The importance of the zero line in the power supply system - Database & Sql Blog Articles

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The neutral wire plays a crucial role in power supply systems. Let me break it down for you:

1. It serves as the return path for single-phase 220V devices, ensuring proper operation of household appliances and equipment.

2. In systems with a protective earth (PE) connection, if a fault occurs, the low impedance of the neutral line allows a large short-circuit current to flow, which quickly triggers the circuit breaker or fuse, cutting off the power supply. If the neutral wire is disconnected, the connected equipment may become energized, posing a serious safety risk.

3. When three-phase loads are unbalanced, the neutral wire carries the unbalanced current back to the transformer's neutral point. This helps maintain balanced phase voltages at 220V, while the line voltage remains at 380V. However, if the neutral wire breaks, the two phases can be connected in series, leading to uneven voltage distribution. This can cause some appliances to underperform due to low voltage, while others might be damaged by excessive voltage.

Understanding the function of the neutral wire is essential for safe and efficient electrical system design. If you have any more questions or need further clarification, feel free to ask!