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# Electrical Engineers, Proceedings of the Institution of

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Displaying Results 1 - 25 of 25
• ### Simplified decoders for projective-geometry codes

Publication Year: 1978, Page(s):365 - 368
| | PDF (620 KB)

A simplified decoding method for projective-geometry codes is presented. The method is based on the mathematical structure of the null space. A detailed analysis of the mathematical structure of the null-space flats of the order-3 (63, 41) projective-geometry code is given and the associated decoder is discussed. Also, the order-5 (255, 218) projective-geometry code and its simplified decoder are ... View full abstract»

• ### Nature of space diversity in microwave communications via geostationary satellites: a review

Publication Year: 1978, Page(s):369 - 376
Cited by:  Papers (9)
| | PDF (1211 KB)

Space diversity (the simultaneous use through a common operations centre of two, or more, satellite receivers on the ground to overcome severe path attenuation that might occur on one of the links) is a well known concept and many measurements have been made to assess its potential advantages. The experimental results to date, however, show a large variability in space-diversity performance. The p... View full abstract»

• ### Erratum: Multi-aperture directional coupler using dissimilar transmission lines

Publication Year: 1978
| PDF (72 KB)
• ### Erratum: Multiport network analysis by matrix renormalisation: extension to four ports

Publication Year: 1978
| PDF (72 KB)
• ### Fundamental digital approach to the distance protection of e.h.v. transmission lines

Publication Year: 1978, Page(s):377 - 384
Cited by:  Papers (3)
| | PDF (1174 KB)

The basis of a new approach to the measurement of impedance, as used in the distance protection of transmission lines, is given. Digital processing is performed and it is shown that an extremely rapid and accurate indication of the circuit impedance can be effected by an online evaluation of the Fourier transform of a small section of the relaying waveforms. Results of an offline study of the resp... View full abstract»

• ### Automatic generation control of an interconnected power system

Publication Year: 1978, Page(s):385 - 390
Cited by:  Papers (48)
| | PDF (756 KB)

This paper investigates the stability and optimum settings of conventional automatic generation controllers for an interconnected power system having reheat steam plants. Effective application of the parameter-plane technique for obtaining optimal controller setting and sensitivity analysis has been demonstrated. Rigorous sensitivity analysis reveals that reserve of stability and optimum controlle... View full abstract»

• ### Factors influencing the formation and structure of fuse fulgurites

Publication Year: 1978, Page(s):391 - 399
Cited by:  Papers (2)
| | PDF (1240 KB)

Cartridge fuselinks rely upon the properties of the arcs initiated after melting to ensure satisfactory interruption of fault currents. Factors which influence the properties of fuse arcs and subsequent formation of fulguritesÂ¿ are described in this paper. Attempts are made to include parameters not only attributable to the physics of the arc column itself, but also those having a relationship t... View full abstract»

• ### Multispeed induction motor fed from a switched single-phase supply

Publication Year: 1978, Page(s):400 - 406
| | PDF (812 KB)

A relatively simple naturally-commutated switching system is described which enables a polyphase a.c. motor to be operated as a speed-changing single-phase motor. A single-phase supply, of fixed frequency, is converted to a polyphase supply consisting mainly of a complementary pair of adjustable component frequencies. When supplied to a polyphase winding, an alternating m.m.f. is produced, the spe... View full abstract»

• ### Is saturation a blessing in disguise?

Publication Year: 1978, Page(s):407 - 410
| | PDF (475 KB)

The patent by J. and J. Jarret caused quite a stir among engineers owing to the somewhat surprising claim that the performance of reluctance machines could be enhanced by the deliberate introduction of saturated zones, e.g. by way of reduction of iron at appropriate places in the magnetic circuit. Lawrenson et al. recently reported on experiments to examine this matter. It is, however, still not c... View full abstract»

• ### Analysis of modulation processes in power convertors

Publication Year: 1978, Page(s):411 - 412
Cited by:  Papers (1)
| | PDF (275 KB)

A novel approach to the analysis of modulation processes in power convertors is developed. The single harmonic components of the modulator output spectrum are given in terms of series with fast convergence rate. The method set forth is based on the theory of the Kapteyn series. Both the cases of rational and irrational frequency ratio are treated and some typical peculiarities of the modulation pr... View full abstract»

• ### State-space computer triac model

Publication Year: 1978, Page(s):413 - 415
Cited by:  Papers (2)
| | PDF (284 KB)

The paper presents a state-space dynamic model for a bidirectional silicon controlled rectifier (the triac). The model exhibits programmable and controllable static and dynamic properties for a triac in all four modes of electrical operation. Computer-simulated transient electrical results of a pulse-width modulated a.c. chopper are in excellent agreement with results obtained experimentally. View full abstract»

• ### Novel disc-motor designs

Publication Year: 1978
Cited by:  Papers (1)
| PDF (118 KB)
• ### Erratum: Some new solutions to ferro-resonance problem in power system

Publication Year: 1978
Cited by:  Papers (1)
| PDF (117 KB)
• ### Erratum: Performance and testing of multi-unit circuit breakers switching low inductive currents

