[EMC]Coupling Model and Impedance Calculation of the Steel Ground Loops With Proximity Effect

Abstract—This paper focuses on the coupling model and the HoV{Uzm  
coupling impedances between two circuits with a common ground {9Xm<}%u]]  
of a steel plane. By adopting a two-dimensional (2-D) electromagnetic *f?S5.  
model, the influence of the skin and the proximity effects &p)@8HY  
are considered. In the case of a strong proximity effect due to the q>P[nz%  
exterior wires, the distribution of the electromagnetic field inside p&QmIX]BZ  
and outside a steel plane is analyzed, and an equivalent coupling \d ui`F"Cc  
circuitmodel of two circuits with a common steel plane is built. The +#9xA6,AE  
analytical solution of the coupling impedances and its frequency >mew"0Q  
characteristics are calculated based on the proposed model. The solution j7,13,t1-  
is validated by the numerical solutions and the measurement hi0XVC95  
results in the frequency range of 40 Hz–15 M Hz. The influence pqOA/^ar  
of the proximity due to nearby wires is severe in high-frequency {9Db9K^  
situations, and the intern .. :+<t2^)rD  
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