Characteristics of lightning‐induced voltages based on experimental data

Santos, Michele N. N.; Piantini, Alexandre

doi:10.1049/hve2.12055

Cited by 10 publications

(8 citation statements)

References 29 publications

(53 reference statements)

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“…Most LIOV waveforms are bipolar [15] (i.e. they consist of both positive and negative half-cycles), but for this research the polarity of the first half-cycle of the LIOV oscillation was of interest.…”

Section: A Methods To Distinguish Between Nearby Lightning and Direct...mentioning

confidence: 99%

A New Method to Distinguish between Nearby and Direct Lightning Strikes for Long Operational Medium Voltage Lines

2022

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Lightning strikes near Medium Voltage (MV) electricity distribution lines cause voltage transients to be induced onto the conductors of the power lines. The resultant Lightning Induced Overvoltage (LIOV) on the phase conductors may be estimated using computer models or measurements. Models and measurements are mostly limited to short floating lines to simplify calculations and to ensure accurate results that can be easily compared between different models. Existing measurement methods cannot be used to distinguish between nearby lightning and direct lightning strikes to an operational MV network by using only one instrument on a line that is more than 100 km long. The instrument needs to be less than a hundred meters from where the LIOV amplitude on the line is the highest. The new method described in this paper allows one to distinguish between nearby and direct lightning strikes to the line; by comparing the polarity of the current transient recorded at the substation to the lightning return-stroke polarity obtained from a lightning detection network. The new method also allows one to determine whether the LIOV of a particular lightning transient exceeded the Basic Insulation Level (BIL) of the line, by observing the power frequency fault current. The new method was applied to an operational 714 km network operating at 22 kV, and the results were compared with predictions in IEEE Std 1410-2010. Significantly fewer line faults due to nearby lightning were observed than predicted; the reason for this is explained.

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Section: A Methods To Distinguish Between Nearby Lightning and Direct...mentioning

confidence: 99%

A New Method to Distinguish between Nearby and Direct Lightning Strikes for Long Operational Medium Voltage Lines

2022

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“…Figure 16b shows that the waveform of the measured lightning-induced voltage generally exhibits a bipolar oscillation phenomenon. According to the statistical criteria proposed by Piantini et al [38], the maximum voltage (−12.12 kV) occurs in the first semi-cycle, and the second semi-cycle is the one with the longest duration of about 0.2 ms. The characteristics of oscillating wavetails observed in the measured overvoltage are coherent with FDTD calculation by the proposed approach and also with measurement performed by Piantini et al [38].…”

Section: Comparison With the Measured Datamentioning

confidence: 99%

Evaluation of lightning‐induced overvoltage on a 10 kV distribution line based on electromagnetic return‐stroke model using finite‐difference time‐domain

Duan,

Zhang,

Huang

et al. 2024

High Voltage

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Accurate simulation of lightning‐induced overvoltage for overhead distribution lines is helpful to prevent lightning trip accidents. An electromagnetic return‐stroke model was used to represent lightning and then a 3D finite‐difference time‐domain (FDTD) method was adopted to simulate the lightning‐induced overvoltage on a distribution line without a field‐line coupling model. How lightning‐induced overvoltage behave for different ground conductivity and varying distance between the distribution line and the lightning channel was analysed. The results showed that the overvoltage waveforms at the centre point of the line corresponding to lightning strikes on the lossy ground and an ideal ground (σ = ∞) were similar; however, the peak amplitudes of the waveform were affected by soil conductivity at a close distance. The relationship between magnitude of the overvoltage and distance can be described by a second‐order exponential decay equation. Finally, the overvoltage calculated using the proposed model was compared with those obtained based on Agrawal's model and measurements made using the newly developed intelligent insulator on site. From these comparisons, it could be concluded that the FDTD method with the electromagnetic return‐stroke model produces reasonably accurate results of the attenuated oscillation waveform, which can better reproduce the overvoltage on operational distribution lines.

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“…Lightning hazards have become a serious concern in many domains, such as power systems, human activities, industrial production etc. [1,2] In recent years, particular attention has been paid to the lightning strike protection (LSP) of aircrafts with fibre-reinforced composites, such as carbon/glass fibrereinforced plastic (CFRP/GFRP) composites [3,4]. Although the application of those advanced materials balanced the weight and mechanical strength, the higher electrical and thermal resistivity make the aircraft shell more vulnerable when facing the lightning strike, causing a lot of negative effects (direct/indirect) [5].…”

Section: Introductionmentioning

confidence: 99%

Observation and verification of surface electrical explosion driven by radial‐distributed pulsed current in laboratory lightning strike test

Han,

Cao,

Liu

et al. 2023

High Voltage

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The laboratory lightning test is essential for assessing the effectiveness of lightning strike protection (LSP). Particularly, direct lightning strike damage can be performed with pulsed current injection into the specimen. This paper focuses on the dynamic process of arc plasma and shock wave behaviour in the vicinity of the ‘strike’ point. A rod‐plate discharge load is built for testing aluminium and coated plate under 40‐kA‐level pulsed current. The visualisation of the luminous discharge plasma and its flow field via high‐speed photography (from different angles) is meticulously designed and implemented, synchronised with electro‐physical diagnostics. The results indicate some new mechanisms for lightning strike damage, apart from the impulse heat loading from the thermal arc. The transient current injection through the arc root concentrates on a thin skin layer (skin‐depth effect), with the radial‐attenuated current density, driving asynchronously electrical explosions on the plate surface. The inhomogeneous Joule heating of the plate leads to outwardly propagating phase transition and shock wave along the conductive surface. In addition, the electro‐thermal instability is observed and regarded as the seed of irregular erosion region. Spectroscopic information reveals two different plasma states of main discharge arc channel and adjacent surface electrical explosion. The correspondence of the physical mechanism of electrical explosion and optical radiation is established. Microscopic images for different regions depict erosion characteristics and summarise influencing factors, further confirming the mechanism above. The research clarifies the role of skin‐depth effect in transaction arc erosion for electrode, complements the electrical explosion theory with unevenly distributed current and helps optimise strategies of LSP.

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Characteristics of lightning‐induced voltages based on experimental data

Cited by 10 publications

References 29 publications

A New Method to Distinguish between Nearby and Direct Lightning Strikes for Long Operational Medium Voltage Lines

A New Method to Distinguish between Nearby and Direct Lightning Strikes for Long Operational Medium Voltage Lines

Evaluation of lightning‐induced overvoltage on a 10 kV distribution line based on electromagnetic return‐stroke model using finite‐difference time‐domain

Observation and verification of surface electrical explosion driven by radial‐distributed pulsed current in laboratory lightning strike test

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