Distribution network lines play a critical role in reliably delivering electrical power to end-users. However, during operation, these lines are prone to tripping due to faults such as single-phase grounding, lightning strikes, and other transient disturbances, which significantly impact the production and daily lives of nearby enterprises and residents. To address this, it is essential to suppress transient high-frequency signals generated during line faults. This study proposes an electromagnetic shielding device based on circuit resonance principles, leveraging the high-frequency electromagnetic wave shielding properties of ferrite rings. Experimental results demonstrate that both series resonant and parallel resonant circuits effectively suppress high-frequency currents. Notably, the suppression duration of the parallel resonant circuit is approximately three times longer than that of the series resonant circuit.