Disassembly and assembly method of oil and gas bushing connecting AC 500kv oil-immersed transformer and gis tubular busbar

Abstract

The invention discloses an oil-gas sleeve disassembling and assembling method for making an alternating-current 500 kV oil-immersed transformer connected with a GIS tubular bus. A supporting frame (1)is built, wood boards (2) are laid, and a height-adjustable support adjusting device (3) is placed to support the GIS tubular bus (4); longitudinal and transverse center line positions of a to-be-replaced old oil-immersed transformer (5) are correspondingly marked on an oil-immersed transformer oil pool wall, and the coordinates of a top point M of the inner side of a flange surface on an oil-gassleeve lifting base are determined; connection points at the two ends of an oil-gas sleeve, an oil-gas sleeve airtight sealing cylinder, other accessories and sleeves are disassembled, and the new oil-immersed transformer is pushed in after the old oil-immersed transformer is pushed out, so that the positions of the longitudinal and transformer center line and the top point M of the new oil-immersed transformer are consistent with those marked before disassembling; the oil-immersed transformer is jacked, and the oil-gas sleeve and the oil-gas sleeve airtight sealing cylinder are installed; byfinely adjusting the support adjusting device, the oil-gas sleeve is precisely matched with the GIS tubular bus and a connector flange of the oil-immersed transformer, and connection bolts at the twoends are tightened. The method can be used for safely, reliably and efficiently disassembling and assembling the oil-gas sleeve.

Description

technical field [0001] The invention relates to the technical field of an oil and gas bushing disassembly method for connecting an AC 500kV oil-immersed transformer and a GIS tubular busbar at a power construction site. Background technique [0002] Oil-gas bushings are widely used in power systems as conversion and connection equipment for different insulation media between oil-immersed transformers and SF6 gas-insulated equipment. One end is immersed in the insulating gas of the SF6 gas insulated equipment, and the other end is immersed in the insulating oil medium of the oil-immersed transformer. The conductor of the SF6 gas insulated combined electrical appliance (GIS for short) is connected to the lead wire of the high voltage side of the oil-immersed transformer through the conductor of the oil-gas bushing to form a complete electrical connection circuit. Oil-gas bushings, GIS and oil-immersed transformers are fully enclosed equipment with outstanding advantages such ...

AI Technical Summary

Problems solved by technology

Using the above method to replace the oil and gas bushing has the following problems: (1) Due to the difficulty of adjusting the oil-immersed transformer of nearly 200 tons, it takes a long time, and the time for the GIS and the oil and gas bushing to be exposed is relatively long; (2) When the oil-immersed transformer is adjusted and docked, it will pose a threat to the gas side air chamber sealing cylinder of the oil-gas bushing, GIS air chamber sealing level equipment, etc.; (3) The stress on the bellows is large, and the sealing performance is reduced, which will affect the service life of the equipment; (4) There is a high risk of accidents in scaffolding. The space between the scaffolding rods is narrow and inconvenient to operate. The horizontal steel pipe supporting the GIS tubular busbar has a large span length and deformation, which is not easy to adjust and control.

Therefore, it takes a lot of manpower, material resources and time to restore the GIS gas chamber, which also brings hidden dangers to equipment insulation safety and low work efficiency

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