a current transformer

Abstract

The invention relates to current transformer, which comprises a base, wherein a sleeve is fixed to the base, and a cylinder is connected to the upper end of the sleeve; a high potential shield is arranged in the sleeve and is fixedly connected with the cylinder; a grounding pipe is arranged in the sleeve, an intermediate potential shield is arranged between the high potential shield and the grounding pipe, the intermediate potential shield and the grounding pipe are coaxially sleeved, an insulating support for fixedly connecting the intermediate potential shield and the grounding pipe into anassembly is arranged between the intermediate potential shield and the grounding pipe, and the intermediate potential shield is suspended outside the grounding pipe; or the intermediate potential shield and the high potential shield are coaxially sleeved, an insulating support for fixedly connecting the intermediate potential shield and the high potential shield into an assembly is arranged between the intermediate potential shield and the high potential shield, and the insulating support suspends the intermediate potential shield on the inner side of the high potential shield. An operator cancoaxially fix the metal shielding cylinder and the grounding pipe or the high-potential shield conveniently, it is ensured that the intermediate potential shield, the grounding pipe and the high potential shield are coaxial, meanwhile, the assembling operation of the intermediate potential shield is omitted, and the assembling operation of the current transformer is simplified.

Description

technical field [0001] The invention relates to a current transformer. Background technique [0002] The structure of the current transformer in the prior art is as figure 1 As shown, it mainly includes a base 11 , a sleeve 12 and a cylinder 13 , wherein the sleeve 12 is equipped with a high potential shield 14 , an intermediate potential shield 15 and a grounding pipe 16 . The high-potential shield 14 is cylindrical and is set outside the grounding pipe 16. It is generally fixedly connected to the flange at the lower end of the cylinder 13. The lower end of the grounding pipe 16 is fixed on the base 11 by screws through the flange, and the upper end is connected to the cylinder body through a spring contact finger. The shielding cover 17 provided on the lower side of the secondary coil shielding cylinder in 13 is conductively connected. [0003] The intermediate potential shield 15 is set between the high potential shield 14 and the grounding pipe 16. Its structure is an ...

AI Technical Summary

Problems solved by technology

However, in the prior art, the intermediate potential shielding length formed by the butt joint of the shielding cylinder and the insulating cylinder is relatively long. During manufacturing, it is difficult to ensure the perpendicularity between the central axis of the shielding cylinder and the flange at the bottom of the insulating cylinder, and the intermediate potential shielding is slightly Tilting will cause a large horizontal displacement of the upper shielding cylinder, so that the intermediate potential shielding cylinder cannot be coaxial with the high potential shielding and grounding pipe, and the improvement effect of the internal and external electric fields of the current transformer will be deteriorated

At the same time, the high potential shield and the intermediate potential shield are independent parts, and the intermediate potential shield includes the shield and the insulating cylinder, which makes the assembly of the current transformer more troublesome

In addition, during the manufacture of intermediate potential shielding, air bubbles are prone to appear in the bonding part of the insulating cylinder and the shielding cylinder, which may easily cause the partial discharge of the transformer to exceed the standard

Images