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Electrical Engineers, Proceedings of the Institution of

Issue 10 • Date October 1972

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Displaying Results 1 - 20 of 20
  • New definitions for loudness ratings

    Publication Year: 1972 , Page(s): 1429 - 1441
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1796 KB)  

    Loudness ratings of local telephone circuits are essential quantities in planning national telephone networks and in co-ordinating international telephony. At present, these have to be obtained by subjective testing, which is laborious, expensive and not readily reproducible except in particularly well equipped laboratories. Methods are also available (and in use for certain purposes) for obtainin... View full abstract»

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  • Application of pulse-code modulation to sound-signal distribution in a broadcasting network

    Publication Year: 1972 , Page(s): 1442 - 1448
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1317 KB)  

    The application of digital methods to the internal distribution of high-quality sound signals in a broadcasting system allows a high and predictable standard of technical quality to be maintained with the minimum of attention by operating staff. Pulse-code-modulation systems for the incorporation of a sound signal into a video waveform and for the multiplex distribution of programmes for the radio... View full abstract»

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  • Chain parameters of regular nonuniform transmission lines

    Publication Year: 1972 , Page(s): 1449 - 1451
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (249 KB)  

    The chain parameters of five well known regular nonuniform transmission lines (n.u.t.l.s) are evaluated. In these evaluations, the differential interrelations among the chain parameters of the n.u.t.l.s. in the form of 2nd-order matrix differential equations with their boundary conditions are employed. The method used is applicable to any nonuniformity, provided that the 2nd-order differential equ... View full abstract»

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  • Cellular logic array for redundant binary division

    Publication Year: 1972 , Page(s): 1452 - 1456
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (453 KB)  

    The logic cellular array of a division device that is based on the SRT division algorithm extended to the case of redundant representation of the partial remainders is reported. In the paper, redundant binary representation of the partial remainders is due to the fact that any digit can have the following values: minus one (1), zero (0) and plus one (1). Comparison of the logic array proposed with... View full abstract»

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  • Predistorted singly and doubly terminated 0.01 dB-ripple 1st-kind Cheby¿shev filters

    Publication Year: 1972 , Page(s): 1457 - 1462
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (583 KB)  

    Existing synthesis techniques are utilised to develop Tables of low-pass prototype element `g¿ values of predistorted singly and doubly terminated first-kind 0.01 dB-ripple Cheby¿shev-filter networks with up to nine sections. Through conventional frequency-transformation techniques, corresponding bandpass circuits can also be realised. Excessive predistortion (low Q factor) will deteriorate the ... View full abstract»

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  • Effect of envelope limiting in pulse-compression moving-target-indicator radar systems

    Publication Year: 1972 , Page(s): 1463 - 1464
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (294 KB)  

    Computer simulations are used to study the effect of envelope limiting on the performance of pulse-compression moving-target-indicator (m.t.i.) radar in the presence of clutter produced by stationary reflectors and nonstationary reflectors. It is shown that the use of pre-envelope concepts to deal with bandpass processes as complex lowpass envelopes enables efficient use to be made of high-speed f... View full abstract»

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  • Scattering parameters of an arbitrarily shaped aperture in a waveguide

    Publication Year: 1972 , Page(s): 1465 - 1466
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (258 KB)  

    An arbitrarily shaped aperture in the wall of a uniform waveguide of unspecified cross-section has been analysed in terms of its scattering and radiating properties, using variational techniques. The method is of general application, the principal requirement being that the Green's functions for the waveguide and the external medium or structure should be known. Attention is focused particularly o... View full abstract»

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  • Scaling laws for the interaction of a gas-blast circuit-breaker arc with an electric circuit

    Publication Year: 1972 , Page(s): 1469 - 1476
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (792 KB)  

    Nondimensional variables are described that take account of changes in flow geometry, gas velocity and pressure and arc current on the behaviour of axial-flow forced-convection arcs. Calculated steady-state characteristics are shown that are in good agreement with measurements made in nitrogen gas. An elementary theory is presented for the dynamic arc in nozzle flow that agrees qualitatively with ... View full abstract»

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  • Calculating the influence of the circuit breaker on overvoltage probability distributions

    Publication Year: 1972 , Page(s): 1477 - 1482
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (799 KB)  

