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Electric Power Applications, IEE Proceedings B

Issue 6 • Date November 1980

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Displaying Results 1 - 9 of 9
  • Delta inverter

    Publication Year: 1980 , Page(s): 333 - 340
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (824 KB)  

    The delta inverter is a novel circuit which uses only three power transistors to produce a three-phase supply. Requiring approximately half the components of a conventional bridge inverter it therefore has potential cost and reliability advantages. The basic operating principles of the delta inverter are explained, using passive resistive and inductive loads. Some aspects of its performance are co... View full abstract»

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  • Design of 400 Hz saturistor motors with improved starting performance

    Publication Year: 1980 , Page(s): 341 - 348
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (799 KB)  

    A method is presented for predicting, from physical design data, the performance of saturistor induction motors having idle bars of permanent magnet material in the rotor slots. It is shown how the analysis may be used to synthesise the physical design of a motor in order to achieve a specified starting performance. The procedure is applied to the design of a 400 Hz aircraft motor to obtain reduce... View full abstract»

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  • Scheme to improve transient response of industrial systems

    Publication Year: 1980 , Page(s): 349 - 357
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1143 KB)  

    This paper is based on recent electrical system studies carried out on an Imperial Chemical Industries (ICI) plant located in Scotland, which derives its power supplies from both in-house generators and grid interconnection. The objective was to examine methods of improving the transient response of the industrial system under various external and internal fault conditions, with a view to improvin... View full abstract»

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  • Determination of network voltage distortion factor by digital computer simulation

    Publication Year: 1980 , Page(s): 358 - 362
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (551 KB)  

    A method for the computation of the voltage distortion factor by digital computer simulation of a network and a thyristor-regulated d.c.-motor drive has been developed. The influence of higher harmonics and network and motor-armature time constants on the network voltage distortion factor has been investigated. The results obtained from the voltage distortion factor computation are represented by ... View full abstract»

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  • Microcomputer-based power-semiconductor-circuit waveform analyser

    Publication Year: 1980 , Page(s): 363 - 367
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (544 KB)  

    The paper describes a signal-processing system developed for the analysis of power-semiconductor waveforms. The system combines the acqusition versatility of a digital tiansient recorder with the computational capabilities of the microcomputer. Waveforms may be displayed, stored or processed, and various processing options are described in the paper. Problems arising from point-by-point calculatio... View full abstract»

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  • Three-dimensional nonlinear electromagnetic field computations, using scalar potentials

    Publication Year: 1980 , Page(s): 368 - 374
    Cited by:  Papers (32)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (700 KB)  

    A formulation based on scalar potentials for the numerical solution of three-dimensional nonlinear static electromagnetic field problems is presented. The resulting equations are solved using imite elements, based on a Galerkin procedure. A general-purpose package called TOSCA has been developed, implemented and tested. Results are presented for three cases and compared with measured values. View full abstract»

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  • New method of low-speed commutation of an inverter-fed synchronous motor

    Publication Year: 1980 , Page(s): 375 - 381
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (650 KB)  

    The naturally commutated, inverter-fed synchronous machine cannot use rotational voltages for natural commutation at very low speeds, and the usual technique to overcome this is to pulse the d.c. input to the inverter. A new technique is described which makes use of transformer action between rotor and stator, the rotor being supplied from halfwave rectified a.c. Commutation is automatic and requi... View full abstract»

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  • Study of rapid speed-changing methods in ac. motor drives

    Publication Year: 1980 , Page(s): 382 - 385
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (406 KB)  

    Previous studies of speed changing in induction motor drives have been concerned either with varying the frequency of a sine-wave supply, or have considered steady-state or quasi-steady-state operation with inverters. The present contribution discusses various techniques for controlling the start-up performance of an induction motor system with sine-wave, 180° inverter and 120° inverter waveform... View full abstract»

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  • Discussion on Diagnostic testing of high-voltage machine insulation

    Publication Year: 1980 , Page(s): 386 - 388
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (445 KB)  

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