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A current transformer including a low permeability shunt anda trip device employing the same

A technology for current transformers and tripping devices, applied in the field of tripping devices and current transformers, can solve problems such as current dissipation

Active Publication Date: 2008-11-26
EATON INTELLIGENT POWER LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unsatisfactorily, this excess current must be dissipated by current transformer 70 or other means (not shown)

Method used

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  • A current transformer including a low permeability shunt anda trip device employing the same
  • A current transformer including a low permeability shunt anda trip device employing the same
  • A current transformer including a low permeability shunt anda trip device employing the same

Examples

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Embodiment Construction

[0017] Directional terms as used herein—such as left, right, clockwise, counterclockwise, top, bottom, up, down—and their derivatives refer to the orientation of elements shown in the drawings and do not limit the claims unless clearly stated.

[0018] As used herein, the term "plurality" means one or more than one.

[0019] As used herein, the statement that two or more elements are "connected" or "coupled" means that the elements are joined together either directly or through one or more intervening elements. Additionally, as used herein, the statement that two or more components are "attached" means that the components are directly joined together.

[0020] image 3 and 4 A current transformer 10 comprising a core 12 , a coil 14 and a shunt element 16 is shown. Two or more electrical leads 24 are structured to electrically connect the coil 14 to an external circuit, such as a trip device circuit (not shown). In the present example, the core 12 is formed from a pluralit...

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PUM

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Abstract

A current transformer (10) comprises a coil (14), a core (12) and a shunt member (16). The core forms a magnetic circuit and has a first permeability. At least a portion of the core is encircled by the coil. The shunt member is coupled to the core and has a second permeability. The shunt member is continuous and forms a magnetically parallel path with the at least a portion of the core encircled by the coil. The current transformer may be incorporated into a trip device.

Description

technical field [0001] This invention relates generally to electrical transformers, and more particularly to current transformers. The invention also relates to tripping devices comprising one or more current transformers. Background technique [0002] Trip devices are often used to protect the primary conductors of power circuits. A trip device typically includes a trip circuit and a plurality of current transformers. The current transformer may supply power to the trip circuit and / or provide a signal to the trip circuit corresponding to the amount of current flowing in the primary conductor. The current transformer interfaces with the primary conductor of the power circuit and transforms the relatively high magnitude current flowing in the primary conductor to the relatively low magnitude current used by the associated trip circuit. [0003] figure 1 Is a simplified view of a known current transformer 70 comprising a high permeability core 72 surrounding a conductor 78...

Claims

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Application Information

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IPC IPC(8): H01F38/30H01F3/12H01H7/12
CPCH01F3/12H01F2003/106H01H71/125G01R15/183H01F38/30
Inventor T·J·米勒J·J·马茨科M·A·朱德斯
Owner EATON INTELLIGENT POWER LIMITED