220V and 380V are the standards of AC voltage in China, and the frequency is 50Hz. China adopts three-phase four wire transmission system, that is, three live wires and one neutral wire (zero wire). Then the voltage between any live wire and a zero wire is 220V, and the voltage between two live wires is 380V. China's civil power is generally 220V and industrial power is 380V.
When selecting the voltage of the infrared heating tube, the infrared heating tube is a resistive load. For the voltage of 220V, the current of the heating tube = power / the voltage of 220380V, the current of the heating tube = power / (380 * 1.732). Therefore, under the condition of the same power, the current is small for the 380V heating tube.
There is no national standard for the selection of voltage, but we can consider it according to the design and manufacturing cost. For example, the withstand voltage requirements of electrical components are different due to the different withstand voltage of the two, and the current of 220V and 380V under the same power are also different, so the cost of selecting wires and cables is different. The cost of electrical components is the same. The higher the current, the higher the cost of electrical components. The biggest difference between phase and three-phase lies in the impact on the operation of the power grid. If the single-phase (220V) power is too large, it will cause three-phase imbalance. Three phase imbalance will cause:
1. Increase the power loss of the line.
2. Increase the power loss of distribution transformer.
3. The output of distribution transformer is reduced.
4. The distribution transformer generates zero sequence current.
5. Affect the safe operation of electrical equipment.
Therefore, we should reasonably choose infrared heating tubes, not only 220V and 380V. Our heating tubes can be made into different voltage specifications in different industries and countries.
