Magnetic Shielding Effectiveness of Current Comparator

Shao, Haiming; Qu, Kaifeng; Lin, Feipeng; Liang, Bo; Jia, Kai; Ren, Qiang; Li, Yanqiang; Li, Wenfeng

doi:10.1109/tim.2012.2228751

Cited by 10 publications

(1 citation statement)

References 6 publications

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“…Electromagnetic shielding technology proves to be an effective means of suppressing electromagnetic noise propagation within the spatial confines of the substation. The underlying principle involves severing the propagation path between the noise source and the sensor [ 21 , 22 , 23 , 24 ]. Electromagnetic shielding encompasses three main types: electric field shielding, magnetic field shielding, and electromagnetic field shielding.…”

Section: Residual Current Measurement and Magnetic Shieldingmentioning

confidence: 99%

Research on Residual-Current Measurement System of Substation Considering Magnetic Shielding Effect

Tian,

Xu,

Yang

et al. 2024

Sensors

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Residual current is an important monitoring quantity of a power system, and a current sensor plays an important role in detecting current. The substation environment is complex. In addition to the power frequency signal, residual current also has AC and DC components. But it is also affected by the stray magnetic field of the substation. Therefore, the accuracy of the current sensor demands higher requirements. The tunnel magnetoresistive sensor has the advantages of a stable operation, high efficiency, and energy saving, but it is easily affected by the external stray magnetic field during measurements, resulting in a large error. Therefore, this paper proposes a residual-current sensing monitoring system considering the magnetic shielding effect. The root mean square error of the magnetic shielding structure is only 0.572 mA, which can effectively reduce the influence of the external magnetic field and improve the detection accuracy. At the same time, the DC measurement error is less than 1%, the AC measurement error is less than 5%, and the hybrid AC/DC error is less than 8%. It has good response ability and can accurately detect residual current.

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