Field Distribution in Shielding Case from Space Electromagnetic Interference during Switching Operation in Substation

Transient electromagnetic field generated by switching operations in substations is one of the main sources of electromagnetic interference in substations. In order to ensure the normal operation of secondary equipment, an electromagnetic shield is often required. In this paper, a model is established by using electromagnetic simulation analysis software to analyze the influence of the position change of the disturbance source, the size and number of openings in the shield, and the materials constituting the shield on the electric field inside the shield. The results show that: in the short range, the farther the disturbance source is from the horizontal distance of the shield, the better the shielding effect of the shield; the smaller and more the number of openings in the shield, the lower the electric field inside the shield. The larger the relative permittivity of the insulating material, the stronger the insulating ability, and the better the shielding effect of the electromagnetic field.