Lightning incidence on wind turbines in winter

Ishii, Masaru; Saito, Mikihisa; Natsuno, Daisuke; Sugita, Akiko

doi:10.1109/iclp.2014.6973409

Cited by 15 publications

(12 citation statements)

References 4 publications

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“…This is because positive ICC was flowing before the onset of pulse #1. A lot of bipolar upward flashes with large charge transfer have been observed in the coastal area of the Sea of Japan, as were reported in [5], [6] and [7]. There is a possibility in the future that such upward flashes will be also observed at Tokyo Skytree in winter season.…”

Section: Observed Lightning Currentsmentioning

confidence: 70%

Upward and downward lightning observed at Tokyo Skytree

Miki

Saito

Shindo

et al. 2014

2014 International Conference on Lightning Protection (ICLP)

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This paper describes observations of lightning current waveform at Tokyo Skytree, which stands in the eastern area of central Tokyo, located in the Kanto Plain, and is a 634-m high freestanding broadcasting tower. Direct observation of lightning current by using a pair of Rogowski coils started in the end of February 2012. From 2012 to the end of 2013, currents associated with 24 lightning flashes which hit the tower were recorded. In 2012, most of the flashes were upward as was expected; however, in 2013, most of the flashes observed in summer were downward. We have also evaluated statistical characteristics of obtained lightning current waveforms.

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Section: Observed Lightning Currentsmentioning

confidence: 70%

Upward and downward lightning observed at Tokyo Skytree

Miki

Saito

Shindo

et al. 2014

2014 International Conference on Lightning Protection (ICLP)

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“…Therefore, during the attachment process, the wind turbine is assumed to be static. Field observation shows that the numbers of lightning strikes to the wind turbine blade in the orientation of 90°, 60° and 30° are about the same [15]. However, the behavior of the receptor changes under different blade orientations.…”

Section: Introductionmentioning

confidence: 98%

Experimental Study on Lightning Attachment Manner to Wind Turbine Blades With Lightning Protection System

Zhang

et al. 2019

IEEE Trans. Plasma Sci.

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Different types of lightning protection systems (LPS) have been developed for wind turbines to protect the blades from lightning strikes. However, severe damages caused by lightning strikes still happen frequently, which creates huge costs. Experiments using a 5m blade specimen with tip receptors from 1.5 MW wind turbine blades under 3 m air gap were conducted to investigate the lightning attachment manner to the wind turbine blade with LPS in different situations. Factors including polarity of the lightning strikes, orientation of the blade and the lateral distances between the wind turbine blade and the lightning downward leader were taken into account. It was found that the types of the discharge path under positive and negative lightning strikes are quite different, and the positive discharges are much more dangerous to wind turbine blade than the negative ones. The lateral distance between the downward leader and the wind turbine blade is a key factor that influences the interception efficiency. Three types of receptor interception failure were discovered. Multiple upward leaders may incept from the blade body as to intercept the downward leader. However, the protection range of the tip receptor is quite limited, and the connection of the tip receptor and the blade body is the most vulnerable position hit by the lightning strikes. The results present useful reference to optimal design of the wind turbine blade LPS.

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“…Moreover, due to the increase of tip height of wind turbine, the effect of lightning strikes on wind turbines in space is obviously enhanced, resulting in a further increase in the accident rate of lightning damage for large capacity units. The operating data of Europe, America, Japan, and China show that most of the lightning strike points of wind turbines are positioned on the blades of the wind turbines [2][3][4][5]. Literature [2] statistics of the lightning damage of blades in a wind farm in Kansas, USA in 2012 and 2013.…”

Section: Introductionmentioning

confidence: 99%

“…Literature [2] statistics of the lightning damage of blades in a wind farm in Kansas, USA in 2012 and 2013. Literature [3] has pointed out that the frequency of wind turbine blade lightning faults in winter is higher than that in summer in Japan's coastal areas. Wang et al [4] analyzed the electric field changes of 14 leads on a wind turbine and its lightning tower.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of the Effect of a New Lightning Protection System on Lightning Protection and Aerodynamic Noise Performance of Wind Turbine Blades

Guo

Chen

et al. 2019

Electronics

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In order to tackle the problem of the high failure rate of blades of large wind turbine units due to lightning damage, a new lightning protection system (NLPS) for wind turbine blades is proposed based on the lightning damage mechanism of blades. Firstly, 10 high-voltage discharge tests are performed for blades with and without the NLPS to study the effect of lightning protection. The results show that when the surface of the blade without the NLPS is struck by lightning 10 times, the damage rate of the blade is 100%; for the blade with the NLPS and the lightning attachment position is always on the NLPS in 10 discharge tests, the damage rate of blades is 0% and the lightning protection rate of blades is 100%, indicating that the lightning protection effect for blades with the NLPS is greatly improved. Moreover, the static electric fields of the blades with and without the NLPS are calculated. The results show that the NLPS can shield the electric field around the lower lead wire of the blade, thus effectively reducing the electric field intensity. The NLPS initiates the upward leader more easily than the lower lead wire; therefore, the lightning attachment point is located on the NLPS, thus protecting the blade. Secondly, the aerodynamic and aero-noise characteristics of the blade with and without the NLPS are calculated. The results indicate that the NLPS has little influence on the aerodynamic performance of the blade but has some influence on the aero-noise of the blade. The aero-noise of the airfoil can be reduced at angles of attack of 4°, 8°, 11°, and 15°, but the influence of different phase angles of the airfoil on the amplitude of the sound pressure level (SPL) varies. The aero-noise of the airfoil with the NLPS decreases by 16% and 8% at angles of attack of 4° and 8°, respectively. In general, the design of the NLPS reaches the desired requirements, but it still needs to be further optimized in combination with the blade manufacturing process.

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Lightning incidence on wind turbines in winter

Cited by 15 publications

References 4 publications

Upward and downward lightning observed at Tokyo Skytree

Upward and downward lightning observed at Tokyo Skytree

Experimental Study on Lightning Attachment Manner to Wind Turbine Blades With Lightning Protection System

Experimental and Numerical Analysis of the Effect of a New Lightning Protection System on Lightning Protection and Aerodynamic Noise Performance of Wind Turbine Blades

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