Transient performance of substation grounding systems subjected to lightning and similar surge currents

Xiong, Wei; Dawalibi, F.P.

doi:10.1109/61.311170

Cited by 63 publications

(28 citation statements)

References 6 publications

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“…In addition to comparison with the cdegs software in five‐layer medium, the computed results show a particularly good agreement when compared with the appropriate figures published in where homogeneous soil is used, both in terms of shape of the distribution and obtained numerical field values. The obtained symmetry of the electric field distribution is particularly notable, which has not been the case for the results presented in .…”

Section: Numerical Examplesupporting

confidence: 53%

Computing the electromagnetic field of the system of arbitrarily positioned conductors in horizontally stratified multilayer medium

Sarajčev

Vujević

Lovrić

2014

Int J Numerical Modelling

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SUMMARYThis paper presents a novel computational methodology, based on the finite element technique, for the analysis of electromagnetic field due to system of arbitrarily positioned current-carrying conductors in horizontally stratified multilayer medium, having arbitrary number of layers with different characteristics (including air). Each soil layer is horizontally unbounded, homogenous and isotropic, whereas conductors can penetrate different layers and extend into the air. The effect of the stratified multilayer medium is taken into account by using the originally developed fixed image method. Complete electromagnetic coupling between grounding system conductors (satisfying thin-wire approximation) is taken into account, whereas attenuation and phase shift effects are approximated. The electric and magnetic field in stratified multilayer medium are computed from the scalar electric and vector magnetic potentials, using the said fixed image method and approximations to the attenuation and phase shift effects.

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Section: Numerical Examplesupporting

confidence: 53%

Computing the electromagnetic field of the system of arbitrarily positioned conductors in horizontally stratified multilayer medium

Sarajčev

Vujević

Lovrić

2014

Int J Numerical Modelling

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“…When the electrode is buried in a depth of , the capacitance is obtained by assuming two conductors with a distance of in an infinite medium, which is based on image theory. So the capacitance of a buried grounding conductor is equal to (8) The shunt conductance in Fig. 3 can be determined by [11] (9) Fig.…”

Section: B Analysis Model Of Extending Grounding Electrodementioning

confidence: 99%

Effective Length of Counterpoise Wire Under Lightning Current

Gao

Zeng

et al. 2005

IEEE Trans. Power Delivery

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In a high soil resistivity area, counterpoise wires are applied to decrease the grounding resistance of tower grounding devices. If the conductor of counterpoise wire is very long, although the power frequency grounding resistance of the tower grounding device is decreased, the lightning protection performance of the transmission line is still not good. The influences of the length of grounding electrodes on the lightning transient characteristic were analyzed. The dynamic and nonlinear effect of soil ionization around the grounding electrode was considered in the analysis model of transient characteristics for the grounding electrodes under lightning impulse. The counterpoise wire has an effective length when lightning passes through it. When the length of a grounding electrode exceeds the effective length, the grounding conductor will not be utilized effectively. The simulating experiments were performed to analyze influences of the length of the counterpoise wire on the impulse characteristics. The formulae to calculate the impulse effective lengths of counterpoise wires were proposed. The model proposed in the paper has been validated by comparing the numerical results with experimental tests.

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“…The impulse grounding impedance cannot be described as an absolute index, because it depends on the waveform of the impulse current, soil structure type and grounding system configuration, etc [4][5][6] . Field measurement of grounding impulse impedance is an effective method to investigate the performance of grounding system when it dissipating lightning current.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Impulse Grounding Impedance in Frequency Domain

Yang¹,

Li²,

2010

2010 International Conference on Intelligent System Design and Engineering Application

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Impulse grounding impedance cannot be described as an absolute index, because it depends on the characteristic of the impulse current waveform, soil structure type and grounding system configuration, etc. This paper presents a test system to measure the impulse grounding impedance directly in time domain, moreover, calculated and defined in frequency domain. A field test for 110kV tower footing has been performed to measure the impulse ground impedance, and compared it with the ground impedance measured by fall-of-potential method.

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Transient performance of substation grounding systems subjected to lightning and similar surge currents

Cited by 63 publications

References 6 publications

Computing the electromagnetic field of the system of arbitrarily positioned conductors in horizontally stratified multilayer medium

Computing the electromagnetic field of the system of arbitrarily positioned conductors in horizontally stratified multilayer medium

Effective Length of Counterpoise Wire Under Lightning Current

Measurement of Impulse Grounding Impedance in Frequency Domain

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