What would be the consequences if the phase sequence of the three-phase common-mode inductance is reversed?

Reversing the phase sequence of three-phase common mode inductors (such as incorrect U, V, W phase sequence) can lead to the following consequences:

Decreased common mode suppression capability:

The inductance values of the three-phase windings are designed to match the phase sequence. Reversing the sequence can cause asymmetric inductance in each phase, leading to an imbalance in the distribution of common mode interference among the three phases and a reduction in suppression effect (typically by 10-20dB).

Introduction of differential mode interference:

An incorrect phase sequence can cause imbalance in the three-phase current, generating additional differential mode components. When these differential mode currents flow through the common mode inductor, they can lead to incomplete cancellation of magnetic flux in the core, potentially causing core saturation and system stability issues. Long-term operation may result in excessive temperature rise of the inductor (increased copper loss), which may even affect the normal operation of three-phase equipment (such as motors and inverters), leading to abnormalities such as vibration and noise.