Lightning hardened tether cable and an aerostat tethered to a mooring system therewith

摘要

An improved tether having a central strength member comprised of layers of synthetic fibers surrounded by a thin weatherproof plastic barrier. A current carrying metallic braid surrounds the weatherproof barrier and in a portion of the tether is of a higher strength and denser weave copper than in other areas. An outer protective jacket surrounds the metallic braid and one or more windows are formed by removing a short longitudinal section of the outer jacket above an area of the tether which has the high density metallic braid. The weatherproof barrier, at least in the area where windows are formed, is heat sealed to form a seamless barrier. A relatively soft copper wire is wound around the metallic braid in the window area so as to transfer lightning induced currents in the metallic braid of the tether to a grounding system. The tether may be used in conjunction with an aerostat with the mooring system for the aerostat including a flying sheave which contacts one or more of the windows formed in the tether to complete the discharge path to a ground rod electrically connected to the mooring system.