Transient performance of substation structures and associated grounding systems

Dawalibi, F.P.; Xiong, Wei; Ma, Jianjun

doi:10.1109/28.382112

Cited by 47 publications

(40 citation statements)

References 14 publications

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“…It is also noted from Figures 4a-4d and for all other voltage and current signals that the current traces for all configurations are found to lag the voltage. Similar lagging current trace can also be found in literature [2][3][4][5][6][7] which could be due to inductive effects and ionisation of the earthing systems, which can be prominent under high frequency and high impulse conditions. When taking the earth resistance values under high impulse conditions, the inductive effect is being eliminated in the measurements.…”

Section: A Low Magnitude Currents and At Low Frequency Earth Resistisupporting

confidence: 77%

“…Since the complete ionisation or breakdown is not yet reached in the soil in these tests, the inductive effects would be expected to be present in parallel with the non-linear earth resistances of earthing systems as suggested in previous publications [5,[42][43]. However, it would be expected that at much higher voltages, where the breakdown in soil is expected to occur, the earthing systems are represented as a very low-resistance, as highlighted in many studies before [1][2][3][4][5][6][7]. These equivalent circuits can be seen in Refs.…”

Section: B High Impulse Currents Testsmentioning

confidence: 73%

“…However, many studies have shown that the performance of earthing system under impulse conditions is found to be different that that at low voltage and low frequency currents. In many publications, the difference in the earthing systems characteristics when subjected to high impulse currents is referred to the reduction of earth resistance values from its steady-state which are found to be dependent on a number of factors such as: R DC , impulse current magnitudes, impulse current rise times, earth electrode dimensions and soil resistivity [1][2][3][4][5][6][7]. These factors are mostly investigated by three approaches; field, laboratory and computer simulations [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance of Earthing Systems for Different Earth Electrode Configurations

Yunus

Nor

Etobi

et al. 2015

IEEE Trans. on Ind. Applicat.

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Section: A Low Magnitude Currents and At Low Frequency Earth Resistisupporting

confidence: 77%

Section: B High Impulse Currents Testsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance of Earthing Systems for Different Earth Electrode Configurations

Yunus

Nor

Etobi

et al. 2015

IEEE Trans. on Ind. Applicat.

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“…A previous work [47] presented an analysis of lighting current distribution in transmission overhead electrical line towers and ground wires, investigating in particular the effects of stroke-current waveshape on the crest-current magnitudes distribution. In Reference [48] the authors describe the frequency and time domain performance of an electrical substation ground electrode injected by a lightning stroke. Advanced computational models were implemented to simulate the response of grounding electrodes subject to lightning currents.…”

Section: Introductionmentioning

confidence: 99%

On the Distribution of Lightning Current among Interconnected Grounding Systems in Medium Voltage Grids

et al. 2018

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This paper presents the results of a first investigation on the effects of lightning stroke on medium voltage installations' grounding systems, interconnected with the metal shields of the Medium Voltage (MV) distribution grid cables or with bare buried copper ropes. The study enables us to evaluate the distribution of the lightning current among interconnected ground electrodes in order to estimate if the interconnection, usually created to reduce ground potential rise during a single-line-to-ground fault, can give place to dangerous situations far from the installation hit by the lightning stroke. Four different case studies of direct lightning stroke are presented and discussed: (1) two secondary substations interconnected by the cables' shields; (2) two secondary substations interconnected by a bare buried conductor; (3) a high voltage/medium voltage station connected with a secondary substation by the medium voltage cables' shields; (4) a high voltage/medium voltage station connected with a secondary substation by a bare buried conductor. The results of the simulations show that a higher peak-lowering action on the lighting-stroke current occurs due to the use of bare conductors as interconnection elements in comparison to the cables' shields.

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“…Advanced numerical models enable to investigate transient performances of extended earth electrodes [3][4][5] and the whole LPS [6].…”

Section: Introductionmentioning

confidence: 99%

Soil Ionization Due to High Pulse Transient Currents Leaked by Earth Electrodes

Ala¹,

Silvestre²,

Viola³

et al. 2009

PIER B

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Abstract-This paper proposes a numerical model of the soil ionization phenomena that can occur when earth electrodes are injected by high pulse transient currents, as the one associated with a direct lightning stroke. Based on finite difference time domain numerical scheme, this model ascribes the electrical breakdown in the soil to the process of discharge in the air. In fact, as soon as the local electric field overcomes the electrical strength, the air in the voids trapped among soil particles is ionized, and the current is conducted by ionized plasma paths locally grown. The dimension of these ionized air channels is strictly dependent upon the local temperature. Thus, a local heat balance is enforced in order to obtain the time variable conductivity profile of the medium. This model can be implemented both for concentrated and extended electrodes, since no hypothesis has to be enforced about the geometric shape of the ionized region. Validation of the proposed model is obtained by comparing simulation results with experimental data found in technical literature.

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Transient performance of substation structures and associated grounding systems

Cited by 47 publications

References 14 publications

Performance of Earthing Systems for Different Earth Electrode Configurations

Performance of Earthing Systems for Different Earth Electrode Configurations

On the Distribution of Lightning Current among Interconnected Grounding Systems in Medium Voltage Grids

Soil Ionization Due to High Pulse Transient Currents Leaked by Earth Electrodes

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