By Topic

Electrical Engineers, Proceedings of the Institution of

Issue 6 • Date June 1967

Filter Results

Displaying Results 1 - 25 of 26
  • Group-velocity variations of v.l.f. signals

    Publication Year: 1967, Page(s):689 - 695
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (897 KB)

    Some experimental transmissions for the Omega navigation system were monitored over an 8500km path to determine the phase variations of the difference frequency between 10.2kc/s and 13.6kc/s. These results are interpreted in terms of the group velocity at the mean frequency of 11.9kc/s and are compared with calculations of group velocity based on first-waveguide-mode phase velocities due to Wait. ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Radar-waveform design for detecting targets in clutter

    Publication Year: 1967, Page(s):696 - 702
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The waveform dependence of matched-filter systems is investigated for detecting signals in nonstationary clutter, including the range dependence of the clutter power return. As is normally the case for microwave radars with moderate waveform durations, it is assumed that the r.m.s. clutter Doppler-shift spread is less than the signal Doppler-shift resolution. General expressions are derived for th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rocket-borne equipment for an l.f. D region propagation experiment

    Publication Year: 1967, Page(s):703 - 708
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (932 KB)

    Four rockets have been launched, each carrying equipment to measure the amplitude of the wavefield radiated into the ionosphere by a low-frequency transmitter on the ground. The experimental equipment is described in some detail, and the special precautions and environmental testing required for rocket experiments are discussed. The results are presented briefly. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Admittance of the fat cylindrical antenna. Experimental study

    Publication Year: 1967, Page(s):709 - 712
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    The fat cylindrical antenna was used as a unipole over a vertical ground plane, and was driven by a slotted coaxial line carrying a current probe. The antenna was a continuation of the inner conductor of the coaxial line, and its radius was a. Admittances were measured and calculated for a/¿ in the range 0.0128¿0.0179, where ¿ is the wavelength. The experimental results are presented in rectang... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Directional properties of circular arrays

    Publication Year: 1967, Page(s):713 - 718
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (849 KB)

    The paper discusses the possible forms of directional patterns obtainable for single-ring circular arrays. Consideration is given only to the patterns which lie in the same plane as the array. A simple Fourier harmonic-analysis technique is used to show how patterns can be synthetised and the limitations imposed on such patterns by the physical parameters of the array. This technique shows the fac... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Theory and practice of log-periodic aerials

    Publication Year: 1967, Page(s):719 - 725
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1082 KB)

    The paper surveys the theory and practical applications of the log-periodic aerial. The inherent frequency-independent characteristic is its basic feature, and this is obtained by developing a configuration which is defined by angles rather than by linear dimensions. The aerial is widely used in the h.f. band in the form of a log-periodic dipole array. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Investigation of multiple f.m./f.d.m. carriers through a satellite t.w.t. operating near to saturation

    Publication Year: 1967, Page(s):726 - 740
    Cited by:  Papers (57)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1888 KB)

    One method of providing multiple-access operation in a satellite communication system involves the transmission of many frequency-modulated carriers through a common broadband travelling-wave-tube (t.w.t.) amplifier in the satellite. Owing to the necessity to operate near the saturated output power of the t.w.t., amplitude nonlinearity and a.m./p.m. conversion will be significant factors in determ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tunable microwave-frequency light modulator

    Publication Year: 1967, Page(s):741 - 744
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (414 KB)

    A tunable microwave-frequency light modulator is described which consists of a rectangular-cross-section coaxial cavity containing two electro-optic crystals. The crystals are ammonium dihydrogen phosphate, the orientation being arranged so that the retardation due to each is added. Modulation has been observed over the frequency range 1.2¿4.8 GHz. The modulation depth was 10% with 3.5 W and a Q-... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An integrated system of metropolitan electricity supply. Experiences in design

    Publication Year: 1967, Page(s):745 - 754
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1483 KB)

    The paper describes the development, design and costs of the London Electricity Board's supply system since nationalisation. Information is given on the pattern of demand and load densities. Methods and aims in use since nationalisation and before are reviewed against the objective of a specific code of reliability as well as a prospective fourfold increase in future consumer demands. Alternative ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Double unbalances and transient analysis of power systems using R,S,T components

    Publication Year: 1967, Page(s):755 - 761
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (697 KB)

    R,S,T components are modified ¿,ß,0 components to obtain invariant transformation of power between the 3-phase system and the component system. The components are used in the paper to obtain the equivalent circuits for various types of simultaneous unbalances in a power system, for use on the a.c. network analyser, and are also applied to the transient analysis of power-system problems. Specific... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimisation of alternator voltage regulators for steady-state stability using the Mitrovic method

    Publication Year: 1967, Page(s):762 - 768
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (796 KB)

    In the paper, the Mitrovic method for analysis and synthesis of control systems is applied to the linearised equations of a synchronous machine, tieline and voltage regulator. It is shown that much useful information about the steady-state behaviour of the system may be obtained in this way with the minimum of computation. The method is also ideally suited to the optimisation of the parameters of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Circulating-current pilot-wire differential protection system

