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Electrical Engineers, Proceedings of the Institution of

Issue 6 • Date June 1974

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Displaying Results 1 - 23 of 23
  • Modular representation of multiple-valued logic systems

    Publication Year: 1974 , Page(s): 409 - 418
    Cited by:  Papers (13)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1083 KB)  

    A mode of description for multiple-valued logic systems is presented which is based on the familiar Galois field structures. It is demonstrated that the flexibility of the resulting modular algebras makes them highly suitable for this application. The relationship between the operational behaviour of a circuit and its standard form of algebraic representation is investigated, and a transform metho... View full abstract»

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  • Investigation of signal distortion in cables caused by imperfections in cable manufacture

    Publication Year: 1974 , Page(s): 419 - 431
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1597 KB)  

    A complete theory of signal distortion caused by irregularities in the structure of coaxial cable is developed. The theory is general in the sense that it is developed in terms of the properties of an arbitrary reflection-density function r(x) of the cable. The formulas derived relate signal distortion to the statistics of the r(x) process and to its power-density spectrum. The use of the theory i... View full abstract»

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  • Intrabundle and power-line carrier loss characteristics including effects of ice

    Publication Year: 1974 , Page(s): 432 - 434
    Cited by:  Papers (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (456 KB)  

    The theory of natural modes is adapted to provide a straightforward means of computing the fundamental-loss characteristics of multiconductor transmission lines when influenced by a uniform covering of ice on one or more conductors. Moreover, application of the method is usefully demonstrated by presenting the results of a computer study showing the effects of ice on the loss characteristics of in... View full abstract»

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  • Proposed European communication satellite system

    Publication Year: 1974 , Page(s): 435 - 442
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1080 KB)  

    The paper describes the derivation of the basic parameters of a European regional communication satellite system. The derivation involves optimisation of satellite antenna beamwidths and transponder bandwidths with respect to the expected traffic demands for the decade 1980 to 1990. Ground-station-sensitivity optimisation to achieve minimum overall system cost is described. Frequency reuse by the ... View full abstract»

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  • H-plane multimode waveguide transition sections with large flare angles: radial and rectangular modal analyses

    Publication Year: 1974 , Page(s): 443 - 449
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (602 KB)  

    Waveguide transition sections that connect standard single-propagating-mode waveguides to multimode waveguides are designed using a quasioptical approach, as well as fullwave techniques based on both radial and rectangular modal analyses. The three different approaches to the problem result in the derivation of the coupled wave equations for the wave amplitudes, which are solved numerically using ... View full abstract»

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  • Development of integrated digital telecommunication network

    Publication Year: 1974 , Page(s): 450 - 456
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1043 KB)  

    Ultimately the cost of providing a telephony service using digital techniques will be considerably lower than that incurred with the present techniques. However, a carefully planned sequence of introduction is necessary to avoid high costs during the period when analogue and digital techniques coexist. A proposal for expanding the present digital provision using an overlay network technique, which... View full abstract»

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  • Simulation of site tests on a 120 MW turbogenerator

    Publication Year: 1974 , Page(s): 457 - 463
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (682 KB)  

    The simulation of balanced and unbalanced fault tests on a 120 MW turbogenerator using digital-computer modelling techniques is described. A comparison of results obtained using two different generator-data sets is given, one derived entirely from machine tests and the other calculated from design information, supplemented by measured values of damping resistances. The computed fault curves obtain... View full abstract»

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  • New technique for quadrilateral distance relay

    Publication Year: 1974 , Page(s): 464 - 466
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (276 KB)  

    A new technique for the development of a quadrilateral distance relay for transmission-line protection is reported. The modus operandi consists in continuously monitoring the coincidence period of four suitably derived relaying quantities, and the relay is made to develop trip output if the coincidence period is zero, whereas if the coincidence period is finite, the relay develops restraining outp... View full abstract»

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  • Numerical integration algorithms in power-system dynamic analysis

    Publication Year: 1974 , Page(s): 467 - 473
    Cited by:  Papers (6)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1021 KB)  

    The outcome of recent test applications of a range of integration algorithms to models representative of those now widely encountered in large- scale power- system dynamic analysis is reported. The paper collects together the main requirements of practical dynamic analysis, and it gives the principal schemes and solution strategies that might be used in meeting these requirements. Plant equation s... View full abstract»

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  • Dynamic simulation of high-speed protection

    Publication Year: 1974 , Page(s): 474 - 480
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (886 KB)  

    Progessively reducing the measuring time of high-speed primary protection emphasises its dynamic response, both in the initial development and design of protection, and in its subsequent application. Of growing importance is the interaction between the distinguishable transient responses of the primary system protected, the transducers from which relaying signals are derived, and the measuring pro... View full abstract»

