This work presents an analysis of the behavior of the electromagnetic field inside a shielded structure (shielded enclosure), when it is submitted to a transient electric current. The shielded structure is used in systems of electrical protection by annulling the electromagnetic field in its interior. A closed structure, made up of a considerable number of interconnected cables, can become a good approach for a Faraday cage. Based on this approach, simulations of the transient electric current in the structure were made. Connected to this was a current source at one of its borders, and grounding the plane of its base. Through the transient of the obtained current, the electromagnetic field, in time domain, applying an expression adequately developed for this end was simulated. Analysis of results for different configurations were made.
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