Patent · US Active

Current transformer cores formed from magnetic iron-based alloy including final crystalline particles and method for producing same

US7861403B2 · kind B2 · utility

0Cited by

9References

22Claims

0Family size

Assignee

Vacuumschmelze GmbH & Co. KG · DE

Inventors

Wulf Guenther · Maintal, DE
Detlef Otte · Gelnhausen, DE
Joerg Petzold · Alzenau, DE

Key dates

Filing date	Oct 23, 2007
Grant date	Jan 4, 2011
Priority date	—
Expiry date	Dec 23, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49078
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A current transformer core has a ratio of the core outside diameter Da to the core inside diameter Di of <1.5, a saturation magnetostriction λs of =|4| ppm, a circular hysteresis loop with 0.50=Br/Bs=0.85 and an Hcmax=20 mA/cm. The current transformer core is made of a soft magnetic iron alloy in which at least 50% of the alloy structure is occupied by fine-crystalline particles with an average particle size of 100 nm or less, and the iron-based alloy comprises, in essence, one combination.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.