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# Electrical Engineers, Proceedings of the Institution of

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Displaying Results 1 - 25 of 28
• ### Comparisons of category scales employed for opinion rating

Publication Year: 1974, Page(s):785 - 793
| | PDF (1328 KB)

Comparisons have been made between three category scales that have been used for the laboratory assessment of impaired television pictures. Two of the scales, comprising 5 and 6 grades, respectively, are concerned with assessment of the quality of the picture; the third is a 6-grade scale concerned with assessment of the amount of impairment in the picture. In one group of tests, observers assesse... View full abstract»

• ### Numerical comparison of the Green's function and the Waterman and Rayleigh theories of scattering from a cylinder with arbitrary cross-section

Publication Year: 1974, Page(s):794 - 804
Cited by:  Papers (6)
| | PDF (1236 KB)

Until now much has been published of a theoretical nature concerning the validity or invalidity of the Rayleigh and Waterman methods for evaluating the field scattered from isolated perfectly conducting cylinders of arbitrary shape; however, little of conclusive, concrete nature has ensued. In the paper we propose to establish the conditions (if any) under which these methods may be employed with ... View full abstract»

• ### Approximate method of calculating the radiation pattern of a corner-reflector antenna

Publication Year: 1974, Page(s):805 - 806
| | PDF (214 KB)

The known surface currents in a corner reflector having infinite-length sides are used as approximations to the surface currents in a finite corner reflector, to calculate a radiation pattern. It is shown that this approximation results in nearly zero tangential electric field at the surface of the reflectors, so that the assumed surface currents can be expected to be good approximations to actual... View full abstract»

• ### Computer-controlled queuing system with switching network

Publication Year: 1974, Page(s):807 - 812
| | PDF (600 KB)

The paper presents a detailed study of a computer-controlled queuing system with a switching network. A generating function for the state probabilities of the system and a necessary and sufficient condition for the existence of statistical equilibrium for the system are derived. Further, a formula for the determination of the waiting-time distribution in the system is obtained by the use of the th... View full abstract»

• ### Computer peripheral for image data

Publication Year: 1974, Page(s):813 - 815
Cited by:  Papers (1)
| | PDF (451 KB)

A computer peripheral for the input of grey scale image data is described. Four versatile modes of operation provide flexibility in the collection of data sequentially or at random. A standard t.v. camera with an interlaced raster is used as the image transducer. The composite video signal produced by the camera provides all the information necessary for the peripheral interface circuitry. The per... View full abstract»

• ### Discussion on 'Intermodulation interference in mobile multitransmission communication systems operating at high frequencies (3-30 MHz)'

Publication Year: 1974, Page(s):815 - 816
| PDF (308 KB)
• ### Distance-protection comparator with signal-dependent phase-angle criterion

Publication Year: 1974, Page(s):817 - 825
| | PDF (1045 KB)

Contemporary methods of providing specially shaped relay characteristics, i.e. other than the familiar circular and straight-line types, are assessed, particularly from the point of view of relay performance and complexity. A new method of shaping is established in which the phase-angle criterion of the block-average type of comparator is a function of the primary system quantities and is therefor... View full abstract»

• ### New mathematical model for current transformers

Publication Year: 1974, Page(s):826 - 828
| | PDF (298 KB)

For the complete transient analysis of any protective scheme, knowledge of the dynamic behaviour of the current transformer (c.t.) is necessary. Thus, an accurate model to represent the current transformer requires careful consideration. In this paper, a new mathematical model to simulate the exciting circuit is reported. Some of the earlier models used have been discussed, and the advantages of t... View full abstract»

• ### Fail-safe earth-fault-detection device for battery supplies

Publication Year: 1974, Page(s):829 - 830
| | PDF (282 KB)

An electronic method for detecting an earth fault on a fully insulated battery system that fails to safety in the event of supply, component or connection failure, is described. The particular application to battery-driven coal-mine locomotives is discussed, and a device recently built and tested by the authors for this purpose is described in detail. The device is such that intrinsic safety for m... View full abstract»

• ### Applications of a synchronous-machine circuit model

Publication Year: 1974, Page(s):831 - 832
| | PDF (241 KB)

A circuit model of a synchronous machine offers ease of formulation of the state equations and eliminates the need to invert the inductance matrix at every step during a digital simulation. The effects of fast-acting excitation control on the stability of a system are studied as an example and an exact analysis of a system containing two synchronous machines connected through a short transmission ... View full abstract»

• ### Unified control for synchronous-machine stabilisation

Publication Year: 1974, Page(s):833 - 839
Cited by:  Papers (1)
| | PDF (545 KB)

This paper describes the theory and procedure for the design of a unified control to improve the stability of a synchronous machine whenever a major disturbance occurs. Using a nonlinear state-space model in directphase quantities, a direct-optimisation technique has been used to derive the unified controls that are effective for the most common types of balanced and unbalanced faults. Practical c... View full abstract»

• ### Transformer multiflow hottest-spot rating: proposed standard specification

Publication Year: 1974, Page(s):840 - 844
Cited by:  Papers (2)
| | PDF (601 KB)

