Gas-filled spark gap with high follow current extinction capacity

A gas-filled spark gap for the protection of an electrical installation, including:

• a casing delimiting an internal space, the casing being gastight;
• two elongate electrodes along a propagation trajectory and housed in the internal space, the two elongate electrodes delimiting between them an inter-electrode space, the two elongate electrodes being arranged in such a manner that the inter-electrode space includes successively, along the propagation trajectory, a striking chamber situated between first portions of the two elongate electrodes to strike an electrical arc between the first portions of the two elongate electrodes and an arc-extinguishing chamber situated between second portions of the two elongate electrodes to extinguish the electrical arc, an isolation distance being defined as a shortest distance between the two elongate electrodes in a plane transverse to the propagation trajectory, the isolation distance between the second portions of the two elongate electrodes being greater than the isolation distance between the first portions of the two elongate electrodes, the arc-extinguishing chamber including mutually spaced divider plates distributed between the second portions of the two elongate electrodes;
• two connecting terminals accessible from outside the casing and intended to enable electrical connection of the gas-filled spark gap to the electrical installation, the two connecting terminals being respectively electrically connected to the two elongate electrodes;
• an inert gas trapped in the internal space of the casing;
• and
• wherein the casing includes an insulating base and an insulating lid connected in gastight manner, the sealed connection between the insulating base and the insulating lid being made by solder.

A gas-filled spark gap for the protection of an electrical installation, including:

• a casing delimiting an internal space, the casing being gastight;
• two elongate electrodes along a propagation trajectory and housed in the internal space, the two elongate electrodes delimiting between them an inter-electrode space, the two elongate electrodes being arranged in such a manner that the inter-electrode space includes successively, along the propagation trajectory, a striking chamber situated between first portions of the two elongate electrodes to strike an electrical arc between the first portions of the two elongate electrodes and an arc-extinguishing chamber situated between second portions of the two elongate electrodes to extinguish the electrical arc, an isolation distance being defined as a shortest distance between the two elongate electrodes in a plane transverse to the propagation trajectory, the isolation distance between the second portions of the two elongate electrodes being greater than the isolation distance between the first portions of the two elongate electrodes, the arc-extinguishing chamber including mutually spaced divider plates distributed between the second portions of the two elongate electrodes;
• two connecting terminals accessible from outside the casing and intended to enable electrical connection of the gas-filled spark gap to the electrical installation, the two connecting terminals being respectively electrically connected to the two elongate electrodes;
• an inert gas trapped in the internal space of the casing;
• and
• wherein the inert gas includes dihydrogen.