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Current transformer having an amorphous fe-based core

A technology of current transformers and inductors, applied in the field of transformers, can solve the problems of limiting the maximum current value and expensive alloys

Inactive Publication Date: 2005-06-22
METGLAS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-rich amorphous alloys typically have a saturation induction below about 10 kG or 1 Tesla, which limits the maximum current value that can be measured
Besides, these alloys are expensive due to the large amount of Co used to form the alloys.

Method used

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  • Current transformer having an amorphous fe-based core
  • Current transformer having an amorphous fe-based core
  • Current transformer having an amorphous fe-based core

Examples

Experimental program
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Embodiment Construction

[0015] An iron-based amorphous alloy ribbon is wound in a ring shape to form a magnetic core. The core is then heat treated in a furnace with and without a magnetic field. The cores were then tested with a commercially available BH hysteresis loop recorder to determine the linear B-H relationship, where B and H represent magnetic induction and magnetic field, respectively. The iron-based amorphous alloy ribbon is produced by quenching the melt and has a composition consisting essentially of about 70-87 at. % iron and about 13-30 at. Atomic % of iron is replaced by cobalt, up to 3 atomic % of iron is replaced by nickel, manganese, vanadium, titanium or molybdenum.

[0016] figure 1 Comparing the amorphous Fe-based core according to the present invention with the Co-based core of the prior art, the amorphous Fe-based core of the present invention was heat-treated at 400° C. for 10 hours under a magnetic field of 200 applied perpendicular to the circumferential direction of the...

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Abstract

Provided is a magnetic core having a ring structure formed by winding iron-based amorphous metal ribbons. Thereafter, the core is heat-treated to obtain linear B-H characteristics. Beneficially, the linear B-H characteristic does not vary with the value of the applied magnetic field and the frequency used. Due to this characteristic, the core is especially suitable for use in current transformers.

Description

technical field [0001] The present invention relates to transformers for power distribution systems, power supplies, electromagnetic machines, etc., and more particularly to current transformers for accurate measurement of current in which the core material is linearly related to the excitation level. Background technique [0002] Directly measuring the current flowing through a conductive medium such as copper wire, especially when the current and voltage in the medium are high, is not a simple matter. Direct measurement methods include conventional watt-hour meters based on eddy currents generated by current flow, shunts using precision resistors in their low current flow sections, and magnetic flux meters that detect changes in the magnetic field produced by current flow. All of these techniques have drawbacks. For example, eddy currents, which are the basis of conventional watt-hour meters, are less accurate especially if the current to be measured contains harmonics of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/28H01F1/153H01F17/00H01F27/02H01F27/24H01F27/29H01F38/28
CPCH01F1/15308H01F27/25H01F38/28H01F1/153
Inventor R·J·马蒂斯S·V·塔蒂科拉R·哈塞加瓦
Owner METGLAS INC