Voltage transformer with high-voltage shielding and low-voltage shielding functions

Abstract

The invention discloses a voltage transformer with high-voltage shielding and low-voltage shielding functions. The voltage transformer comprises an insulator, a primary high-voltage terminal, a high-voltage shielding body, a shielding ring and a metallic conductor, wherein the primary high-voltage terminal, the high-voltage shielding body, the shielding ring and the metallic conductor are arrangedin the insulator; a high-voltage cable plug, the high-voltage shielding body and an original cavity where the primary high-voltage terminal is located form a closed cavity, and a high-voltage electric field of the primary high-voltage terminal is effectively shielded, so that the field intensity in the primary high-voltage terminal is more uniform, and the magnitude of partial discharge is reduced; the metallic conductor is sprayed on the surface of the insulator, the shielding ring and the metallic conductor are connected to form low-voltage shielding, so that the voltage of the surface of the voltage transformer approaches zero, it is achieved that a high-voltage electric field of a primary coil of the voltage transformer is uniformly shielded in the metallic conductor, and the surfaceof the voltage transformer can be contacted safely, thereby ensuring that the voltage transformer can run safely.

Description

technical field [0001] The invention relates to the technical field of voltage transformer manufacturing, in particular to a voltage transformer with high-voltage shielding and low-voltage shielding. Background technique [0002] At present, in the transformer industry, elbow seat voltage transformers generally adopt the production method of fixing the primary insert casting resin, the primary terminal is conical, the built-in fuse is sealed, and the surface is sprayed with a layer of semi-conductive paint. There are imperfections in the process. On the one hand, the distribution of field strength in the primary high-voltage terminal of the voltage transformer is very uneven, mainly manifested in the excessive concentration of the electric field strength and the high field strength of the primary high-voltage terminal. On the other hand, the surface is sprayed with a layer of semi-conductive paint. , easy to spray unevenly and rough in appearance, mainly manifested in the fa...

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Problems solved by technology

[0002] At present, in the transformer industry, elbow seat voltage transformers generally adopt the production method of fixing the primary insert casting resin, the primary terminal is conical, the built-in fuse is sealed, and the surface is sprayed with a layer of semi-conductive paint. There are imperfections in the process. On the one hand, the distribution of field strength in the primary high-voltage terminal of the voltage transformer is very uneven, mainly manifested in the excessive concentration of the electric field strength and the high field strength of the primary high-voltage terminal. On the other hand, the surface is sprayed with a layer of semi-conductive paint. , easy to spray unevenly and rough in appearance, mainly manifested in the fact that the surface of the transformer is easily damaged and locally charged, and dare not touch it directly, etc.

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