    Publication Year: 1967, Page(s):769 - 774
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    A circulating-current a.c. pilot-wire differential protection scheme is described in which compensation is provided for the phase shift of the fundamental-frequency signals transmitted over the pilot-wire circuit. Alternative relay characteristics are considered, with particular reference to the desirability of maintaining simultaneous tripping of circuit breakers at both ends of the protected sec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Numerical method of calculating eddy currents in nonmagnetic conductors

    Publication Year: 1967, Page(s):775 - 780
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (687 KB)

    A method of calculating the eddy currents in nonmagnetic conductors using the finite-difference technique of successive overrelaxation on a digital computer is outlined. The method is applied to the problem of eddy currents in hollow water-cooled conductors in electrical-machine slots, but it should also be immediately applicable to any 2-dimensional field compatible with the available computer ca... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Slip-ring skin currents as observed in the Canberra homopolar generator

    Publication Year: 1967, Page(s):781 - 786
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (789 KB)

    The Canberra homopolar generator, a kinetic-energy storage device with electric input and output, operates with solid brushes running on a mild-steel brush track on each rotor. In particular, the output brushes operate at a high current density (2000A/cm2) linear velocity (up to 150m/s). During initial testing, significant potential differences were observed along the brush track in the direction ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of the amplifier-servomotor by a graphoanalytical method

    Publication Year: 1967, Page(s):787 - 790
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (507 KB)

    A graphoanalytical method for the equivalent control air gap is described. The method analyses the operation of the amplifier-servomotor at standstill, establishing an expression for the starting torque. The operating principle of the amplifier servomotor is briefly outlined. It is shown that this new element has a high power gain, so that it can be controlled by d.c. signals from input transducer... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New methods of stabilising doubly fed slip-ring machines

    Publication Year: 1967, Page(s):791 - 796
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (759 KB)

    When the stator and rotor windings of a slip-ring machine are connected to supplies of fixed frequency, one of the possible modes of synchronous operation is at a speed proportional to the sum of the supply frequencies. Such a doubly fed machine, in its basic form, possesses considerable peak power capabilities but is dynamically unstable and is not self-starting. The paper demonstrates how a 2-po... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Change-speed reluctance motors

    Publication Year: 1967, Page(s):797 - 801
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (610 KB)

    The principle of pole-amplitude modulation has now emerged with such generality that it can be applied to almost every type of rotating electrical machine. The paper discusses its application to reluctance motors, and, as a typical example, describes the theory and design methods of a single-winding 2-speed reluctance motor for 4/6 poles, together with tests to compare the performance of this mach... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • South-West Scotland Sub-Centre: Chairman's address. Aspects of power in Norway

    Publication Year: 1967
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (145 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Capacitance potential dividers for the investigation of transient overvoltages in crossbonded cables

    Publication Year: 1967, Page(s):803 - 808
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (773 KB)

    The work outlined in the paper was initiated in order to ascertain the nature of transient overvoltages due to switching in a 132kV crossbonded-cable system. The instrumentation for recording high-voltage transients comprised high-ratio capacitance potential dividers capable of reproducing voltages at the cable terminals, cable midsections and cable joints, in conjunction with portable oscilloscop... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transient heating of buried power cables

    Publication Year: 1967, Page(s):809 - 816
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1311 KB)

    An account is given of past work in the field of thermal transients in buried cables. From the publications of Morello and Van Wormer, it follows that the earliest simplified theoretical formulas for the conductor transient, produced for application to small-diameter cables, can be correct only for times sufficiently large for the effect of the thermal capacity of the cable to be negligible. For s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Laboratory assessment and service performance of inhibited insulating oils

    Publication Year: 1967, Page(s):817 - 823
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (903 KB)

    The oxidation stability of inhibited insulating oils is usually assessed in the laboratory under one set of highly accelerated test conditions. The service life of these oils under normal operating conditions is now being shown to be very much less than that predicted by these tests, and in some cases it is no better than that of the base oil. As inhibited oils have always been considered capable ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Calculation of electric fields by digital computer

    Publication Year: 1967, Page(s):824 - 829
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (624 KB)

    Laplacian electric-field distributions are usually obtained with the aid of an electrolytic tank or other analogue means. Alternatively, it is possible to investigate such fields using numerical methods. The paper describes a method by which finite-difference equations are set up, for multidielectric fields in two dimensions or in three dimensions with at least one axis of symmetry, from the funda... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sparking voltage of a conductor passing through an earthed plate: Calculation of stresses by a numerical method

    Publication Year: 1967, Page(s):830 - 831
    IEEE is not the copyright holder of this material | PDF file iconPDF (183 KB)
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Contribution to the study of electric strength of polythene

    Publication Year: 1967, Page(s):832 - 833
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | PDF file iconPDF (164 KB)
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integrated control of a nonlinear turboalternator model under fault conditions

    Publication Year: 1967, Page(s):834 - 844
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1358 KB)

    The integrated control of a nonlinear turboalternator model interconnected with a grid system and supplying a local asynchronous-type load is studied. The alternator equations incorporate the effects of transient saliency, positive-sequence damping, field-flux-linkage variation, machine saturation and excitation control. Turbine input power is controlled by a conventional governor representation w... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

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

Full Aims & Scope