Study of Step and Touch Voltages in Resistive/Capacitive Ground due to Lightning Stroke

Nayel, Mohamed; Zhao, Jie; He, Jinliang; Cai, Zongyuan; Wang, Qi

doi:10.1109/ceem.2006.257906

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…In spite of that, the transient GPR at the point where a person standing has different value for every location in the grounding grid. From the definition of touch voltage, the higher potential difference between the energized conductor and the transient GPR, the higher touch voltage is produced [17][18]. So, in this case, the potential difference is higher at the feed point A than the feed point B and C.…”

Section: Effect Of Feed Point With Different Soil Profilesmentioning

confidence: 96%

Effects of Soil Profile on the Transient Performance of Substation Grounding System

Malek

Yaman

Adnan

2020

IJEECS

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<table width="593" border="1" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" width="387"><p>Lightning transient characteristic of the grounding grid is fundamental for optimum performance of lightning protection of a substation. In order to design an appropriate grounding system for such substation, it is important to study its transient characteristics because the high impulse current is significantly different compared to power frequency current. In this paper, substation grounding grid model was developed using CDEGS software to analyze the grid transient performance in terms of ground potential rise (GPR), touch voltage and step voltage when the grounding system is struck by a lightning impulse current. Several parameters, such as lightning current amplitude, feed point and the number of sub-grids, were altered to study their relationship with the transient performance. The maximum transient GPR, touch voltage, and step voltage increase as the lightning current amplitude increase. The maximum transient GPR and step voltage are the highest at the corner of the grounding grid while the maximum touch voltage is the highest at the centre of the grounding grid. In addition, the maximum transient GPR and step voltage decrease when the number of sub-grid increases. In contrast, the touch voltage slightly increases as the number of sub-grid increases. The maximum transient GPR, and step voltage are the highest at the 2-layer and the lowest at the uniform soil or single-layer soil.</p></td></tr></tbody></table>

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Section: Effect Of Feed Point With Different Soil Profilesmentioning

confidence: 96%

Effects of Soil Profile on the Transient Performance of Substation Grounding System

Malek

Yaman

Adnan

2020

IJEECS

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“…Extensive research evaluated the impact of ground electrodes length on the performance of grounding systems [18], [24], [85], [91], [97]. This section presents the effects of different…”

Section: E Effect Of Length Of Electrodementioning

confidence: 99%

Review of Substation Grounding System Behavior Under High Frequency and Transient Faults in Uniform Soil

et al. 2020

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Substations are important parts of electric power systems, and they require well-designed grounding systems. A proper grounding system guarantees the safety of the personnel working in an environment surrounded by grounded equipment from possible electric shock, protects the equipment against unnecessary breakdowns, and conserves the stability of the entire electrical system throughout its operation. Grounding systems developed under power frequency conditions generally react differently under high frequency and transient conditions, such as switching transients and lightning strikes. This work reviews the modeling methods for substation grounding systems and their performance when grounding design parameters change under high frequency and transient fault conditions.

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“…Few experimental studies on step and touch voltages at towers and resistive grounds have been reported [14,15]. In this work, the physical layout arrangements used for the measurement of touch and step voltages around one of the tower footings (Footing No.4) is shown in Fig.…”

Section: Prospective Touch and Step Voltage Measurementsmentioning

confidence: 99%

Experimental Investigation of Impulse Characteristics of Transmission Line Tower Footings

Harid¹

2012

JLR

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Abstract:Understanding the impulse response of tower grounding systems is a key factor in the determination of the lightning performance of transmission lines and the safety voltages near high voltage towers. This paper reports the results of an experimental study on the impulse characteristics of full-scale transmission line tower footings. The ground potential distribution both at the ground surface and below ground was examined under impulse currents and variable-frequency AC currents. Prospective impulse step and touch voltages were determined by measurement of the ground surface potential distribution near the tower base. The behaviour of the impulse resistance of the tower footings under highmagnitude impulse currents was investigated. The non-linear characteristics of the impulse resistance with peak current are demonstrated for the entire tower base and for single tower footings. The soil ionisation inception is found to be dependent on the rate of rise of applied current. The dynamic impulse resistance was used to describe the dynamics of soil ionisation.

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Study of Step and Touch Voltages in Resistive/Capacitive Ground due to Lightning Stroke

Cited by 7 publications

References 10 publications

Effects of Soil Profile on the Transient Performance of Substation Grounding System

Effects of Soil Profile on the Transient Performance of Substation Grounding System

Review of Substation Grounding System Behavior Under High Frequency and Transient Faults in Uniform Soil

Experimental Investigation of Impulse Characteristics of Transmission Line Tower Footings

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