Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1986-11-25
1988-06-21
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
174 3, 174 4R, 361222, 361231, H02H 902
Patent
active
047528540
ABSTRACT:
A method and apparatus is provided for protecting against lightning. An atmospheric potential tapping member is disposed for this purpose in the atmospheric field prone to lightning to collect a voltage (U.sub.c) which, before there is a real threat of the lightning striking, has a value which remains within a lower voltage range (U.sub.b) a capacitor is progressively charged with the voltage U.sub.c and a few tens of microseconds before there is a real threat of the lightning striking a given place, the atmospheric field will undergo a sudden increase and will therefore influence, relatively in the same way, the voltage collected which will rise up to and into a range (U.sub.h) of voltages greater than that (U.sub.b) where it was situated up to then. This potential gradient is detected with respect to time, and the evolution of the potential gradient (dv/dt) detected with respect to time is monitored in this upper range (U.sub.h) of voltages.
When the potential gradient detected with respect to time rises beyond a predetermined threshold, the capacitor is caused to discharge into a discharge circuit.
REFERENCES:
patent: 4480146 (1984-10-01), Invernizzi
patent: 4565900 (1986-01-01), Arnau
Boilloz Pascal
Lambin Bernard
Lefort Louis
Lefort Monique
Deboer Todd E.
Indelec Sarl
Pellinen A. D.
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