A first approach in the modelling of failures in rotor blades caused by lightning strikes

Hernández, Y Méndez; Castro, Aida; Kindersberger, J.; Lewke, B.; DiBella, Joseph; Hardison, R. Logan; Stolper, Roel

doi:10.1109/iclp.2010.7845942

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…From the perspective of thermal and mechanical damage caused by lightning, two basic types of lightning stroke (among many other classifications) have been proposed from the scientific community and are worth to be considered: • Long duration strokes or continuing currents (CCs) are characterized by an almost direct curr ent (DC) of comparatively low amplitude (a few lOO A) and long duration (up to 500 ms); they dominate the melting and erosion at arc roots attaching to metal surfaces. The comparatively long duration of lightning continuing currents of up to half a second enables a deep penetration of the melt front into the material and may cause carbonization and bums marks on the composite material [3] [4] .…”

Section: A Lightning Parametersmentioning

confidence: 99%

An experimental approach of the effects of lightning currents on rotor blade tips of wind turbines

Hernández¹,

Zischank

Stimper

et al. 2012

2012 International Conference on Lightning Protection (ICLP)

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Recent editions of standards for lightning protection of wind turbines recommend that air termination systems of rotor blades shall withstand severe requirements in terms of lightning current. An exception to this recommendation can be suggested, if a risk analysis shows that a lower lightning protection level -LPL can be achieved in the geographical location, where the wind park will be erected. In order to comply with the latest edition of these standards and the highest LPL, an experimental assessment in the high-current lab at the university was conducted; different configurations of air terminations systemswhere tested, which aim to reproduce "short duration strokes" and "long duration strokes". The classification of "passed" or "not-passed" was chosen for this validation.

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Section: A Lightning Parametersmentioning

confidence: 99%

An experimental approach of the effects of lightning currents on rotor blade tips of wind turbines

Hernández¹,

Zischank

Stimper

et al. 2012

2012 International Conference on Lightning Protection (ICLP)

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“…Bagherian et al, 23 using a blade model, analyzed the electric field intensity distribution with different receptor locations, sizes, and numbers. Hernández et al, 24 basing on the simulation results, proposed an approach to estimate the breakdown path. Wang and Hu 25 investigated the interception effect of different types of receptors, assuming the lightning attachment point as the location with the maximum electric field intensity.…”

Section: Introductionmentioning

confidence: 99%

“…Hernández et al, 24 basing on the simulation results, proposed an approach to estimate the breakdown path. Wang and Hu 25 investigated the interception effect of different types of receptors, assuming the lightning attachment point as the location with the maximum electric field intensity.…”

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confidence: 99%

Lightning attachment characteristic of wind turbine generator: Experimental investigation and prediction method based on simulations

et al. 2022

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As the height of wind turbine increases, the lightning strike accident has become a non‐negligible issue. In this paper, the lightning attachment characteristic of a 2‐MW wind turbine generator (WTG) is investigated using a model with a reduced scale of 100. The WTG model is equipped with receptors on the blades and a lightning rod on the nacelle, both serving as its external lightning protection system (LPS). The high‐voltage electrode, which delivers a lightning impulse voltage from a Marx generator, is used to simulate the final stage of downward negative lightning strikes from 29 coming‐leader positions. The experimental results indicate that lightning leaders from either front directions or side directions could be intercepted effectively by LPS, whereas the back‐direction lightning could not. Moreover, with the increase of striking distance, the capture ratio for the insulation part of blade decreases. Electric field intensity distribution simulations for the full‐scale WTG model, using conditions similar to their experimental counterparts, are conducted and compared with the lightning attachment distribution. Based on classical electro‐geometrical model, a simulative method is proposed to predict the lightning attachment distribution of WTG. Our results indicate that it is feasible with this method to produce a satisfactory approximation to the experimentally obtained lightning attachment distribution.

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A simulation approach in electrostatic charging of rotor blades and its effects on transferred overvoltages in wind parks

Hernández¹,

Tsovilis²,

Asimakopoulou³

et al. 2014

2014 International Conference on Lightning Protection (ICLP)

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the aim of this paper is to present a theoretical approach of the hypothesis of electrostatic charging of rotor blades during storms and its effects on the lightning protection and overvoltage protection systems; taking into consideration the dimensions of multi-megawatt wind turbines and a particular electrical topology. Overvoltage and overcurrent in form of surges may be the result of electromagnetic traveling waves caused by lightning strikes, especially if the earthing (grounding) system of the wind turbines (WTs) is galvanic connected between each other in order to ensure a common earth potential in the wind park (WP). These effects may impose additional requirements for the reliable operation of the low voltage and medium voltage protection against surges.In Fig. 1 an example of extended electric discharges on a rotor blade root is depicted.

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A first approach in the modelling of failures in rotor blades caused by lightning strikes

Cited by 3 publications

References 1 publication

An experimental approach of the effects of lightning currents on rotor blade tips of wind turbines

An experimental approach of the effects of lightning currents on rotor blade tips of wind turbines

Lightning attachment characteristic of wind turbine generator: Experimental investigation and prediction method based on simulations

A simulation approach in electrostatic charging of rotor blades and its effects on transferred overvoltages in wind parks

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