Method for manufacturing a core for a current transformer

Patent metadata

Field	Value
Publication number	US-11322300-B2
Application number	US-201716344584-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Oct 27, 2016
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Provided are a core for a current transformer and a manufacturing method for the same in which high permittivity is formed in order to optimize electric power acquisition efficiency by magnetic induction at a low current. The provided method of manufacturing a core through the steps of winding a metal ribbon, heat treating a core base, impregnating, cutting and polishing, wherein after the core base which is inserted into a mold is heat treated to implement a shape, the core base separated from the mold is heat treated to manufacture the core for the current transformer having high permittivity.

First claim

The invention claimed is:

1. A method of manufacturing a core for a current transformer, the method comprising:
winding a metal ribbon to manufacture a core base;
performing a heat treatment on the core base at a set temperature;
impregnating the heat-treated core base into an impregnation solution;
cutting the core base impregnated into the impregnation solution to manufacture the core; and
machining a cut surface of the core through polishing,
wherein the performing of the heat treatment on the core base includes performing a heat treatment on the core base inserted into a mold at a first set temperature, and performing a heat treatment on the core separated from the mold at a second set temperature.

2. The method of claim 1 , wherein the manufacturing of the core base includes winding a nanocrystalline ribbon made of an Fe-based magnetic alloy to manufacture the core base.

3. The method of claim 1 , wherein the performing of the heat treatment on the core base further includes setting a temperature in a range of 530° C. to 540° C. as the first set temperature.

4. The method of claim 1 , wherein the performing of the heat treatment on the core base further includes setting a temperature in a range of 530° C. to 560° C. as the second set temperature.

5. The method of claim 1 , wherein, after the impregnation, magnetic permeability of the core base is formed of 40000 or more.

6. The method of claim 1 , wherein, after the machining of the cut surface, magnetic permeability of the core is formed of 20000 or more.

Assignees

• Amosense Co Ltd

Inventors

• Na Won-San
• Park Jin-Pyo
• Kim Young-Joon
• Ko Jae-Jun
• Tak Su-Hyeoung

Classifications

• H01F41/0206 Primary

  Manufacturing of magnetic cores by mechanical means (magnetic cores per se H01F27/24) · CPC title

• H01F27/24

  Magnetic cores · CPC title

• H01F1/15333

  containing nanocrystallites, e.g. obtained by annealing · CPC title

• H01F27/25

  made from strips or ribbons (H01F27/26 takes precedence) · CPC title

• H01F41/0213 Primary

  Manufacturing of magnetic circuits made from strip(s) or ribbon(s) (magnetic cores made by winding a ribbon H01F27/25) · CPC title