Which risk increases when an electrical power distribution system operates continuously unbalanced across three phases?

💡 Explanation

When a three-phase electrical system is unbalanced, negative and zero sequence currents circulate because the load distribution is uneven, leading to increased losses and localized heating in transformer windings. Therefore transformer overheating is the primary risk, rather than breaker malfunction, factor issues, or relay desensitisation, which involve distinct protection failures.

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