Method and apparatus for lightning protection

B - Operations – Transporting – 63 – B

Patent

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B63B 43/00 (2006.01) H02G 13/00 (2006.01)

Patent

CA 2450469

The subject invention pertains to a method and apparatus for lightning protection. The subject method and apparatus can be utilized to provide lightning protection for a marine vessel, other structures near water, and/or land-based structures. In a specific embodiment of the subject invention, an electrode design for allowing the electric current caused by a lightning strike to be grounded to water can be employed. The subject grounding electrodes can be employed such that the electrodes are not completely immersed in the water during normal operation of the marine vessel. In a specific embodiment of the subject invention, such grounding is not in contact with the water at all. The specific embodiment of the subject electrode is designed to enhance sparking initiation. In a specific embodiment, the subject electrode is designed to be at least partially, and in some embodiments substantially, insulate from the water, such that an area of the electrode used as a spark channel is exposed. In some embodiments, even the spark channel portion is insulated. The subject invention can incorporate an electrode geometry which enhances the local electric field so as to promote a spark connection with the water when sufficient charge accumulates in the lightning protection system. The subject electrode can then be used in place of, or in conjunction with, ground plates.

La présente invention concerne un procédé et dispositif parafoudre plus particulièrement destiné à des navires mais aussi à des structures proches de l'eau et/ou des structures à terre. Selon un mode de réalisation, on dispose d'un modèle d'électrode permettant d'utiliser l'eau comme mise à la terre du parafoudre. Ces électrodes se montent de façon à ne pas être totalement submergées en régime normal du navire. Pour un mode de réalisation particulier, les électrodes ne sont pas en contact avec l'eau. En l'occurrence, ces électrodes conçues pour renforcer l'amorçage de la décharge sont partiellement au moins ou bien sensiblement totalement isolées de l'eau, de façon qu'une surface de l'électrode servant à canaliser la décharge soit apparente. Pour certains modes de réalisation, même le canal de décharge est isolé. L'invention utilise une géométrie d'électrode qui vient renforcer le champ électrique local de façon à favoriser l'interface de décharge avec l'eau dès lors qu'une charge suffisante s'est accumulée dans le système parafoudre. L'électrode de l'invention peut remplacer ou compléter les prises de terre.

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