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IEE Proceedings C - Generation, Transmission and Distribution

Issue 3 • May 1993

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Displaying Results 1 - 11 of 11
  • Ferroresonance in power systems: chaotic behaviour

    Publication Year: 1993, Page(s):237 - 240
    Cited by:  Papers (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (265 KB)

    The solution of the nonlinear equation for a typical ferroresonant circuit in a power system is shown to exhibit three types of ferroresonant states: periodic, quasiperiodic and chaotic. Simulations of each of these states are presented for different sets of parameters of the system. It is also shown that the transformer losses are an important factor in obtaining the chaotic state.<> View full abstract»

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  • Prediction of hysteresis losses produced by distorted flux in low-loss silicon-iron transformer core laminations

    Publication Year: 1993, Page(s):229 - 236
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (505 KB)

    A digital method for predicting the hysteresis losses in low-loss silicon-iron laminations, as used in transformer cores, with distorted supply voltages, is presented. The method uses a model based on a piecewise linearisation technique to simulate steady-state B/H characteristics for such materials. Major and minor loop areas computed from simulated B/H characteristics are used to estimate the hy... View full abstract»

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  • Voltage stability as affected by static load characteristics

    Publication Year: 1993, Page(s):221 - 228
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (705 KB)

    Voltage stability is analysed as a dynamic phenomenon associated with the excitation field dynamics of synchronous machines. It is shown that, for constant impedance loads, a single machine powersystem is voltage stable for all reasonable operating conditions. For constant power loads, however, a simple system has a voltage controllability limit that can be close to nominal voltage. The voltage st... View full abstract»

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  • Practical method for the analysis of earthing systems with long external electrodes

    Publication Year: 1993, Page(s):213 - 220
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (688 KB)

    The earthing problem of distribution substations that supply consumers through a radial underground network, with cables having uninsulated outer sheaths, is solved efficiently and in a satisfactory manner, even when all the other relevant factors are very unfavourable. In a wide area surrounding these substations, the cable lines spontaneously form a large network of earthing conductors, which in... View full abstract»

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  • Three phase harmonic modelling of power system loads

    Publication Year: 1993, Page(s):206 - 212
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (536 KB)

    This paper reports the development and testing of a method for modelling distribution load impedances as unbalanced three phase impedance matrices for detailed harmonic studies. The experimental testing of this method was performed using data obtained from capacitor switching and transformer tap changing disturbances. This method is applicable even in situations where harmonic sources within the l... View full abstract»

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  • Novel decoupled load flow method

    Publication Year: 1993, Page(s):199 - 205
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (593 KB)

    Most of the reported decoupled load flow methods are derived from the Newton method by neglecting the coupling subjacobians. The paper presents a novel decoupled load flow method that does not ignore the coupling subjacobians. The effects of the coupling subjacobians are carefully taken into account by properly modifying the mismatch vectors and coefficient matrices of the proposed decoupled load ... View full abstract»

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  • Decision tree approaches to voltage security assessment

    Publication Year: 1993, Page(s):189 - 198
    Cited by:  Papers (22)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (935 KB)

    A decision tree methodology is proposed to tackle voltage security concerns under two distinct facets, namely preventive-wise and emergency-wise. Decision tree methodology in general consists of inferring information from a 'learning set of states', and of compressing while hierarchically organising this information in a tree fashion, in terms of salient parameters automatically selected by the me... View full abstract»

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  • Decomposed three-phase power flow solution using the sequence component frame

    Publication Year: 1993, Page(s):181 - 188
    Cited by:  Papers (28)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (557 KB)

    With new developments in power systems, system unbalance is somewhat aggravated. Three-phase analysis of power systems is necessary both for planning and for monitoring. In the paper, a decomposed three-phase AC power flow algorithm using the sequence component frame is developed, in which a three-phase unbalanced power flow problem is decomposed into three separate subproblems with weak mutuality... View full abstract»

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  • Pricing reactive power conveyance

    Publication Year: 1993, Page(s):174 - 180
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (589 KB)

    The transmission of electrical power and reactive power from a seller to a buyer through a transmission network obviously has cost implications. The costs incurred are of interest to transmission system owners in view of the increased interest in deregulation in recent years. The paper provides a theory of an ideal conveyance rate based on marginal cost pricing theory. An analysis is made of the m... View full abstract»

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  • Measurements on stationary metal contacts under high charge injection rates

    Publication Year: 1993, Page(s):167 - 173
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (544 KB)

    In the real world even the simplest of electrical circuits may exhibit unpredictable behaviour and it seems that the theory of chaos touches all disciplines. In this work, the operation of switch contacts is investigated under high charge injection conditions. It is experimentally shown that the I-V curves traced across industrial switches may exhibit bifurcation and nonlinear characteristics with... View full abstract»

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  • Prediction of harmonic voltage distortion when a nonlinear load is connected to an already distorted supply

    Publication Year: 1993, Page(s):161 - 166
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (470 KB)

    Before an industrial consumer is allowed to connect a nonlinear load to a power network, he is often required to perform a calculation to predict the harmonic voltage distortion that will result at the point of connection to other consumers. When carrying out this calculation it is often assumed that the supply voltage waveform is a pure sinusoid before the load is connected. In fact the supply wa... View full abstract»

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