36 research outputs found
High-speed videos of laboratory leaders emerging from wind turbine blade tips
This paper presents some observation results of the
attachment test of a wind turbine blade as described in the
upgrade of the IEC-61400-24. The optical observations were
performed by means of high-speed video and UV-sensitive
photo camera. This study investigates the effects on the
leaders emerging from the blade comparing three different
air-terminals: discrete receptors, discrete receptors with
diverter strips and metallic tip. In the first two types, salt
mist pollution was applied to the blade. For non polluted
tips positive leaders appeared from receptors towards the
ground avoiding the blade surface. When the blade was
polluted additional leaders emerged moving horizontally.
Moreover, in this situation the leader progressed on the
blade surface. Pollution also produced the inception of more
leaders when the blade was equipped with discrete
receptors and diverter strips.Preprin
Draft IEC 61400-24 wind turbines: lightning protection blades
Wind turbine blades are the most exposed parts of the turbine,
and would experience the full impact from the electric fields as
associated with the lightning attachment process, the lightning currents,
and the magnetic field associated with lightning currents.At some point in time hopes were high that lightning would not strike
blades made of non-conducting material only, but practical experiences
have clearly demonstrated that this is not the case. Lightning does in
fact strike blades without any metallic components, and
whenever a lightning arc is formed inside the blade damage is
severe
Draft IEC 61400-24 wind turbines: lightning protection blades
Wind turbine blades are the most exposed parts of the turbine,
and would experience the full impact from the electric fields as
associated with the lightning attachment process, the lightning currents,
and the magnetic field associated with lightning currents.At some point in time hopes were high that lightning would not strike
blades made of non-conducting material only, but practical experiences
have clearly demonstrated that this is not the case. Lightning does in
fact strike blades without any metallic components, and
whenever a lightning arc is formed inside the blade damage is
severe.Postprint (published version
Research activities on lightning protection of wind turbines by the Spanish group
Postprint (published version
Pararrayos ESE y puntas Franklin, con espíritu de aclaración
Los pararrayos Franklin y los ESE (Early Streamer Emission) parecen competir entre sí, siendo la distancia de cebado el valor que los separa. Con el ánimo de hacer claridad se presenta en este trabajo una revisión de estudios y ensayos
Draft IEC 61400-24 wind turbines: lightning protection blades
Wind turbine blades are the most exposed parts of the turbine,
and would experience the full impact from the electric fields as
associated with the lightning attachment process, the lightning currents,
and the magnetic field associated with lightning currents.At some point in time hopes were high that lightning would not strike
blades made of non-conducting material only, but practical experiences
have clearly demonstrated that this is not the case. Lightning does in
fact strike blades without any metallic components, and
whenever a lightning arc is formed inside the blade damage is
severe