Protection device against pulsed currents

A protection device (1) against pulsed currents intended to transmit signals having frequencies lying within a transmission frequency band, the protection device (1) comprising a signal conduction path and a shielding disposed around the signal conduction path, the signal conduction path comprising:

• two spark gaps (4) mounted in series;
• an inductor element (5) linking a portion of the signal conduction path situated between the two spark gaps (4) to said shielding;
• and
• at least one capacitive element (6) mounted in parallel with one said spark gap (4) on the signal conduction path, wherein said at least one capacitive element (6) comprises a capacitor having plates separated by a dielectric insulator (13);
• such that the protection device (1) is configured as a high-pass filter allowing passage over the signal conduction path of the signals having frequencies lying within the transmission frequency band,
• wherein the signal protection path comprises at least one pair of electrodes, each electrode of the pair of electrodes comprising a first surface and a second surface adjacent to the first surface, wherein the first surfaces of the pair of electrodes are positioned facing one another and said spark gap is mounted between the first surfaces of the pair of electrodes, wherein the second surfaces of the pair of electrodes are situated facing one another and said dielectric insulation being mounted between the second surfaces of the pair of electrodes, in such a way that the second portions of the pair of electrodes form the plates of the capacitor.

A protection device (1) against pulsed currents intended to transmit signals having frequencies lying within a transmission frequency band, the protection device (1) comprising a signal conduction path and a shielding disposed around the signal conduction path, the signal conduction path comprising:

• two spark gaps (4) mounted in series;
• and
• an inductor element (5) linking a portion of the signal conduction path situated between the two spark gaps (4) to said shielding;
• such that the protection device (1) is configured as a high-pass filter allowing passage over the signal conduction path of the signals having frequencies lying within the transmission frequency band, wherein a cut off frequency of the protection device (1) is higher than 1 MHZ, and
• wherein at least one of the two spark gaps (4) comprises:
• an insulating jacket (15) delimiting an inner space and having two apertures respectively at two opposite ends of the inner space;
• two spark-gap electrodes (16) closing the two apertures of the inner space in a gastight manner, each spark-gap electrode comprising an inner part (16a) housed in the inner space of the insulating jacket (15) and an outer part (16b) accessible from the outside of the insulating jacket (15),
• the inner part (16a) having an end surface (17), the end surfaces (17) of said spark-gap electrodes (16) being positioned facing one another so as to delimit between them an air gap (18);
• and
• an inert gas captive in the inner space of the insulating jacket (15).