    Small changes in element parameters which can be caused by manufacturing tolerances, wear, aging, and maintenance can cause significant changes in the overvoltage performance of a power system in which they are incorporated. To study the effect of such dispersion on the performance, a computer-controlled transient-network analyser capable of rapid, accurate estimation of overvoltage-probability di... View full abstract»

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  • System and load behaviour following loss of generation. Experimental results and evaluation

    Publication Year: 1972 , Page(s): 1483 - 1486
    Cited by:  Papers (6)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (516 KB)  

    The paper describes tests involving sudden loss of generation on an isolated power system of more than 2000 MW installed capacity. Amounts of generation ranging from 3% to 27% of the system total were disconnected, causing voltage depression and frequency excursions. The maximum transient frequency drop recorded was 3.25 Hz. During the tests, measurements were made simultaneously at six different ... View full abstract»

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  • Discussion on ¿Results of stability tests on an underexcited 120 MW generator¿

    Publication Year: 1972 , Page(s): 1487 - 1494
    Save to Project icon | PDF file iconPDF (1137 KB)  
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  • Discussion on ¿Behaviour of m.v. power-distribution cables when subjected to external damage¿

    Publication Year: 1972 , Page(s): 1495 - 1498
    Save to Project icon | PDF file iconPDF (783 KB)  
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  • Unipolar induction braking of thin metal sheets

    Publication Year: 1972 , Page(s): 1499 - 1503
    Cited by:  Papers (6)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (463 KB)  

    The eddy currents due to the motion of a thin conducting strip in the airgap of a d.c.-excited electromagnet are analysed. This permits determination of the braking force exerted on the sheet. A general method for this type of problem is outlined. The current streamlines are shown, and a specific numerical example is given. The results should be of interest in view of the widespread use of electro... View full abstract»

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  • Analysis of phase-sequence detector for polyphase distance relay

    Publication Year: 1972 , Page(s): 1503 - 1504
    Cited by:  Papers (1)
    Save to Project icon | PDF file iconPDF (188 KB)  
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  • Sequence control of analogue computers

    Publication Year: 1972 , Page(s): 1505 - 1509
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (684 KB)  

    Parallel-logic programming of analogue computers often presents difficulties to all but the most experienced users. The paper describes an inexpensive method of simplifying the control of iterative problem solutions run on parallel-logic analogue computers by employing a special-purpose sequence controller. The controller stores up to 16 64 bit words, which are transferred in sequence to an output... View full abstract»

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  • Rapid solution of Orowan's equations using a hybrid computer

    Publication Year: 1972 , Page(s): 1510 - 1516
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (716 KB)  

    This paper describes a method of obtaining a rapid solution of Orowan's equations using a hybrid computer complex. A PDP8 4 K-store digital computer, an analogue computer and associated interface provide the necessary hybrid system. The normal approach to Orowan's equations is to obtain values of roll force and torque for a known reduction, with no reference to such mill constants as mill elastici... View full abstract»

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  • Series compensation of servodrive resonance

    Publication Year: 1972 , Page(s): 1517 - 1520
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (358 KB)  

    The paper considers the effects of the locked-rotor frequency in a range of servodrives. The methods of compensating for the resonance are discussed, and suitable active filters are designed to compensate for the resonance. Practical results of filter circuits are given. View full abstract»

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  • Evaluation of response of nonlinear discrete systems using multidimensional Z transforms

    Publication Year: 1972 , Page(s): 1521 - 1525
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (389 KB)  

    Using the concept of a multidimensional Z transform, a method for solving time-invariant nonlinear difference equations is proposed. The solution is obtained in the form of a discrete Volterra series. Using the new technique, the response of a nonlinear sampled-data control system is obtained which compares very favourably with that obtained by other, more tedious and cumbersome, methods. View full abstract»

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  • Erratum: Output-feedback control law for randomly disturbed multivariable system

    Publication Year: 1972
    Save to Project icon | PDF file iconPDF (36 KB)  
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  • Breakdown of series-connected airgaps

    Publication Year: 1972 , Page(s): 1526 - 1528
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (302 KB)  

    The breakdown characteristics of two rod-rod airgaps in series have been measured. The effects on the values of V50 and ¿ have been determined as a function of the length of the first rod-rod gap, the polarity of the applied voltage, the capacitance to earth of the centre electrode and the time to peak of the applied impulse. The results have been compared with those for a single rod-rod airgap o... 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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