fault measurement have been widely used in schemes based on electromechanical relaying elements, but investigations into logical methods of protection have exposed an incompleteness in its steady-state theoretical basis, and an only partial utilisation of the techniques that are available in a field which is appreciably wider ... View full abstract»

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  • Effects of prime-mover governing and voltage regulation on turboalternator performance

    Publication Year: 1965, Page(s):1395 - 1405
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1116 KB)

    The paper outlines the frequency-response analysis of a steam turboalternator using reheat, and examines the dynamic response of the unit when connected to a large power system. A mathematical representation of the system is made by linearising the nonlinear differential equations of motion using small-perturbation theory. Transient stability of the system is shown to be affected by feedback param... View full abstract»

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  • Influence of parasitic brush currents on the performance of d.c. generators

    Publication Year: 1965
    IEEE is not the copyright holder of this material | PDF file iconPDF (112 KB)
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  • Discharge detection and measurements

    Publication Year: 1965, Page(s):1407 - 1423
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2105 KB)

    Discharge measurements provide a sensitive, nondestructive means of detecting minute defects in insulation. The successful application of discharge-detection techniques depends on an appreciation of the following: the conditions in which discharges occur, the factors which affect the discharge magnitude and recurrence frequency, and the various mechanisms of deterioration and breakdown by discharg... View full abstract»

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  • Some experiments on a high-power closing switch with polythene as the main dielectric

    Publication Year: 1965, Page(s):1424 - 1430
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (835 KB)

    A switch consisting basically of a polythene sheet between two electrodes has closed successfully on pulses of up to 430kA and up to 170 coulombs, at up to 40kV. The switch is triggered by a high-current discharge from an auxiliary electrode. The polythene was stressed at up to 800 V/cm without puncturing prematurely. The closing time of the switch was approximately 2 ¿per millimetre of polythene... View full abstract»

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  • Influence of atmospheric ions on impulse corona discharge

    Publication Year: 1965, Page(s):1431 - 1438
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (929 KB)

    The investigation was an attempt to control the primary ionisation in a gap to be subjected to an impulse potential. The technique consisted of the application of a steady potential to a rod electrode prior to the impulse wave. The initial population of ions will then be controlled by a drift process. If a negative-polarity drift field is applied to the rod, the time lag of the impulse corona disc... View full abstract»

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  • Developments in electrochemical energy-conversion devices, batteries and fuel cells

    Publication Year: 1965, Page(s):1439 - 1448
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1353 KB)

    Primary and secondary batteries and fuel cells all convert chemical energy directly into electricity. Primary batteries, of the type used for hand torches, provide only very small units of power. Secondary batteries or accumulators supply amounts of power up to several hundred kilowatts and fuel cells have been proposed for even larger units. These systems differ basically from the well known elec... View full abstract»

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  • Internal impedancee of solid ferromagnetic conductors

    Publication Year: 1965, Page(s):1449 - 1461
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1260 KB)

    Experimental data are presented, concerning the behaviour of ferromagnetic conductors carrying alternating currents, for a wide range of frequencies and values of the surface-magnetising force. The experimental results are for mild-steel conductors having rectangular and circular cross-sections. The object of the investigation was to study the influence of both saturation and type of cross-section... View full abstract»

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  • Gamma-radiation-induced conductivity in glasses

    Publication Year: 1965, Page(s):1462 - 1467
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (726 KB)

    Determinations of the changes in the electrical conductivities of several different types of glasses during gamma irradiation have been made. Fused silica, aluminosilicate, borosilicate, and alkali lead-silicate glasses were among the types examined. The fused silica exhibited the most pronounced change in conductivity. For example, at a dose rate of 10rad(H2O)/s, the conductivity at room temperat... View full abstract»

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  • Insulator surface conduction

    Publication Year: 1965, Page(s):1468 - 1472
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (843 KB)

    This paper reviews the existing literature relating to the nature of surface conduction on solid dielectrics. Literature on the variations in conductance caused by changes in the ambient humidity, temperature and pressure; different dielectric materials and surfaces; surface contamination and the nature and magnitude of an applied voltage gradient, are also reviewed. The scope of the paper is limi... View full abstract»

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  • Discussion on 'Insulator surface conduction'

    Publication Year: 1965
    IEEE is not the copyright holder of this material | PDF file iconPDF (75 KB)
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  • Thin ceramic dielectrics combined with nickel electrodes

    Publication Year: 1965, Page(s):1474 - 1477
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (523 KB)

    A capacitance/volume ratio of 3 ¿F/cm3 has been achieved in an encapsulated ceramic capacitor without the use of precious metal for the electrodes. A modified form of barium titanate which can be sintered in a reducing atmosphere to yield a high-resistivity dielectric has been developed as the dielectric. Capacitors are made by assembling plastic-bound layers of barium titanate, with layers of po... 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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