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Current sensor with a magnetic core

A current sensor and sensor element technology, applied in voltage/current isolation, measuring current/voltage, instruments, etc., can solve the problem that the length cannot be reduced, achieve good coverage and shielding, reduce air gap reluctance, and save energy The effect of space and materials

Inactive Publication Date: 2012-10-24
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the presently known state of the art in current sensor design, the reduction in reluctance is limited to cores with only small core cross-sectional areas, because the length of the air gap cannot be reduced below the required The minimum thickness of the flux sensor element, and the sensor requires a certain minimum lateral dimension, which means that the flux sensor element may not be adequately shielded by the core, and will even protrude from the air gap to be exposed to Interference from external stray fields

Method used

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  • Current sensor with a magnetic core
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  • Current sensor with a magnetic core

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Embodiment Construction

[0048] Figure 1 to Figure 6 Components with the same function and mode of operation are denoted by the same reference numerals.

[0049] figure 1 A magnetic core design 1 known in the prior art for a closed loop current sensor is briefly shown. The current sensor is based on a magnetic circuit comprising a magnetic core 1 of highly permeable material. The magnetic core 1 surrounds a main conductor, represented here by a circle 2 with a cross shape, which carries the current to be measured. The magnetic core has a substantially rectangular form with rounded corners. Apart from the small air gap 3 , the core has a closed circular shape, so it can be described as a toroidal core 1 . The ring shape of the core defines the plane 4 in which the ring core 1 lies. The cross in the circle 2 indicates the direction perpendicular to the plane 4 of the ring core 1 . The direction perpendicular to the plane 4 is called the axial direction of the ring core.

[0050] In the figures, ...

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Abstract

The invention relates to a current sensor, with a ring-shaped magnetic core, said core enclosing the primary conductor (2) with the current to be measured, said core having an air-gap, said air-gap containing a sensor element for measuring the magnetic core induction, whereby the cross-sectional area of the air-gap is larger than the cross-sectional area of the core.

Description

technical field [0001] The invention relates to a current sensor with a toroidal core surrounding a main conductor with a current to be measured and having an air gap containing a sensor element for measuring the Electromagnetic induction of the magnetic core. Background technique [0002] In particular, the present invention relates to current sensors of both open-loop and closed-loop types capable of measuring alternating current (AC) and direct current (DC). These sensors are characterized by having a soft magnetic toroidal core surrounding a main conductor with the current to be measured. The core is usually constructed of a tape wound metal tape, stacked magnet sheets, or bulk ferrite. The magnetic core also has air gaps arranged along the circumferential direction of the magnetic core. figure 1 This arrangement according to known prior art is shown diagrammatically. Toroidal means that the magnetic core has a circumferentially almost closed shape, except for the ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/20
CPCG01R15/183G01R15/207
Inventor 罗尔夫·迪赛恩柯特尔阿德里安·霍佐伊
Owner ABB (SCHWEIZ) AG