EMI in tunnels is the result of which phenomenon?

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Multiple Choice

EMI in tunnels is the result of which phenomenon?

Unbalanced electromagnetic fields are the primary source of EMI in tunnels. In traction power systems and tunnel installations, currents don’t always distribute evenly across conductors and return paths, so the resulting time-varying magnetic field around cables and equipment is uneven. This unbalanced field can radiate and couple into nearby telecom cables and devices, creating interference. Coupling describes how those fields transfer to other conductors, and susceptibility refers to how vulnerable the telecom gear is to that interference; both influence the severity, but they are not the root cause. Therefore, the main phenomenon producing EMI in tunnels is the presence of unbalanced electromagnetic fields.

Unbalanced electromagnetic fields are the primary source of EMI in tunnels. In traction power systems and tunnel installations, currents don’t always distribute evenly across conductors and return paths, so the resulting time-varying magnetic field around cables and equipment is uneven. This unbalanced field can radiate and couple into nearby telecom cables and devices, creating interference. Coupling describes how those fields transfer to other conductors, and susceptibility refers to how vulnerable the telecom gear is to that interference; both influence the severity, but they are not the root cause. Therefore, the main phenomenon producing EMI in tunnels is the presence of unbalanced electromagnetic fields.

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