# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 33
• ### 'Wild' bearings in high-frequency direction finding

Publication Year: 1975, Page(s):337 - 339
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In high-frequency direction finding there occur, not infrequently, bearing errors which substantially exceed those normally experienced. It is customary to refer to bearings that are found to be very wide of the mark as 'wild'. Since one exceptionally large error in a small group of bearings apparently has a disproportionate effect on the overall result, attempts have been made from time to time t... View full abstract»

• ### Use of the numerical phase-difference filter for the digital channel bank

Publication Year: 1975, Page(s):340 - 344
Cited by:  Papers (3)
| | PDF (445 KB)

The use of the numerical phase-difference filter in the single-sideband modulation scheme for frequency-division multiplexing is investigated and compared with the Weaver-modulator scheme proposed by Freeny et al. A simple algebraic solution to the approximation problem for arbitrary specifications in the stopband is given. The sensitivity of the stopband attenuation is the main problem that precl... View full abstract»

• ### Inductive detection of underground metallic pipes

Publication Year: 1975, Page(s):345 - 348
Cited by:  Papers (2)
| | PDF (494 KB)

A widely used instrument for locating underground metallic pipes consists of two coils: one of which (the transmitting coil) excites eddy currents in the pipe, and the other (the receiving coil) detects the magnetic field of. these eddy currents. Irregularities in the response of this type of instrument appear during certain search operations. These irregularities cause uncertainty about the posit... View full abstract»

• ### Synthesis of a single null response in an otherwise omnidirectional pattern using a circular array

Publication Year: 1975, Page(s):349 - 352
Cited by:  Papers (5)
| | PDF (523 KB)

The paper discusses a method for designing an antenna array having an omnidirectional pattern in the horizontal plane plus a single steerable null. Such a system has applications in communications when it is required to reject interfering signals from an unwanted source, while maintaining communication coverage in other directions. Parameters such as null width, null depth and the gain ripple in t... View full abstract»

• ### IEE South-Western Area: Chairman's address. Computers and the arts

Publication Year: 1975
| | PDF (124 KB)

First Page of the Article
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• ### Method of tuning dipoles using capacitors and variable-capacitance diodes

Publication Year: 1975, Page(s):353 - 357
Cited by:  Papers (1)
| | PDF (672 KB)

A method of tuning dipoles using discrete capacitors is presented with a theoretical model and experimental verification. Two or more capacitors are placed at various points across the two wires of a folded dipole to cancel the reactive part of the driving-point impedance for single-frequency tuning. Variable-capacitance diodes can be used in place of the capacitors to tune a dipole over a very wi... View full abstract»

• ### Gain degradation of a 25 m paraboloidal aerial on 2 GHz transhorizon radio paths

Publication Year: 1975, Page(s):358 - 360
| | PDF (445 KB)

The apparent loss of gain referred to as gain degradationÂ¿, or aperture-medium coupling lossÂ¿, is normally severe on high-gain aerials when used on tropospheric scatter (beyond line-of-sight) radio paths. The paper reports measurements made using a 25 m-diameter paraboloidal aerial on two 300 km troposcatter radio paths at 2 GHz, compares these with data previously published, and emphasises th... View full abstract»

• ### Intermodulation products from nonlinearities in transmission lines and connectors at microwave frequencies

Publication Year: 1975, Page(s):361 - 367
Cited by:  Papers (19)
| | PDF (773 KB)

An experimental investigation of intermodulation products generated by nonlinear effects at contacts between similar and dissimilar metals has been carried out, and the results are reported and discussed here. Seven contact materials were used, and the effects of oxidation and electroplating of contacts were observed. Measurements of 3rd-order (2fA-fB) and 5th-order (3fA-2fB) intermodulation produ... View full abstract»

• ### Crosscorrelation method for analysing phase and gain errors in p.c.m. systems for colour television

Publication Year: 1975, Page(s):367 - 368
Cited by:  Papers (1)
| PDF (282 KB)
• ### Large transient neutral currents during energisation of 3-phase transformers

Publication Year: 1975, Page(s):369 - 372
| | PDF (471 KB)

A magnetising inrush phenomenon characterised by a large exponentially decaying direct component of current in the neutral has been recorded in a number of 275 kV transformers. Laboratory investigations have shown that the effect can be produced in 3-limb transformers with certain combinations of nonsimultaneous energisation of the three phases. In particular, for the first two limbs to have their... View full abstract»

• ### Determination of surge-diverter voltage/current characteristic

Publication Year: 1975, Page(s):373 - 376
Cited by:  Papers (1)
| | PDF (413 KB)

A mathematical model has been proposed to determine the voltage/current characteristic of the surge diverter for a wide range of currents of short duration of 8/20 and 4/10Â¿s waveshapes. Experimental data agree well with the proposed model. View full abstract»

