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IEE Proceedings B - Electric Power Applications

Issue 3 • Date May 1991

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Displaying Results 1 - 6 of 6
  • Computer simulation of three-phase prestriking transients in cable-connected motor systems

    Publication Year: 1991, Page(s):105 - 114
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1003 KB)

    Steep-fronted voltage transients, generated by prestriking conditions in circuit breakers and contactors when closing, produce severe interturn insulation stresses in machine windings. A computer program simulating the production of prestriking transients is described. The simulation is based on a full three-phase system representation, including busbars, switching device, cable and motor winding.... View full abstract»

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  • Characteristics of a squirrel cage induction motor

    Publication Year: 1991, Page(s):115 - 124
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (854 KB)

    The authors investigate the magnetic field distribution in a 1 hp three-phase induction motor. Utilising a triangular finite-element method, the magnetic field in the motor is analysed at various balanced magnetomotive forces, and four different rotor positions. From the field solutions, the flux linkages and the slot leakages are found for a range of magnetising currents. An experiment using a st... View full abstract»

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  • Design and implementation of a single phase current-forced switching mode bilateral convertor

    Publication Year: 1991, Page(s):129 - 136
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (623 KB)

    A single-phase switching mode bilateral convertor using current-forced hysteresis switching control is designed and successfully implemented. Based on the proposed current-forced switching scheme, the bidirectional power flow is very easy to control and the switching voltage jumps and losses can be reduced. Moreover, the line current can be sinusoidally regulated with unity power factor in the rec... View full abstract»

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  • V curve of hysteresis motor

    Publication Year: 1991, Page(s):137 - 141
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    The relation between the stator current and the field current of a synchronous motor at a constant terminal voltage and with a constant shaft load is known to be a V curve. It is shown, by both experiment and calculations, that the stator current of a hysteresis motor also shows a V curve. The mechanism of the V curve of the hysteresis motor is discussed. The relation between the hysteresis motor ... View full abstract»

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  • Three-phase flyback AC-DC convertor with sinusoidal supply currents

    Publication Year: 1991, Page(s):143 - 151
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (674 KB)

    A three-phase flyback AC-DC convertor which has the step-up and step-down characteristics of output voltage, is described. The introduction of pulsewidth modulation makes it possible to obtain the sinusoidal supply currents with a near unity power factor. Three gate-turn-off thyristors provide the necessary control over the currents for unidirectional power flow. To improve upon the oscillatory tr... View full abstract»

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  • Decomposition of Czarnecki's reactive current and reactive power

    Publication Year: 1991, Page(s):125 - 128
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    From the viewpoint of reactive power compensation, the decomposition of Czarnecki's reactive current component is discussed. When the number of harmonics present in the source voltage/current is higher than the number of reactive elements of the compensator, the reactive power can only be partially compensated. Thus the reactive current can be visualised as the sum of two components: the compensat... View full abstract»

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