Anti-Magnetic Field Interference Analysis and Shielding Structure Design of Electromagnetic Residual Current Circuit Breaker
Li Kui1,2, Li Changyu3, Niu Feng1,2, Luo Chen1,2, Wu Yi2
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China; 2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China; 3. State Grid Tianjin Electric Power Corporation Chengxi Power Supply Company Tianjin 300190 China
Abstract:Residual current circuit breaker (RCCB) is an important protective device in low-voltage distribution system, which is mainly used to prevent leakage accidents and protect the personal safety. When the RCCB is disturbed by external magnetic field, it will cause the change of the leakage protection working characteristics or even damage. By analyzing the operating characteristics of RCCB, it is found that the magnetic release is most sensitive to the external magnetic field, and the external magnetic field parallel to the direction of magnetic circuit plane of magnetic release has the greatest impact on it. The optimal design of internal conductor structure of RCCB was carried out. When the conductor and the magnetic circuit of magnetic release in the same plane, the magnetic field generated by conductor has the least impact on magnetic release. A shielding of magnetic release to resist the magnetic field interference was designed, and the influence of different materials and structures on shielding effect was analyzed. By optimizing the internal wiring form and installing the shielding, the influence of external magnetic field and load current on RCCB was effectively reduced, and the ability to resist the interference of spatial magnetic field was improved, which verified by experiments.
李奎, 李常宇, 牛峰, 罗晨, 武一. 电磁式漏电断路器的空间磁场抗扰分析及屏蔽结构设计[J]. 电工技术学报, 2022, 37(9): 2161-2169.
Li Kui, Li Changyu, Niu Feng, Luo Chen, Wu Yi. Anti-Magnetic Field Interference Analysis and Shielding Structure Design of Electromagnetic Residual Current Circuit Breaker. Transactions of China Electrotechnical Society, 2022, 37(9): 2161-2169.
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