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IEE Proceedings B - Electric Power Applications

Issue 5 • Date September 1985

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Displaying Results 1 - 12 of 12
  • Editorial

    Publication Year: 1985
    IEEE is not the copyright holder of this material | PDF file iconPDF (43 KB)
    Freely Available from IEEE
  • Discharge detection techniques for stator windings

    Publication Year: 1985, Page(s):234 - 244
    Cited by:  Papers (32)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1467 KB)

    Partial-discharge measurements are being used increasingly to detect localised or damaged areas in modern high-voltage stator windings. However, ambiguities may arise because of the complex LC network between coils. Discharge pulses propagate in a variety of modes, each having different attenuation factors. Tests with diamond-wound motor stators and a 500 MW generator stator show that pulse detect... View full abstract»

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  • A gate-turn-off thyristor chopper for traction drives

    Publication Year: 1985, Page(s):245 - 250
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (980 KB)

    The paper describes a chopper circuit using three gate-turn-off thyristors in which the need for regrouping contactors, to change from motoring to braking or from braking to motoring has been eliminated. As the braking and motoring components are independent they can be rated for their specific duty cycles. Not only do gate-turn-off thyristors permit a higher chopping frequency than achieved with ... View full abstract»

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  • On the steady-state and dynamic characteristics of bipolar transistor power switches in low-loss technology

    Publication Year: 1985, Page(s):251 - 259
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1169 KB)

    To achieve loss reduction in large power switches based on bipolar transistor technology, the injection of a compensating voltage into the Darlington loop is investigated theoretically and experimentally for several configurations. The theoretical model predicts that a total loss reduction of 50% in the steady-state could be possible in comparison to conventional Darlington and directly-driven sin... View full abstract»

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  • A loss minimised sinusoidal PWM inverter

    Publication Year: 1985, Page(s):260 - 268
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1099 KB)

    Traditional PWM AC motor drives perform well over a wide speed range and have many positive features associated with their simplicity. However, the waveforms used are significantly less than ideal at high modulation depths and low switching rates, particularly with regard to harmonically induced motor losses. An improved strategy for digitally producing PWM based on conventional triangulation meth... View full abstract»

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  • Theoretical investigations into the use of conducting crucibles in medium-frequency metal melting

    Publication Year: 1985, Page(s):269 - 278
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1065 KB)

    Clay-graphite and carbon-bonded silicon-carbide crucibles are used in nonferrous induction melting furnaces. Silicon-carbide crucibles especially have encountered premature failure when used at high power densities and operating frequencies. This is thought to be related to their nonuniform properties. To gain a more thorough understanding of this problem, an equivalent circuit analysis has been a... View full abstract»

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  • Erratum: Multiconductor transmission-line model for the line-end coil of large AC machines

    Publication Year: 1985
    IEEE is not the copyright holder of this material | PDF file iconPDF (51 KB)
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  • Torque availability from small synchronous motors using high coercivity magnets

    Publication Year: 1985, Page(s):279 - 288
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1157 KB)

    The torque available from small synchronous machines having high-coercivity rotor magnets is calculated from purely electromagnetic considerations. A general number of stator slots is considered together with circular and trapezoidal slot profiles. A method of optimising the stator lamination is presented for both slot forms. Torque performance and lamination details are given as a function of the... View full abstract»

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  • Single- to 3-phase transient phase conversion in induction motor drives

    Publication Year: 1985, Page(s):289 - 296
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (880 KB)

    The paper analyses the requirements for transient phase balance when operating 3-phase induction motors from a single-phase supply. It is shown that exact phase balance can never be achieved with a single-capacitor phase convertor. The required parameters of a two-element phase convertor are determined as functions of motor slip. AC phase control and AC current chopping are used to maintain the co... View full abstract»

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  • IEE colloquium on improving industrial energy efficiency by electrical methods

    Publication Year: 1985, Page(s):297 - 298
    IEEE is not the copyright holder of this material | PDF file iconPDF (333 KB)
    Freely Available from IEEE
  • Convertor Engineering: an Introduction to Operation and Theory

    Publication Year: 1985
    IEEE is not the copyright holder of this material | PDF file iconPDF (171 KB)
    Freely Available from IEEE
  • Superconducting Rotating Electrical Machines

    Publication Year: 1985, Page(s):298 - 299
    IEEE is not the copyright holder of this material | PDF file iconPDF (301 KB)
    Freely Available from IEEE