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  • Optimal load-flow solution by reduced-gradient method

    Publication Year: 1974 , Page(s): 481 - 487
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (863 KB)  

    An optimisation method employing the reduced-gradient technique for determining the economical voltage level and megawatt loadings of generating units in a power system is presented. The method is applied to find the operating conditions for minimum fuel cost or for minimum transmission loss. The solution is based on the calculation of the gradients of either of these objective functions with resp... View full abstract»

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  • Summary: Intrabundle and power-line carrier loss characteristics including effects of ice

    Publication Year: 1974
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (137 KB)  

    Summary of paper published in another division of the Proceedings of the IEE View full abstract»

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  • Automatic design of housing-estate distribution networks

    Publication Year: 1974 , Page(s): 488 - 490
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (324 KB)  

    New methods of automatic design, both static and dynamic, of closed housing-estate networks are described. The case of an h.v. distribution network for housing estates of several thousand to tens of thousands of inhabitants is also covered. In the static part, the following close-to-optimum values are determined: number of stations, their practical sitings, transformer ratings and configurations o... View full abstract»

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  • Micromachine simulation of steam power plant

    Publication Year: 1974 , Page(s): 491 - 499
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1081 KB)  

    Owing to the recent growth in turbogenerator size, the dynamics of the steam-power plant influence considerably the behaviour of a generating station during large transient disurbances. To study this behaviour, detailed mathematical large-signal, nonlinear models of a boiler, turbine, governor and automatic voltage regulator (a.v.r.) were developed both for digital- and analogue-computer applicati... View full abstract»

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  • Use of equivalent fields in electrical-machine studies

    Publication Year: 1974 , Page(s): 500 - 507
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (948 KB)  

    The terminal behaviour of electrical machines is usually described by means of equivalent circuits. To design machines to meet a specification, the manufacturer needs to be able to relate the internal magnetic field to the circuit parameters. It is not generally possible to obtain a complete solution to the field problems, nor is this necessary. A method is described in which the field is subdivid... View full abstract»

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  • Stability of a d.c. transmission link between weak a.c. systems

    Publication Year: 1974 , Page(s): 508 - 515
    Cited by:  Papers (11)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (849 KB)  

    The paper discusses the steady-state stability of an h.v. d.c. transmission system linking weak a.c. networks. A low a.c.-system short-circuit ratio complicates matters considerably as the combined a.c. network and filter impedance has a major influence on system stability. The determination of the approximate transfer functions of the combined a.c./d.c. system is achieved through use of modulatio... View full abstract»

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  • Transient-stability study using diakoptic model

    Publication Year: 1974 , Page(s): 516 - 517
    Save to Project icon | PDF file iconPDF (285 KB)  
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  • New static controller for d.c. machines

    Publication Year: 1974 , Page(s): 517 - 518
    Save to Project icon | PDF file iconPDF (314 KB)  
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  • Method of predicting transient-current patterns in transformers

    Publication Year: 1974 , Page(s): 518 - 519
    Save to Project icon | PDF file iconPDF (278 KB)  
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  • Design of proportional-integral derivative controllers for tracking polynomial-type inputs

    Publication Year: 1974 , Page(s): 521 - 524
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (215 KB)  

    A procedure for designing a proportional-integral (p.i.) controller for a multivariable system to track a polynomial-type input with zero steady-state error is given. This method is an extension of Parker's method. The method is applied to a multivariable system, and numerical results are presented. View full abstract»

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  • Kalman-filter divergence due to process-noise decoupling

    Publication Year: 1974 , Page(s): 525 - 528
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (410 KB)  

    The paper discusses a Kalman-filter divergence problem, caused by the partial decoupling of the process-noise covariance. A simple method for determining the optimum observation matrix is presented. The effectiveness of the procedure is illustrated by a computer simulation. View full abstract»

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  • Design of pole shifting and optimal controllers for a synchronous generator

    Publication Year: 1974 , Page(s): 529 - 532
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (394 KB)  

    The paper discusses the application of pole shifting and optimal-control theories to the design of feedback controllers for a fifth-order linearised model of a synchronous generator. The pole-shifting method used covers both the state and output-feedback cases. The optimal-control method described enables the designer to specify a suitable performance index which results in an optimal system with ... View full abstract»

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  • Progress in design and development of automatic vertical steering systems for underground coal cutters

    Publication Year: 1974 , Page(s): 533 - 536
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (471 KB)  

    Although control systems for steering coal cutters through undulating coal seams have been in use since the early 1960s, it is only since Webb's paper (Proceedings of the 3rd UKAC control convention, April 1968) in 1968 that the 3-dimensional dynamic nature of the process has been appreciated. The process model, previously expressed in terms of two independent variables, I and n, is here converted... 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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