METHOD FOR PRODUCING A GAS-INSULATED ELECTRICAL POWER TRANSMISSION LINE

The invention relates to, inter alia, a method for connecting a first and a second line module (100, 200) to one another, in order to form a gas-insulated electrical power transmission line (400), wherein the first line module (100) comprises a first encapsulating tube (110) and a first electrical inner conductor (120) located in the first encapsulating tube (110), and the second line module (200) comprises a second encapsulating tube (210) and a second electrical inner conductor (220) located in the second encapsulating tube (210), and wherein as part of the method, the first encapsulating tube (110) is connected to the second encapsulating tube (210) and the first inner conductor (120) is connected to the second inner conductor (220). According to the invention a retaining ring insulator unit (300), comprising an outer retaining ring (310) and an insulating element (320) connected to the retaining ring (310) and extending radially inwards from the retaining ring (310), is inserted into the first encapsulating tube (110) from a tube end (101) of the first encapsulating tube (110), and in such a way that a weld pool backing section (311) of the retaining ring (310) abuts in sections with the inner wall (111) of the first encapsulating tube (110) and protrudes in sections out of the first encapsulating tube (110), the second encapsulating tube (210) is pushed onto the weld pool backing section (311) of the retaining ring (310) protruding from the first encapsulating tube (110), and the first encapsulating tube (110), the second encapsulating tube (210) and the retaining ring (310) are welded to one another.