# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 29
• ### Statistical analysis of position-fixing general theory for systems with gaussian errors

Publication Year: 1972, Page(s):637 - 640
Cited by:  Papers (7)
| | PDF (507 KB)

The paper describes an extension of an earlier theory of position fixing in three dimensions, developed to permit the consideration of systems for which the positional errors of the position-fixing planes are not statistically independent. The general theory is based on the assumption that the position selected is the maximum likelihoodÂ¿ point, and relatively simple expressions are derived for t... View full abstract»

• ### Crab's-eye filter Novel synthesis procedure for sets of band-separation filters

Publication Year: 1972, Page(s):641 - 648
| | PDF (920 KB)

There are many applications in communication and instrumentation which require a bank of bandpass filters with adjacent passbands, such as telephone tone-signalling systems, Doppler-radar systems and speech-analysis systems. By use of the technique of crossconnected feedback, these may be realised using a lower average number of critical components per filter channel than by existing procedures. T... View full abstract»

• ### Fuel gauge for the electric car

Publication Year: 1972, Page(s):649 - 654
| | PDF (1033 KB)

The paper describes a simple device for recording the state of charge of the batteries of an electric vehicle. The device monitors the complete duty cycle, and switches off the charger when the batteries are fully charged. The principle of operation is based on integrated charge, rather than on battery terminal voltage. 15 prototype gauges have been fitted to preproduction vehicles, and a limited ... View full abstract»

• ### Thermal resistance of planar semiconductor structures

Publication Year: 1972, Page(s):655 - 658
Cited by:  Papers (1)
| | PDF (458 KB)

The heat flow across a substrate with a temperature-dependent thermal conductivity, such as is commonly encountered with planar semiconductor structures, is discussed. Analytic solutions are derived for an isothermal active-layer approximation, and numerical results are presented for a constant heat flux at the active-layer boundary. Important features of the flow of heat in the structures, such a... View full abstract»

• ### Cellular-array arithmetic unit with multiplication and division

Publication Year: 1972, Page(s):659 - 660
Cited by:  Papers (1)
| | PDF (259 KB)

A number of papers have been written recently describing cellular-array multipliers and dividers. The usefulness of these schemes is in their speed of operation and the simplicity of the array structures. However, the structures are such that multiplication and division require separate arrays and possibly different types of cells. Since the number of cells in an array is proportional to the squar... View full abstract»

• ### Excitation rectifier schemes for large generators

Publication Year: 1972, Page(s):661 - 671
Cited by:  Papers (5)
| | PDF (1148 KB)

Electric-power generators require field systems supplied by a direct current, and the use of d.c. exciters has, in general, been an obvious choice for units with a rating of up to 200 MW. As the ratings of generators increased, so did the excitation-power requirements, and it became clear that, if exciters were to be directly driven from the main generator shaft, the d.c. exciter was no longer the... View full abstract»

• ### Approach to the problem of ferroresonance in e.h.v. systems

Publication Year: 1972, Page(s):672 - 676
Cited by:  Papers (1)
| | PDF (580 KB)

An analytical analysis of ferroresonance with possible cases of its occurrence in series-and shunt-compensated systems is presented. A term percentage unstable zoneÂ¿ is defined to compare the jump severity of different nonlinearities. A direct analytical method has been shown to yield complete information. An attempt has been made to find all four critical points: jump-from and jump-to points of... View full abstract»

• ### Power-system studies for the determination of distance-protection performance

Publication Year: 1972, Page(s):677 - 688
Cited by:  Papers (2)
| | PDF (1682 KB)

The paper examines the limitations imposed by power-system performance on the measuring accuracy of distance relays, and, from this, indentifies the significant power-system conditions which contribute to the maintenance of satisfactory discriminating margins. The performance requirements thus established are initially related to the characteristics of present schemes of protection, and, from the ... View full abstract»

• ### Modelling of power-system protective equipment on analogue computers

Publication Year: 1972, Page(s):689 - 699
Cited by:  Papers (2)
| | PDF (1227 KB)

The transient performance of protective equipment is simulated under easily controlled conditions by means of specially constructed models. The models are developed in such a way that parameter variation of the protective system is easily achieved. The primary-fault currents necessary for testing the developed models are accurately generated using analogue computers. The design and testing of the ... View full abstract»

• ### Discussion on 'Behaviour of h.v. d.c. links under balanced-a.c.-fault conditions'

Publication Year: 1972, Page(s):700 - 703
| PDF (803 KB)
• ### Discussion on 'Divided-winding-rotor synchronous generator'

Publication Year: 1972
| PDF (158 KB)
• ### Induction-motor normalised stray loss with or without central rings in rotor cage

Publication Year: 1972, Page(s):705 - 708
| | PDF (454 KB)

An expression is derived for the bar plus interbar stray loss of a cage induction motor when conducting rings are equispaced between the endrings of the rotor. The parameters of the rotor are normalised on the basis of the per-unit bar reactance. In consequence, it is shown that a single family of characteristics can be derived for the stray loss so that it is applicable to any number of central c... View full abstract»

