A kind of voltage transformer and its shielding case

Abstract

The invention relates to a voltage transformer and a shielding case thereof. The shielding cover comprises two arc-shaped pieces which are oppositely combined into a ring shape and used for being fixed to an outer side of a primary winding of the voltage transformer in an embracing mode, wherein an opening is formed in a radial outer side of each arc-shaped piece, connecting blocks are fixed to the positions, at bottoms of the openings, of two ends of each arc-shaped piece respectively, opposite ends of the two arc-shaped pieces are fixedly connected through a bolt and are mutually conductive,the size of the opening meets the requirement of operating the bolt, the bolt is immersed in the opening, a through hole is formed in one of the two connecting blocks at the end corresponding to a nut of the bolt, a threaded hole matched with the bolt is formed in the other connecting block, and the bolt can be installed in the opening of the arc-shaped piece provided with the through hole, penetrates through the through hole and is in threaded connection with the threaded hole. After the two arc-shaped pieces are fixedly connected through the bolt, an electric field on the shielding cover can be uniformly distributed without additionally arranging a shielding pipe, so assembly efficiency of the voltage transformer is improved, and the cost of the voltage transformer is reduced.

Description

technical field [0001] The invention relates to a voltage transformer, and also relates to a shielding cover for the voltage transformer. Background technique [0002] The primary winding of sulfur hexafluoride gas-insulated voltage transformer products needs to be equipped with a high-voltage shielding cover to shield the high-voltage electric field. At the same time, the starting end of the primary winding lead wire needs to be conductively connected to the center conductor of the pot insulator through the high-voltage shielding cover. And connected to the primary end of the line through the center conductor. [0003] In order to meet the structural requirements of voltage transformers and improve assembly efficiency, a utility model patent with the authorized announcement number of CN201601013U and the authorized announcement date of 2010.10.06 discloses a shielding cover, which is composed of two circular arcs that form a ring structure It is composed of two arc-shaped ...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned connecting plate protrudes from the outside of the shielding cover, which seriously affects the distribution of the electric field on the shielding cover and poses a safety hazard. In actual use, it is necessary to install a shielding tube outside the connecting plate to even out the electric field. When assembling the voltage transformer, it is necessary to pass The two connecting plates are fixedly connected by bolts, and then a shielding tube is installed at the connecting plate. The setting of the shielding tube reduces the assembly efficiency of the voltage transformer and increases the cost of the voltage transformer

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