US 12,492,766 B2
Method for sealing a junction having a contact surface and a counter-contact surface of an element of a compartment of a gas-insulated substation, and resulting junction
Fabrice Durand, Bron (FR)
Assigned to RTE RESEAU DE TRANSPORT D'ELECTRICITE, Paris la Défense (FR)
Appl. No. 18/708,482
Filed by RTE RESEAU DE TRANSPORT D'ELECTRICITE, Paris la Défense (FR)
PCT Filed Nov. 24, 2022, PCT No. PCT/IB2022/061393
§ 371(c)(1), (2) Date May 8, 2024,
PCT Pub. No. WO2023/095056, PCT Pub. Date Jun. 1, 2023.
Claims priority of application No. 21306656 (EP), filed on Nov. 29, 2021.
Prior Publication US 2025/0003535 A1, Jan. 2, 2025
Int. Cl. F16L 23/16 (2006.01); H02B 13/045 (2006.01)
CPC F16L 23/165 (2013.01) [H02B 13/045 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for sealing a junction with a contact surface and counter-contact surface of an element of a compartment of a gas-insulating substation, said junction comprising two mechanical seals clamped between the contact surface and the counter-contact surface, arranged so as to form a closed inter-seal volume delimited by both of the two mechanical seals and by the contact surface and counter-contact surface, the method for sealing comprising an injection of a sealing product into the inter-seal volume using a leakage recovery duct arranged in a thickness of the compartment, this duct opening into the inter-seal volume, wherein:
during said injection, the sealing product is in the form of a liquid whose kinematic viscosity, measured at 40° C. under 1 atm, is greater than or equal to 3000 mm2/s; and
the injection is carried out under pressure by a plurality of successive increases in injection pressure until any residual gas is expelled from the inter-seal volume by pressurized leakage of said residual gas via at least one of the two mechanical seals.