• ### Some aspects of effects of longitudinal and normal stress on power loss and flux distribution within a transformer core

Publication Year: 1972, Page(s):709 - 716
Cited by:  Papers (5)
| | PDF (849 KB)

An experimental 1.0 m Epstein square has been constructed in which all the limbs could be flattened to 1.5Ã105 N/m2 and two opposite limbs could be stressed longitudinally to Â±13.8Ã106 N/m2 Power-loss measurements were made on cores of 46-grade and 56-grade grain-oriented silicon-iron subjected to combinations of longitudinal and normal stress. The power loss (at 1.5 T) increased by only about ... View full abstract»

• ### Direct measurement of electric field at line conductors during a.c. corona

Publication Year: 1972, Page(s):717 - 723
Cited by:  Papers (8)
| | PDF (1091 KB)

An electrostatic-fluxmeter probe has been used to obtain a direct measurement of the electric field at a cylindrical conductor during a.c. corona. For conductor diameters of 1.59, 2 and 2.75 cm, the resultant electric field falls below the onset level for both positive and negative corona. For the positive discharge, the field becomes independent of the applied voltage, a maximum fall of 9%, being... View full abstract»

• ### Design features of auxiliary electrical machines for rolling stock

Publication Year: 1972, Page(s):724 - 733
| | PDF (1582 KB)

The paper is a review of some of the principal design features and the insulation methods relating to rotating auxiliary electrical machines used on both electric locomotives and multiple-unit stock. Items considered are (a) supply-motor generators (b) Carno convertors (c) exciter-motor generators (d) auxiliary motors. The trend towards alternators with rectifiers instead of d.c. generators is dis... View full abstract»

• ### IEE Southern Centre Eastern Area: Chairman's address. Insulating materialsÂ¿70 centuries of development

Publication Year: 1972, Page(s):733 - 734
| | PDF (179 KB)

First Page of the Article
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• ### Comparison of alternative skew-effect parameters of cage induction motors

Publication Year: 1972, Page(s):734 - 736
| PDF (410 KB)
• ### Decoupling multivariable systems by state feedback: sensitivity considerations

Publication Year: 1972, Page(s):737 - 742
Cited by:  Papers (1)
| | PDF (726 KB)

The paper considers the effect of parameter variations in a linear, time-invariant multivariable system x=Ax + Bu, y=Cx which can be decoupled into noninteracting single-input/single-output subsystems by state-variable feedback. Variations in the elements of the plant state matrix may cause the decoupled system either to (a) remain decoupled with altered subsystem transfer functions, (b) become re... View full abstract»

• ### Generalised Neustadt algorithm for minimum time control of linear systems with norm constraints on the controls

Publication Year: 1972, Page(s):743 - 751
| | PDF (1241 KB)

The problem of transferring a linear system between two closed sets in minimum time, when the control constraints can be formulated in terms of a norm on the control space, is treated. An algorithm for determining the optimal control is presented that is a significant improvement on current methods based on solving a sequence of minimum-effort problems. As an illustration, a 4th-order aircraft-lan... View full abstract»

• ### Time-series analysis of thyristor a.c. regulator

Publication Year: 1972, Page(s):755 - 757
| | PDF (577 KB)

Time-series methods are used to derive the characterising difference equations for a thyristor a.c. regulator when it is operating with single-term controllers. The regulator's stability and limit-cycling conditions are defined from these equations, and its observed response to an output disturbance is compared with the form of response predicted by these conditions. View full abstract»

• ### Filtering for linear distributed-parameter systems via boundary measurements

Publication Year: 1972, Page(s):757 - 759
Cited by:  Papers (1)
| PDF (285 KB)
• ### Pressurised-helium breakdown at very low temperatures

Publication Year: 1972, Page(s):760 - 765
Cited by:  Papers (22)
| | PDF (797 KB)

An extensive investigation of the electrical-breakdown behaviour of helium at very low temperatures has been carried out to assist the design and development of superconducting power cables. At very high densities, both liquid and gaseous helium showed an encouraging enhancement in electric strength when pressurised to a few atmospheres; conditioned values of breakdown fields then varied between 3... View full abstract»

• ### Erratum: Corporate financial models: a survey

Publication Year: 1972
| PDF (89 KB)
• ### Measurement of small dielectric loss at microwave frequencies

Publication Year: 1972, Page(s):767 - 770
Cited by:  Papers (4)
| | PDF (607 KB)

The dielectric loss of liquids or solids, which may be of the order of 100 Â¿rad, can be measured at frequencies of 10Â¿35 GHz by a bridge-like method. Liquid is admitted to a waveguide in one arm of the bridge, and its loss is determined from the change in attenuation with the change in length of the column of liquid; a solid specimen (which need not fill the guide) is measured by immersion in a ... View full abstract»

• ### IEE Mersey and North Wales Centre: Chairman's address. The engineer in society

Publication Year: 1972, Page(s):771 - 772
| | PDF (336 KB)

First Page of the Article
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## Aims & Scope

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

Full Aims & Scope