Open-type current transformer and manufacturing method thereof

Abstract

The invention relates to an open-type current transformer and a manufacturing method thereof. The open-type current transformer comprises a shell and annular iron cores, wherein the shell comprises an upper shell body and a lower shell body, the upper shell body and the lower shell body are movably connected, the iron cores comprise an upper iron core accommodated in the upper shell body and a lower iron core accommodated in the lower shell body, a secondary winding is wound on the lower iron core, and a compensation winding is arranged on the upper iron core. According to the open-type current transformer, the compensation winding is arranged on the upper iron core without the secondary winding to compensate the secondary winding, so that various parameters of the secondary winding meet parameter requirements, the yield of products is improved, the requirements on iron core materials are reduced, the wire consumption of the secondary winding is reduced, the production efficiency is multiplied, and therefore, the production cost is greatly reduced, and very obvious economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an open current transformer and a manufacturing method thereof. Background technique [0002] Current current transformers are mainly divided into closed-loop current transformers and open-loop current transformers according to applications. The closed-loop current transformer needs to be installed in advance when installing the power distribution circuit, and the cable passes through the core hole of the transformer, and then connected to the power distribution circuit. The open-loop current transformer can be installed in the existing power distribution circuit, that is, it can be installed without changing or power off, which is convenient and labor-saving, and has been more and more widely used in recent years. However, open-type (open-loop) current transformers need to disconnect the magnetic circuit in structure, and the magnetic flux leakage is larger than that of tr...

AI Technical Summary

Problems solved by technology

However, open-type (open-loop) current transformers need to disconnect the magnetic circuit in structure, and the magnetic flux leakage is larger than that of traditional closed-loop current transformers, so it is difficult to achieve the same accuracy level.

In particular, it is very difficult to achieve high precision for open-type current transformers with small transformation ratios, and it is even impossible to produce them.

[0003] Generally, in order to achieve higher precision for open-type current transformers, it is necessary to use soft magnetic materials with high magnetic permeability, increase the cross-sectional area of ​​the iron core and reduce the internal resistance of the secondary winding, and adopt a very high production process, which will greatly Increase the cost of the product, and cannot guarantee a high pass rate of the product

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