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IEE Proceedings B - Electric Power Applications

Issue 2 • Date March 1988

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Displaying Results 1 - 16 of 16
  • Inductive interference effects in the Hong Kong Island line signalling system

    Publication Year: 1988, Page(s):41 - 51
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1054 KB)

    The authors describe inductive interference effects, which exist when track based cables are used for track-to-train speed commands in a railway system, which also uses jointless track circuits for train detection. They show that spurious speed commands (ghost signals) can be transmitted to trains not intended to receive the original message, and that in some circumstances this could be dangerous.... View full abstract»

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  • Harmonic modelling of synchronous machines

    Publication Year: 1988, Page(s):52 - 58
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (566 KB)

    The connection of power converter and other nonlinear loads to the electrical power system results in other system components being subject to voltage waveform distortion. In order to predict the resultant heating and harmonic current flows, it is necessary to have fairly accurate models for components such as synchronous machinery. The authors present a theoretical and experimental study into the... View full abstract»

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  • Optimal PWM microprocessor-controlled current-source inverter drives

    Publication Year: 1988, Page(s):59 - 75
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2278 KB)

    Optimal PWM switching strategies are presented for the current-source inverter (CSI) induction motor drive. These optimal PWM strategies are designed with the objective of improving the quality of the rotational motion of the drive at low operating speeds, thereby extending the viable range of operation and application of CSI drives. Optimal PWM switching strategies designed to minimise rotor spee... View full abstract»

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  • Power components in a system with sinusoidal and nonsinusoidal voltages and/or currents

    Publication Year: 1988, Page(s):76 - 84
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (753 KB)

    Definitions of power components are reviewed, and their disadvantages are analysed. New definitions of active, reactive, distortion and apparent power are discussed. It is attempted to find a clear physical interpretation, and to formulate this for each power component in systems with sinusoidal and/or nonsinusoidal voltage and current. Formulas for the straightforward calculation of each power co... View full abstract»

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  • Current equalising transformer for current balance in parallel-connected 12-pulse converter

    Publication Year: 1988, Page(s):85 - 90
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (627 KB)

    Current out-of-balance in 12-pulse rectifiers between two 6-pulse groups has caused serious problems. This has become particularly pronounced with semiconductor rectifiers where 12-pulse operation is obtained by two phase-displaced 3-phase bridge rectifier circuits operating in parallel. A current equalising transformer (CET) was introduced to overcome the problem. A new simpler variation of this ... View full abstract»

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  • Determination of thyristor reverse recovery current parameters

    Publication Year: 1988, Page(s):91 - 96
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (397 KB)

    The authors describe a method of determination of reverse recovery current parameters of the thyristor turnoff model, namely, the peak reverse recovery current and its decay time constant. The parameters are determined from a set of recovered charge curves, and another set of reverse energy loss curves, usually given in the manufacturer's data sheet so that the curves may be fitted over a wide ran... View full abstract»

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  • Digital synchronisation of switching transistors

    Publication Year: 1988, Page(s):97 - 101
    Cited by:  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (530 KB)

    A digital technique is described for controlling the application and removal of base drive to parallel connected power transistors so that they switch on and off in synchronism, and with minimum power dissipation. The control circuitry was designed specifically for integration on an uncommitted logic array to produce a dedicated integrated circuit. This circuit, together with its power transistor,... View full abstract»

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  • Spectral response of nonlinear magnetic conductors

    Publication Year: 1988, Page(s):102 - 104
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    A general procedure for predicting the amplitudes of the magnetic induction components, resulting from multisinusoidal excitation of a nonlinear magnetic conductor, is presented. The magnetisation curve of the magnetic conductor is represented by a sine series. The amplitudes of the magnetic induction components are expressed in terms of the Bessel functions with arguments proportional to the ampl... View full abstract»

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  • Inductive interference effects in the Hong Kong Island Line signalling system

    Publication Year: 1988, Page(s):41 - 51
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1335 KB)

    This paper describes inductive interference effects, which exist when track based cables are used for track-to-train speed commands in a railway system, which also uses jointless track circuits for train detection. It is shown that spurious speed commands (ghost signals) can be transmitted to trains not intended to receive the original message, and that in some circumstances this could be dangerou... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Harmonic modelling of synchronous machines

    Publication Year: 1988, Page(s):52 - 58
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (701 KB)

    The connection of power converter and other nonlinear loads to the electrical power system results in other system components being subject to voltage waveform distortion. In order to predict the resultant heating and harmonic current flows, it is necessary to have fairly accurate models for components such as synchronous machinery. The paper presents a theoretical and experimental study into the ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimal PWM microprocessor-controlled current-source inverter drives

    Publication Year: 1988, Page(s):59 - 75
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2324 KB)

    Optimal PWM switching strategies are presented for the current-source inverter (CSI) induction motor drive. These optimal PWM strategies are designed with the objective of improving the quality of the rotational motion of the drive at low operating speeds, thereby extending the viable range of operation and application of CSI drives. Optimal PWM switching strategies designed to minimise rotor spee... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power components in a system with sinusoidal and nonsinusoidal voltages and/or currents

    Publication Year: 1988, Page(s):76 - 84
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (952 KB)

    Currently accepted definitions of power components are reviewed, and their disadvantages are analysed. New definitions of active, reactive, distortion, and apparent power are discussed. It is attempted to find a clear physical interpretation, and to formulate this for each power component in systems with sinusoidal and/or nonsinusoidal voltage and current. Formulas for the straightforward calculat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Current equalising transformer for current balance in parallel-connected 12-pulse converter

    Publication Year: 1988, Page(s):85 - 90
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (772 KB)

    There has been a serious problem of current out-of-balance in 12-pulse rectifiers between two 6-pulse groups. This has become particularly pronounced with semiconductor rectifiers where 12-pulse operation is obtained by two phase-displaced 3-phase bridge rectifier circuits operating in parallel. A current equalising transformer (CET) was introduced to overcome the problem. A new simpler variation ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Determination of thyristor reverse recovery current parameters

    Publication Year: 1988, Page(s):91 - 96
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (486 KB)

    This paper describes a method of determination of reverse recovery current parameters of the thyristor turnoff model, namely, the peak reverse recovery current and its decay time constant. The parameters are determined from a set of recovered charge curves, and another set of reverse energy loss curves, usually given in the manufacturer's data sheet so that the curves may be fitted over a wide ran... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital synchronisation of switching transistors

    Publication Year: 1988
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (672 KB)

    A digital technique is described for controlling the application and removal of base drive to parallel connected power transistors so that they switch on and off in synchronism, and with minimum power dissiptation. The control circuitry was designed specifically for integration on an uncommitted logic array to produce a dedicated integrated circuit. This circuit, together with its power transistor... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spectral response of nonlinear magnetic conductors

    Publication Year: 1988, Page(s):102 - 104
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (341 KB)

    A general procedure for predicting the amplitudes of the magnetic induction components, resulting from multisinusoidal excitation of a non linear magnetic conductor, is presented. The magnetisation curve of the magnetic conductor is represented by a sine series. The amplitudes of the magnetic induction components are expressed in terms of the Bessel functions with arguments pro portional to the am... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.