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Differential detection toroid and device

A toroidal coil and detection device technology, which is applied in the field of differential detection and protection devices, reliability, and toroidal coils for detecting differential currents, can solve problems such as false tripping and bulkiness, and achieve the effect of reducing defects and avoiding false detection

Active Publication Date: 2011-09-28
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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  • Differential detection toroid and device
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  • Differential detection toroid and device

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Embodiment Construction

[0023] The inventors of the present invention have discovered that one reason for the improper formation of the secondary signal involves the proper shape of the detection loop coil 2 . Such as Figure 1B As shown, 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 inclu...

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Abstract

In order to improve the reliability of differential protection and reduce mistrip, a detection toroid is improved. According to the invention, different methods are provided for homogenizing magnetic flux in the toroid (2) at ends (8) of a band (4) made of magnetic material, in particular, a wedge portion (20) and slots (30, 40) are arranged on the end parts (18) of the band (4), for example, on the whole turn (61) on the end parts (18) of the band (4).

Description

technical field [0001] The invention relates to the differential circuit breaker 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 transmission line, the vector sum of the outgoing and incoming currents should be zero. But faults may occur, such as ground faults, and residual differential currents may remain between the line conductors. To detect this current, sometimes referred to as zero-phase or leakage current, it is common to resort to a concentric, coaxial magnetic field emanating from any conductor through which the curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/38H01F5/00H01H83/14H02H3/32
CPCH01F38/30H01H83/144H01F27/34H01F27/25H01H2083/146
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