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Toroid and differential detection device

A technology of toroidal coil and detection device, applied in the field of reliability, differential detection and protection device, and toroidal coil for detecting differential current, can solve the problems of false tripping and cumbersomeness, and achieve the effect of reducing defects and avoiding false detection.

Active Publication Date: 2008-07-23
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the bulkiness of the first solution and the complexity of the second, these arrangements do not solve all the problems, and the problem of false tripping due to interference with the secondary signal still exists

Method used

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  • Toroid and differential detection device
  • Toroid and differential detection device

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Embodiment Construction

[0023] The inventors of the present invention have discovered that one reason for the insufficient formation of the secondary signal involves the proper shape of the detection loop coil 2 . As shown in FIG. 1B , the magnetic flux B originating from the primary circuit 12 actually follows the layer 6 of the magnetic strip 4 i Flow through the toroidal coil 2. at 6 per turn i There is a very thin air gap in between that slows down the flux B from one layer of the material to the other. Near the inner end 8, flows into the first layer 6 1 The flux B must pass through the second layer 6 2 , resulting in a local flux increase that cannot always be followed by layer 6 i absorbed, resulting in the adjacent layer 6 2 Saturates quickly. This saturation is asymmetrical with respect to the conductor 12 and disturbs the balance of the magnetic field B of the toroidal coil 2 , causing secondary signals to be generated in the coil winding 10 .

[0024] Specifically, for the inclusion...

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Abstract

The toroid (2) has a band made of magnetic material, provided with a constant sensible section and winded in a manner to form a succession of turns. The band has two triangular end parts (18) extended on a predetermined length from ends (8) of the band. Each end part is equipped with a magnetic flow homogenization unit that is formed by a non magnetic shim, a reduction element and a recess for homogenizing magnetic flux to gradually reduce magnetic coupling between the end part and a turn (6-2) towards the ends of the band. An independent claim is also included for a switchgear comprising primary conductors.

Description

technical field [0001] The present invention relates to differential interruption of power distribution equipment, in particular to the reliability of tripping under strong excitation current. [0002] More generally, the invention relates to a toroidal coil for detecting differential currents and to the optimization of the geometry of the toroidal coil in order to reduce the generation of interfering secondary signals. [0003] The invention also relates to a differential detection and protection device that is immune to nuisance tripping. Background technique [0004] For any power line, the vector sum of the outgoing and incoming currents should be zero. Faults, such as ground faults, will occur anyway and residual differential currents may remain between line conductors. To detect this current, sometimes called zero phase or leakage current, one usually resorts to a concentric, coaxial magnetic field emanating from any conductor through which current flows. The power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/38H01F5/00H01H83/14H02H3/32
CPCH01F27/25H01H83/144H01F27/34H01H2083/146H01F38/30
Inventor 布鲁诺·科林塞巴斯蒂安·巴费特帕特里克·马斯克里斯琴·奇利特阿费夫·凯道斯-勒布克
Owner SCHNEIDER ELECTRIC IND SAS