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

Author:

Tian Jinhu1,Xu Yu1,Yang Yang2,Zhao Yingchun1,Man Wei3,Wang Jingang3ORCID

Affiliation:

1. State Grid Chongqing Electric Power Company Ultra High Voltage Branch, Chongqing 400039, China

2. State Grid Chongqing Electric Power Company, Chongqing 400015, China

3. State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China

Abstract

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.

Funder

Science and Technology Projects of State Grid Chongqing Electric Power Company Ultra High Voltage Branch

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

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