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Electrical Engineers, Proceedings of the Institution of

Issue 10 • Date October 1974

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Displaying Results 1 - 25 of 31
  • Design of precision rectifiers using operational amplifiers

    Publication Year: 1974, Page(s):1041 - 1044
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    Two new precision rectifiers, a halfwave circuit and a full wave circuit, are described. The circuitsemploy operational amplifiers to eliminate the effects of diode nonlinearity and diode-temperature dependence. The transfer characteristics of the two circuits are derived by analysis. Experimental results are also provided which show that the circuits operate accurately over a large dynamic range ... View full abstract»

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  • Synthesis of high-stability 4th-order single-sideband crystal lattice filters

    Publication Year: 1974, Page(s):1045 - 1050
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (522 KB)

    A lowpass antimetric ladder network is transformed into a single-lattice single-sideband crystal filter using simple network equivalences and an asymmetrical frequency transformation. A methodis then given for altering the phase shift independent of both the attenuation and network configuration, and applied so that a crystal in each lattice arm resonates at the frequency of infinite attenuation. ... View full abstract»

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  • Power reciprocity in antenna theory

    Publication Year: 1974, Page(s):1051 - 1056
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (749 KB)

    A rigorous derivation of the power-reciprocity theorem in antenna theory is presented. It relates the absorption cross-section of the load in the receiving situation to the power gain of the antenna in the transmitting situation. The most general case is considered, namely (a) the materialof which the antenna is made may be lossy, anisotropic and inhomogeneous, if only linear in its electromagneti... View full abstract»

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  • Transmission loss in a waveguide partially filled with dielectric

    Publication Year: 1974, Page(s):1057 - 1058
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (251 KB)

    The. problem is to calculate the dielectric loss in a waveguide partially filled across its smaller dimension. A numerical solution can be found which applies for any ratio of dielectric thickness to height of guide, but only when the dielectric loss is small. Numerical results agree with some obtained by previous authors. View full abstract»

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  • Frequency control using binary rate multipliers for automatic testing on c.w. radar systems

    Publication Year: 1974, Page(s):1059 - 1066
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (875 KB)

    R.F. signals with certain defined characteristics have to be generated for ground testing on f.m. c.w. radar airborne-guidance systems. Normally in flight, two r.f. signals would be received; one direct from the ground transmitter and the other originating at the same transmitter, but reflected from a target. A lowfrequency wide-deviation frequency modulator is applied to the carrier at the ground... View full abstract»

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  • Hybrid decoding for digital-communication-feedback systems

    Publication Year: 1974, Page(s):1067 - 1075
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1162 KB)

    Forward error correction (f.e.c.) and decision feedback (a.r.q.) are combined using a hybrid decoding scheme of partial error correction and partial error detection. This is shown to have advantages when a low error probability is required and efficient use of transmitter power is important. The performance of the scheme is analysed, assuming transmission over a channel disturbed primarily by whit... View full abstract»

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  • Computer-controlled queuing system with switching network and blocked customers rejoin end of queue

    Publication Year: 1974, Page(s):1076 - 1079
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (415 KB)

    The paper presents a detailed study of a computer-controlled queuing system with Poisson input, firstcome first-served queue discipline, multiple exponential servers, switching network and blocked customers feedback to the end of the queue. A generating function for the stationary-state probabilities of the system and a necessary and sufficient condition for the existence of statistical equilibriu... View full abstract»

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  • Computer-controlled queuing system with feedback and swap times

    Publication Year: 1974, Page(s):1080 - 1085
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (605 KB)

    The paper presents a detailed investigation of a computer-controlled queuing system with Poisson input, multiple exponential servers, first-come first-served queue discipline, feedback and fixed finite swap times. The swap time is the time needed for the allocated server to acquire necessary information about the customer to be served and set up a necessary connection. A generating function for th... View full abstract»

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  • Note on digital-summation threshold-logic gates

    Publication Year: 1974, Page(s):1085 - 1086
    IEEE is not the copyright holder of this material | PDF file iconPDF (201 KB)
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  • IEE Conference Publication 114. Electromagnetic-wave theory

    Publication Year: 1974, Page(s):1087 - 1088
    IEEE is not the copyright holder of this material | PDF file iconPDF (268 KB)
    Freely Available from IEEE
  • Generalised analysis of machine windings, impedances and generated e.m.f.s, with particular reference to multispeed synchronous machines

    Publication Year: 1974, Page(s):1089 - 1098
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1194 KB)

    The paper extends previously available results for the calculation of airgap flux densities, generated e.m.f.s and synchronous impedances for all types of salient-pole or segmented synchronousmachines. Special emphasis is placed on multispeed machines, both excited and unexcited, but results for single-speed machines are included as particular cases. Nonidentical phase windings are treated as is n... View full abstract»

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  • Linear induction motors as `electromagnetic rivers¿

    Publication Year: 1974, Page(s):1099 - 1108
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1367 KB)

    Conducting material, in both the solid and the liquid state, can be suspended above a.c. coil systems. It is shown how a rectangular plate, suspended by one such system, may also be propelled by the same system of currents which serve to suspend it, and that lateral guidance is then automatically built into the system. In early experiments which are described, over 90% of the input power to such a... View full abstract»

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  • Use of surface integral equations for analysis of TM-induction problem

    Publication Year: 1974, Page(s):1109 - 1116
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (738 KB)

    The problem considered is that of evaluating the induced fields and the power loss in a long conductor with arbitrary cross-section placed in a time-harmonic transverse magnetic (TM) field. Hitherto, the problem has been analysed by numerically solving the governing differential equations or a volume-type integral equation. The paper presents a new approach which uses Helmholtz single-and double-l... View full abstract»

