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WG C4.36 Winter Lightning – Parameters and Engineering Consequences for Wind Turbines

Background :

Winter lightning has attracted a great amount of attention, since the damages to wind turbine blades experienced along the Japanese west coast are linked to this phenomenon. Based on a review of available literature on the topic, the wind turbines experiencing damage in Japan mainly fail due to the following three reasons. (1) The interception effectiveness is low, i.e. many of the strikes miss the air termination: (2) the lightning environment is more severe than general lightning environment: (3) the frequency of lightning occurrence is considerably higher than other parts of the world, such that scheduled maintenance and service intervals need to be revised. It is crucial that lightning engineers and scientists understand different lightning environments and adopt reasonable approaches on them.

 Scope :

1. Identify the regions of the world where winter lightning plays a significant role in the necessary lightning protection measures for wind turbines.

2. Identify valid probability distributions of the different lightning strike parameters; peak current, specific energy, charge, duration etc. for the winter lightning phenomena, based on existing data and new measurements.

3. Identify and describe the winter lightning phenomena in engineering terms with the aim of providing an optimum base for defining good lightning protection principles.

4. Identify how the phenomenology of winter lightning should be reflected in standards for lightning protection of wind turbines or aircrafts. Output of the Working Group is expected to have influence on future revisions of IEC and SAE documents.

5. Evaluate how to improve existing verification tests for lightning protection of wind turbines and aircrafts and seek implementation of the revised test methodologies in relevant standardization committees.

6. Define test methods representing life time exposure and aging, since the wearing due to the charge impact is one of the major differences from ‘traditional’ lightning strike exposure.

Deliverables :

Report to be published in technical brochure with summary in Electra

Convener:Masaru Ishii

 

Progress Report 2014 (pptx, 139kB)

Progress Report 2015 (pptx, 102kB)

Progress Report 2016 (pptx, 100kB)