The reason for the three-phase four-wire zero line is charged! Practical motor control circuit wiring diagram - Database & Sql Blog Articles

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1. This occurs when the neutral wire is broken or the neutral wire joint is loose or the oxidation contact is poor. The inspection method is very simple, as long as the electric pen is used to check the power supply, and when the electric pen is not lit, the fault point is found.
2. When the load is unbalanced, there is current on the N line. The electromagnetic induction voltage exists in the wire and the surrounding. In the case of wet and dense lines, the induced voltage can reach 150V or higher, but the energy of this voltage is very small. It automatically disappears after loading
3, three-phase load imbalance hazard, will cause the neutral current is too large, even exceed the maximum phase current, causing serious imbalance, phase and neutral insulation is easy to age first.