In an electrical power supply,why if neutral phase of a 3phase supply fail over

In an electrical power supply,why if neutral phase of a 3phase supply fail over current occur but if it's single phase supply neutral phase fail low current occur?

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In an electrical power supply,why if neutral phase of a 3phase supply fail over current occur but if..

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What happens to KVA reading of a three phase meter when you reverse CT wires on phase A and C

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