Zeqing Song

University of Manitoba, Winnipeg, Manitoba, Canada

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Publications (4)0 Total impact

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    ABSTRACT: Assessment of over-voltage in underground power distribution cables, due to lightning strikes impacting the earth's surface and terminating on the cable, is important in the design of suitable protection schemes and mitigating strategies. Existing models do not account adequately the effect of the characteristics of soil breakdown channels intercepted by the cable. In this paper, over-voltage in underground cable is investigated by considering the effect of the characteristics of soil breakdown paths predicted using a suggested model on an electric-field-related probabilistic basis. The model provides probabilistic information on the over-voltage in struck cables for different soil characteristics and geometrical configurations.
    Electrical and Computer Engineering, 2003. IEEE CCECE 2003. Canadian Conference on; 06/2003
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    ABSTRACT: Electric utilities are concerned about the possibility of damage to underground power distribution cables due to lightning strikes impacting the earth's surface and terminating on the cable. Assessment of such occurrences is important in the design of suitable protection schemes and mitigating strategies. Existing models focus on only one of aspect of the problem and therefore do not provide a complete assessment. In this paper, a complete model is suggested by linking elements of existing models. The model provides information on current in and overvoltage on struck cables with soil characteristics and geometrical configuration as parameters.
    Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on; 02/2002
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    ABSTRACT: Information about the initial electric field distribution in soil is fundamental to the prediction of lightning-caused breakdown paths and performance of struck underground cables. Field calculations in existing models assume homogeneous soils and ignore presence of cables. In this paper, the initial electric field distribution is calculated using a 2-dimensional model which recognizes the presence of cables and soil inhomogeneity. The effects of artificial boundary placement, lightning strike location and cable configuration have also been considered. The results are used to explain the effect of the presence of the cable on the tendency of formation of breakdown paths in soil. The proposed model is useful in assessing the impact of direct lightning strikes on underground cables.
    Electrical Insulation and Dielectric Phenomena, 2002 Annual Report Conference on; 02/2002
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    ABSTRACT: The reported methods dealing with calculation of transient impedance of an earth electrode assume that the lightning current diffuses into the conducting soil. From the results of recent indoor and outdoor experiments it is shown that the above mechanism is not always operative and that the nature of current propagation in the soil is related to soil characteristics and parameters of the impulse current generator. The response of the soil has been investigated with different types of soils with different resistivities. The differing mechanisms of current propagation in dry and wet soil are indicated; it is shown that a lower impedance results in the former case
    Electrical Insulation and Dielectric Phenomena, 2000 Annual Report Conference on; 02/2000

Publication Stats

5 Citations

Institutions

  • 2000–2003
    • University of Manitoba
      • Department of Electrical and Computer Engineering
      Winnipeg, Manitoba, Canada