Core for current transformer and manufacturing method for same

Patent metadata

Field	Value
Publication number	US-2020335276-A1
Application number	US-201716344584-A
Country	US
Kind code	A1
Filing date	Oct 24, 2017
Priority date	Oct 27, 2016
Publication date	Oct 22, 2020
Grant date	—

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

1 . A method of manufacturing a core for a current transformer, the method comprising:
winding a metal ribbon to manufacture a core base; performing 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 a core; and machining a cut surface of the core through polishing.

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 includes performing heat treatment on the core base inserted into a mold at a first set temperature.

4 . The method of claim 3 , 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

5 . The method of claim 3 , wherein the performing of the heat treatment on the core base further includes performing heat treatment on the core base separated from the mold at a second set temperature.

6 . The method of claim 5 , 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.

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

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

9 . A core for a current transformer, comprising:
an upper core which is formed such that both ends of a semi-cylindrical-shaped base extend downward and in which an accommodating groove is formed; and a lower core formed such that both ends of a base extend in a direction of the upper core, wherein each of the upper core and the lower core has magnetic permeability of 20000 or more.

10 . The core of claim 9 wherein each of the upper core and the lower core is formed of a nanocrystalline ribbon made of an Fe-based magnetic alloy.

Assignees

• Amosense Co Ltd

Inventors

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

Classifications

• H01F1/15308 Primary

  based on Fe/Ni (H01F1/15325 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

• H01F27/25

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

• H01F1/15333

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

• H01F2038/305

  with toroidal magnetic core · CPC title