High voltage electric power switch with anti-flashover nozzle

A high-voltage electric power switch comprising a dielectric gas canister housing a contactor, comprising:

• a pin contact and a socket contact movable during an opening stroke from a closed position in which the pin contact is electrically in contact with the socket contact to an open position in which the pin contact is electrically separated from the socket contact, and movable during a closing stroke from the open position to the closed position, creating an arc gap between the pin contact and the socket contact during the opening and closing strokes;
• a nozzle configured to force a dielectric gas into the gap during the opening and closing strokes comprising a nozzle receiver on a distal portion of the nozzle;
• a nozzle casing forming an abutment between the nozzle receiver and the nozzle casing;
• a corona ring comprising a smooth, non-perforated proximal face positioned at a proximal end of the nozzle casing to suppress flashover at the proximal end of the nozzle casing;
• the corona ring forming an elongated gap between the corona ring and the nozzle;
• a clamp ring creating a seal between the nozzle and the nozzle casing located to a distal side of the abutment;
• and
• wherein, a distance across the gap is greater than a thickness of a wall of the nozzle along a proximal portion of the gap to suppress flashover at the proximal end of the nozzle casing.