The present practice in thermal rating is reviewed with recognition of its defects and limitations, of which the most serious is its inability to relate the standard rating with the hottest-spot temperature (h.s.t.). Modern improvements in cooling reduce the h.s.t., but are circumscribed by these limitations. The multiflow principle allows the h.s.t. to be determined for each individual winding fr... View full abstract»

• ### Effects of mechanical and aerodynamic damping on the galloping of overhead lines

Publication Year: 1974, Page(s):845 - 848
| | PDF (520 KB)

This paper examines theoretically the effects that mechanical and aerodynamic (drag) dampers can have on the amplitudes of the bulk galloping oscillations of overhead lines. The oscillation amplitudes are calculated using an energy-balance method and the results are presented in a way that allows the two types of damper to be compared. It is shown that, for lines with small vertical phase spacings... View full abstract»

• ### Modified form of Newton's method for faster load-flow solutions

Publication Year: 1974, Page(s):849 - 853
Cited by:  Papers (3)
| | PDF (573 KB)

A modified form of Newton's method for load flow is introduced in this paper. The results tabulated, for eight different power systems, indicate a consistent advantage in using this modification over the standard Newton method. The comparisons are made on systems that include several for which load-flow results were previously published by other authors. View full abstract»

• ### Discussion on 'Interactive design of electricity-distribution networks'

Publication Year: 1974, Page(s):853 - 854
| PDF (392 KB)
• ### Discussion on 'Degradation mechanisms of mechanical connectors on aluminium conductors'

Publication Year: 1974, Page(s):855 - 859
| PDF (1081 KB)
• ### Discussion on "Transient recovery voltage and thermal performance of an airblast circuit breaker"

Publication Year: 1974, Page(s):860 - 861
| PDF (361 KB)
• ### Discussion on 'Analysis of d.c. chopper circuits by computer-based piecewise-linear technique'

Publication Year: 1974, Page(s):862 - 864
| PDF (543 KB)
• ### Voltage surges induced on overhead lines by lightning strokes

Publication Year: 1974, Page(s):864 - 865
| PDF (142 KB)
• ### Linear prediction model of speech production with applications to deaf speech training

Publication Year: 1974, Page(s):865 - 873
Cited by:  Papers (10)
| | PDF (952 KB)

The linear prediction model of speech production is reviewed and its various formulations are related. Algorithms are presented for efficient fixed-point analysis and synthesis, together with their execution times, on a small computer. The properties of the model are discussed, and the acoustic-tube analogue is developed. This forms the basis of a system currently being used for deaf speech traini... View full abstract»

• ### Pole assignment by means of unrestricted-rank output feedback

Publication Year: 1974, Page(s):874 - 878
Cited by:  Papers (2)
| | PDF (511 KB)

The problem of pole assignment in linear, multivariable systems using an unconstrained-rank feedback matrix is considered. The effect of output feedback of unspecified rank on the characteristic polynomial of a multivariable system is first studied. The results are then used to derive a recursive algorithm for pole assignment without any restrictions on the rank of the output feedback matrix used.... View full abstract»

• ### Suboptimal control of linear systems via simplified models of Chidambara

Publication Year: 1974, Page(s):879 - 882
Cited by:  Papers (7)
| | PDF (334 KB)

A method is developed for using simplified models, developed by Chidambara, for deriving suboptimal controllers to the original higher-order systems. An equivalent performance criterion has been developed, which is to be used in conjunction with the simplified models to derive the suboptimal controllers. The method developed is also useful when some of the state variables are not accessible for me... View full abstract»

• ### Synthesis of a class of nonlinear systems in multidimensional frequency domain

Publication Year: 1974, Page(s):883 - 885
| | PDF (232 KB)

The paper presents a method of synthesis for a class of nonlinear systems characterised by Volterra functional series. A canonic form is introduced that permits the system kernels to be realised by a finite number of multipliers and 1st-and 2nd-order linear systems. The method of synthesis is illustrated by synthesising the Volterra kernel of a ring-multiplier circuit. View full abstract»

• ### Three-stage near-optimum design of nonlinear-control processes

Publication Year: 1974, Page(s):886 - 892
| | PDF (705 KB)

A systematic near-optimum design technique for the control of nonlinear-control processes is presented. The method consists of three stages. In the first stage, called subprocess decouplingÂ¿, coupling is neglected between two or more subsystems, thus reducing the process to a set of weakly coupled subprocesses. The second stage is to represent each subprocess by slowÂ¿, basicÂ¿ and fastÂ¿ mod... View full abstract»

• ### Online computer control of an evaporation process

Publication Year: 1974, Page(s):893 - 898
| | PDF (827 KB)

The paper describes the application of single-input/single-output discrete linear-control theory to control the evaporation of various dielectric material in a vacuum chamber. The process is modelled using a recursive least-squares method and a controller is designed from the model. Process nonlinearity is shown to inhibit the performance of linear feedback control. A compensation is introduced to... View full abstract»

## Aims & Scope

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

Full Aims & Scope