Which risk increases if a three-phase power transformer circuit breaker's inrush current limit is set too high?

💡 Explanation

When the inrush current limit is too high, magnetic saturation of the transformer core occurs because the magnetizing inductance drops sharply, leading to excessive flux densities and increased local heating in core and windings. Therefore transformer winding insulation degradation is the key risk, rather than tripping, harmonics, or instability, which involve other conditions.

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