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  • Equivalent circuits from electromagnetic theory low-frequency induction devices

    Publication Year: 1974, Page(s):1117 - 1121
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (698 KB)

    A method is described for rearranging the electromagnetic-field-theory solutions of certain low-frequency devices into equivalent-circuit form. Two types of equivalent circuit are described, one `basic¿ the other `terminal¿. An equivalent circuit can aid the understanding of a device, and it also makes possible substantial saving in computer time. To illustrate the method, the equivalent circuit... View full abstract»

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  • Performance analysis of diecast multicage induction motors: a comparative study of two approaches

    Publication Year: 1974, Page(s):1122 - 1126
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    The paper presents a comparative study of the analysis of diecast double-cage induction motorsby single-cage/deep-bar approach and multicage-approach methods. In both the methods, saturation ofleakage flux paths and main flux paths have been considered. The performance of individual cages and saturation effects have been clearly brought out. The skin-effect ratios for the rotor, obtained by both t... View full abstract»

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  • Calculation of saturation effects in segmented-rotor reluctance machines

    Publication Year: 1974, Page(s):1127 - 1133
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (699 KB)

    There have been many recent developments in the design and analysis of segmented-rotor reluctance motors but no convenient method of allowing for the effects of saturation has been published. The paper presents a method of analysis based upon the simplifying assumption of a limiting value of radial airgap flux density. It is shown that, by means of the method presented, experimentally observed sat... View full abstract»

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  • Control of dual-excitation generator using derivatives of rotor angle

    Publication Year: 1974, Page(s):1134 - 1140
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (741 KB)

    The paper investigates the performance of a synchronous generator with two field windings, with separate voltage and angle regulators. The effects of continuous rotor velocity and acceleration feedback signals in the regulator loops are examined, and it is shown that different derivative gains must be used during steady-state and transient conditions to obtain the best performance. This is achieve... View full abstract»

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  • Extension of stable operating regions of synchronous machines using low-sensitivity excitation control

    Publication Year: 1974, Page(s):1141 - 1145
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (525 KB)

    In the usual design of optimal linear regulators for synchronous machines, the controller is designed for a particular set of system operating conditions. However, in actual system operation, these conditions are subject to load demands. Consequently, the optimal controller designed for a certain operating condition will no longer yield a satisfactory performance at others. The paper endeavours to... View full abstract»

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  • Improvements in phase-controlled circulating-current cycloconverter using communication principles

    Publication Year: 1974, Page(s):1146 - 1149
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    The paper demonstrates the application of communication techniques to improve the phase-controlle circulating-current cycloconverter. A modification to the existing cosinusoidal firing method is proposed which employs regular sampling instead of natural sampling. It is shown that this modification leads to a reduction in the magnitude of certain (low-frequency) harmonics that exist in the output w... View full abstract»

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  • Computerised linear control of a.c. generator power output

    Publication Year: 1974, Page(s):1150 - 1154
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (498 KB)

    The paper describes an online control system for regulating the power generation of an alternator that is connected to the supply Grid. The voltage, current and power factor of the a.c. generator are sampled and fed to the computer via analogue-digital convertors. The limits of the range of frequencies for sampling the input parameters to the computer are investigated, and an expression for the tr... View full abstract»

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  • Steady-state phase-variable model of the synchronous machine for use in 3-phase load-flow studies

    Publication Year: 1974, Page(s):1155 - 1164
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (972 KB)

    The derivation of a steady-state phase-variable model of the synchronous machine is considered for the purpose of investigating the influence of machine saliency on the unbalanced behaviour of powersystem networks. The model is particularly relevant as a means of representing the salient-pole generators of important hydroelectric stations feeding large and remote load centres. Application of the m... View full abstract»

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  • Computer-program description. Power-system dynamic-simulation program

    Publication Year: 1974, Page(s):1165 - 1167
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (319 KB)

    A special-purpose program is described for simulating power-system dynamic response. The program allows detailed study of the effects of generators, excitation systems and turbine-governor systems on power-system transient and dynamic stability. The main feature, which has been emphasised in the program design, is flexibility in the modelling of the generators and their controllers. The program is... View full abstract»

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  • Proposals for installation practice of single-core cables

    Publication Year: 1974, Page(s):1168 - 1174
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1042 KB)

    A review of installation techniques has been undertaken for single-core power cables employed in the cable networks of industrial plant. Particular attention has been given to the performance of trefoilcable groups under short circuit, and the influence of the consequential electromagnetic forces on the supporting and securing system used to hold the cables. For the investigation, a series of shor... View full abstract»

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  • Damping of aeolian vibration on overhead lines by vibration dampers

    Publication Year: 1974, Page(s):1175 - 1179
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (573 KB)

    A new method is presented for determining the effectiveness of dampers used to suppress aeolian vibration on overhead lines. The method is applied to a Stockbridge damper and a simple picture is presented of the way in which this damper works. A second type of vibration damper is also considered, to demonstrate the way in which the performance of different dampers can be evaluated and compared usi... View full abstract»

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  • Summary: Comparative performance of amplitude-comparator pilot-wire differential-protection systems

    Publication Year: 1974, Page(s):1180 - 1182
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (427 KB)

    A new relay circuit, applicable to asymmetrical pilot circuits, is described. In the steady state for relays at both ends, the circuit provides identical unit-diameter circular stability areas on the complex plane, centred on (1, 0), and it is suggested that this relay circuit constitutes a preferred characteristic of marginal operation. Certain alternative relay configurations are compared, to as... 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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