• ### Airgap and stator flux distribution in Guy-type medium-frequency inductor generators

Publication Year: 1975, Page(s):377 - 386
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The first part of this paper is concerned with no-load permeance variations and overall flux distribution in the airgap of Guy-type inductor alternators. Teledeltos models were used to predict the permeance variation over a rotor pitch and over a whole stator main tooth for a complete cycle. The flux utilisation coefficient calculated from the permeance variation across a whole main tooth gave a b... View full abstract»

• ### Rotor flux distribution in Guy-type medium-frequency inductor alternators

Publication Year: 1975, Page(s):387 - 391
| | PDF (526 KB)

The paper discusses flux distribution in the rotor teeth and core of a 44.4 kVA Guy-type inductor alternator. Flux measurements, made under open-circuit and load conditions, showed the similarity between stator and rotor flux waveforms over a rotor pitch, modified by the heteropolar flux which links the rotor teeth and core. For any given load condition, the flux waveforms on the rotor can easily ... View full abstract»

• ### Demagnetisation phenomena in high-performance d.c. servomotors

Publication Year: 1975, Page(s):392 - 394
| | PDF (378 KB)

The paper describes the experimental results obtained from mounting Hall plates in the airgap of a high-performance permanent-magnet d.c. machine. It is found that the flux-density distribution over the pole face during transient operating conditions is nonuniform. These results suggest that the conventional single-recoil-line theory is deficient, and that each point on the surface of the permanen... View full abstract»

• ### Modern cable-fault-location methods

Publication Year: 1975, Page(s):395 - 402
Cited by:  Papers (6)
| | PDF (1063 KB)

The modern method of effective cable-fault location is to establish an approximate fault locality and then to accurately confirm the fault position. The paper reviews fault-location methods developed over the past few years, these have proved to be very accurate and generally quicker than classical methods. The main causes of failure are analysed and, since the majority of cable faults occur on th... View full abstract»

• ### Cable-fault location by impulse-current method

Publication Year: 1975, Page(s):403 - 408
Cited by:  Papers (13)
| | PDF (766 KB)

The paper presents a new approach to cable-fault location based on the use of high-voltage impulse generators. It is shown that, when an impulse generator is connected onto a faulty cable, the waveform of the generator output current can be used to determine the position of a fault. Several advantages are gained by the use of a linear coupler to provide the signal to the instrumentation, and it is... View full abstract»

• ### Control of power on a large diesel-electric locomotive of new design

Publication Year: 1975, Page(s):409 - 413
| | PDF (684 KB)

To control the power of a large locomotive effectively the driver must be provided with some form of automatic control of tractive effort and engine power. This must ensure that the engine is never overloaded, and that the most efficient use is made of the available adhesion. Some details of load control are discussed from a stability point of view, and ways and means of using the available power ... View full abstract»

• ### Optimisation of static-capacitor installations and switching schedules in distribution systems

Publication Year: 1975, Page(s):415 - 420
| | PDF (644 KB)

In distribution systems, static-capacitor banks are installed to reduce energy losses and to achieve voltage correction. The determination of the sizes and locations of the capacitor installations is formulated as an optimisation problem in the paper. The objective function is taken to be the sum of the annual cost of energy loss and the annual cost of additional capacitor installations. To schedu... View full abstract»

• ### Discussion on "Power-system model for large frequency disturbances"

Publication Year: 1975, Page(s):418 - 429
| PDF (551 KB)
• ### Simplified stability analysis of a distribution system in a chemical plant with induction motors

Publication Year: 1975, Page(s):421 - 429
| | PDF (887 KB)

The need for a simple method of stability analysis has become apparent now that the problem of voltage-dip protection is often encountered. Simplifying assumptions such as approximate vector addition, neglecting motorfault contributions and transients, are explained. The stability of a typical plant after a voltage dip is then calculated by slide rule using only motor torque/slip and current/slip ... View full abstract»

• ### Discussion on 'Balanced synthetic circuit: new circuit for high-power testing with low-frequency transient recovery voltage'

Publication Year: 1975, Page(s):427 - 429
| PDF (516 KB)
• ### New combination: motor-levitator

Publication Year: 1975, Page(s):430 - 431
Cited by:  Papers (1)
| PDF (290 KB)
• ### Vernier reluctance motor

Publication Year: 1975
| PDF (172 KB)
• ### Voltage-time integral method of inductance measurement

Publication Year: 1975, Page(s):431 - 432
Cited by:  Papers (1)
| PDF (278 KB)
• ### Erratum: Representaion of magnetic characteristic, including hysteresis, by exponential series

Publication Year: 1975
| PDF (113 KB)

## Aims & Scope

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

Full Aims & Scope