Publication Year: 1978
| PDF (117 KB)
• ### Synthesis of inductive displacement-measuring system using computer-aided design

Publication Year: 1978, Page(s):417 - 421
Cited by:  Papers (3)
| | PDF (603 KB)

A rigorous method used to model linear variable differential transformers (l.v.d.t.s) is applied to a variable-inductance displacement transducer. This method known as field modellingÂ¿ uses a knowledge of the magnetic flux distribution within the transducer. This flux distribution is obtained from the solution of Maxwell's equation, with boundary conditions deriving from the geometry and materia... View full abstract»

• ### Variance of the estimate of amplitude distributions

Publication Year: 1978, Page(s):422 - 424
| | PDF (369 KB)

The paper considers the variance of experimental estimates of the amplitude probability density function due to finite record length. Analysis, assuming a normally distributed signal, is presented for both a sampled record appropriate for digital experimental procedures and for the case of a continuous record of relevance to analogue analysis. Particular attention is given to the influence of the ... View full abstract»

• ### Random versus pseudorandom test signals in nonlinear-system identification

Publication Year: 1978, Page(s):425 - 428
| | PDF (578 KB)

The crosscorrelation method of nonlinear-system identification, by use of quasiwhite test signals, is one of the most powerful approaches to the black-box identification problem. The increasing popularity of the method in applications of physical and physiological systems has raised the question of optimality in the selection of the appropriate quasiwhite test signal. Two families of quasiwhite si... View full abstract»

• ### Robust decentralised controller for linear-interconnected dynamical systems

Publication Year: 1978, Page(s):429 - 432
Cited by:  Papers (2)
| | PDF (382 KB)

In this paper we develop an entirely new approach to the solution of the decentralised control problem for large-scale linear-interconnected dynamical systems. We provide a simple reduced-order model for the interactions, and, using this interaction model, we compute a decentralised controller whose parameters are independent of the initial states and which can accommodate unknown constant externa... View full abstract»

• ### Fast Mersenne-prime transforms for digital filtering

Publication Year: 1978, Page(s):433 - 440
Cited by:  Papers (4)
| | PDF (749 KB)

It is shown that Winograd's algorithm can be used to compute an integer transform over GF(q), where q is a Mersenne prime. This new algorithm requires fewer multiplications than the conventional fast Fourier transform (f.f.t). The transform over GF(q) can be implemented readily on a digital computer. This fact makes it possible to more easily encode b.c.h. and r.s. codes. View full abstract»

• ### Minimum variance control, estimation and simulation of nonlinear models of wastewater-treatment systems

Publication Year: 1978, Page(s):441 - 446
| | PDF (805 KB)

A problem of increasing importance is that of efficient regulation of wastewater-treatment systems. In the paper a set of model equations for the activated-sludge process are derived and shown to be nonlinear. These are ItÃ¿ stochastic differential equations for which analytic solutions are not tractable. A 1st-order simulation algorithm based on the properties of ItÃ¿ calculus is used to validate... View full abstract»

• ### Wider application of multipass systems theory. Part 1: Multimachine and multicell systems

Publication Year: 1978, Page(s):447 - 452
Cited by:  Papers (2)
| | PDF (677 KB)

A general time-(distance-) domain representation of unidirectional multipass processes is presented which describes all previously identified examples.1 It is then shown that systems of multiple machines in which the signal flow is unidirectional could be simulated by the repeated simulation of a single machine, and that such a procedure is described by the same general time-domain formulation. Th... View full abstract»

• ### Wider application of multipass systems theory. Part 2: Controlled distributed processes

Publication Year: 1978, Page(s):453 - 459
Cited by:  Papers (2)
| | PDF (757 KB)

Multipass-systems theory is applied to the stability analysis of distributed processes subject to nonlocal feedback control and involving counterflow phenomena resulting from mixed boundary conditions. This is achieved by discretising the process in space and time to produce a model (such as might be used for elementary numerical solution) involving a sequence of bidirectional spatial sweeps of th... View full abstract»

• ### Air-cored foil-wound inductors

Publication Year: 1978, Page(s):460 - 464
Cited by:  Papers (2)
| | PDF (633 KB)

The inductance value of a foil-wound inductor is equal to that of a similar wire-wound inductor at low frequencies, but as the frequency rises, the foil inductance decreases by about 10% because of current redistribution across the foil width. A table and a formula for d.c. inductance values are given. The occurrence of a first resonance frequency due to intertum capacitance is explained and an ap... View full abstract»

• ### Sinusoidal and transient response of coaxial current shunts

Publication Year: 1978, Page(s):465 - 466
| | PDF (208 KB)

An analysis is given for the current density distribution in a coaxial current shunt. The device is modelled using nonuniform transmission-line analogy to yield an equivalent circuit. Hence the steady-state and transient behaviour can be predicted. Bessel functions are no longer required for this type of problem. View full abstract»

• ### Some characteristics of negative point-plane corona

Publication Year: 1978, Page(s):467 - 468
Cited by:  Papers (4)
| | PDF (227 KB)

Some electrical characteristics of negative point-plane corona discharges are described for oxygen, air, carbon dioxide and sulphur hexafluoride at pressures of 10, 20 and 30 torr. 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